Production risk and adoption of irrigation technology: evidence from small-scale farmers in Chile
© The Author(s) 2016
Received: 27 March 2015
Accepted: 6 July 2016
Published: 21 July 2016
In most developing countries non-irrigation status often dominates adoption of traditional and modern irrigation technology. In this paper, we study the effect of production risk on irrigation technology choice among small-scale farmers in Chile, applying sample selection and discrete choice models. We find that more educated farmers, with credit access, receiving extension services, and living in communes with more adopters are more likely to use modern irrigation techniques. Moreover, production risk is often associated with adoption of traditional irrigation, and this risk often undermines a shift to more modern irrigation systems. Controlling for pre-conditions that determine irrigation choices clearly improves our understanding of small-scale farmer irrigation adoption decisions and we argue that weaker knowledge about and lower automatic diffusion of modern irrigation is a main obstacle for improving small-scale farmer productivity.
KeywordsProduction risk Irrigation Technology adoption
JEL ClassificationD8 O13 Q15 Q55
Since the green revolution, agriculture in developing countries has experienced a technological transformation process principally driven by an increasing demand for agricultural products. It has triggered a massive increase in the adoption of new technologies, such as the use of chemical inputs, pesticides, traditional irrigation, and high-yielding seed varieties, with significant benefits in terms of productivity and poverty reduction (Evenson and Gollin 2003). However, concerns have lately been raised on the grounds of sustainability, as the intensive use has consequences for environment and human health (Ruttan 2002).
The adoption of traditional irrigation methods has shown to be beneficial to reduce farmers’ vulnerability to weather conditions, making production and incomes more stable. However, traditional irrigation has also increased the pressure on water reservoirs and created pollution problems.1
The aim of this paper is to study the effect of production risk on irrigation technology choices and discuss adoption of modern irrigation in settings where most rural households depend exclusively on rainfall for water supply. This is a particular feature in developing countries and zones characterized by abundance of precipitation.2 We argue that the latter may give rise to potential sample selection problems in irrigation choices, which needs to be considered when analyzing the association between production risk and farm technology adoption. For modeling these irrigation choices, we as an example use agricultural census data of potato family farmers in Chile.
Chile has the challenge to transform the Chilean agricultural sector into a world-wide agricultural production and food powerhouse (MINAGRI 2006). However, such a transformation process requires incorporating small holder family farmers into productive agricultural units not only serving themselves (home-production) but as integrated highly productive active agents contributing to the achievement of this objective. The Agricultural Development Institute (ADI) has continually provided technical support to the family agriculture in areas such as investment in human and productive capital, credit provision, access to markets, recuperation of eroded soil and irrigation. In spite of this effort and progress observed in the last decade, the technological gap between large and small-scale farmers persists. For example, 89 % of total land under modern irrigation systems is held by larger farmers (FAO 2009). This fact is what motivates this study to analyze the factors explaining the slow adoption process among small-scale farmers, where the main focus is on the importance of differences in production risk faced by small versus large farmers.
The association between production risk and adoption of modern irrigation is quite straight forward. Risk-averse farmers may not adopt modern irrigation if it raises production risk by increasing yield variability too much. In contrast, if the new technology has the potential to attenuate variability in economic outcomes, then it would be more rapidly adopted among risk-averse small scale farmers. Even though literature on adoption of modern irrigation technology is well-documented, there is little evidence concerning production risk and irrigation choices. Two exceptions are Koundouri et al. (2006) and Torkamani and Shajari (2008). Both studies find support of a positive and significant effect of production risk on adoption decisions, arguing that new irrigation technology is a risk-decreasing input. However, both studies were carried out in settings where the knowledge of irrigation benefits is well-known and the new technology seems to show some degree of consolidation, which only allow to model changes from traditional to modern irrigation systems.
In Chile the pre-conditions are different. Due to abundance of precipitation mainly in the southern territories in Chile, around 83 % of potato farmers do not use irrigation, which amounts to 66 % of registered farming land. Exploiting these differences in natural pre-conditions, we follow Foudi and Erdlenbruch (2012) applying a sample selection approach to study the risk-decreasing properties of irrigation under joint estimation of production and production risk. However, to our knowledge, no previous studies have extended this approach to the decision of shifting from conventional farming to modern irrigation technologies.
Moreover, in light of the high drought risk observed in Chile understanding the underlying mechanisms of irrigation adoption is of fundamental value. Historically droughts are frequent and affect 25 % of the continental territory. Furthermore, climate change studies estimate an intensification of aridity in the north zone, advances of the desert toward the south, and less precipitation in the central zone at the end of the 21st century (FAO 2010). Thus, the augment in temperature and decline in precipitation along with an increasing demand for water resources foresee a higher drought risk for the next decades. Therefore, improvements in water efficiency by the adoption of modern technology are likely to become essential to reduce the vulnerability of agriculture in the future.
The rest of the article is organized as follows: Sect. 2 reviews the main arguments enhanced by literature as determinants of technology adoption. Section 3 describes the empirical strategy and data used to carry out this study. Section 4 presents the main results, and Sect. 5 concludes the article.
2 Conceptual framework on adoption of new technology
There is an extensive literature aimed at explaining the process of technology adoption.3 Lower adoption rates are generally associated with imperfections in credit markets, information, agro-ecological characteristics, input and output markets as well as inadequate incentives associated with farm tenure arrangements, problems mainly observed in developing countries (Feder et al.1985; Bardhan and Udry 1999).
A key element relates to the reduced credit opportunities farmers face. Lack of access to credit in rural areas arises as a consequence of asymmetric information and enforcement problems in the lender-borrower relation. This is particularly augmented among small farmers in developing countries due to the lack of sufficient collateral (Udry 1994). Thus, when innovations require significant levels of investment, credit constraints may turn out to be a limiting factor in adoption decisions. In addition, as the diffusion of innovation is scarce and fails to reach potential users, farmers may face trouble in obtaining the maximum benefit from shifting to modern technologies. The optimal use of new production methods involves adoption of new technologies to the local conditions, which implies a costly learning process (Foster and Rosenzweig 1995). Imperfect knowledge about the usage of new technology constitutes a barrier that delays the adoption process. Furthermore, it is expected that new technologies are more likely to be adopted in rural zones with better support infrastructure and localized near main commercial centers, in which the availability of both complementary inputs and maintenance services are more abundant (Sunding and Zilberman 2001). In addition, tenurial arrangements that characterize the landlord-tenant relationship and land rent contracts can affect adoption decisions. For instance, small farmers without land of their own and facing short-term land contracts are less probable to adopt innovations since they may be unable to enjoy the long-term benefits of doing so (Bahduri 1973). Finally, agro-ecological characteristics that capture environmental heterogeneity are essential to attain a better understanding of the process of adopting sustainable agricultural technologies (Dinar and Yaron 1990; Lee 2005). In particular, modern irrigation methods have a higher relative advantage in zones with lower land quality which lower water-holding capacity (Caswell and Zilberman 1986; Dinar and Zilberman 1991).
In relation to household characteristics, variables that control for differences in farm size, off-farm opportunities, human capital, and gender play an important role to capture the intra-household dynamic in explaining adoption levels (Doss 2006). One key factor less explored in literature is the role of risk in adopting new technology (Foster and Rosenzweig 2010). Rural households must deal with high-income fluctuations as exposed to a variety of uncontrollable factors such as climate conditions, economic fluctuations, policy uncertainty, and individual-specific shock4 (Bardhan and Udry 1999; Dercon 2002). In this context, decision making under uncertainty is characterized by risk because some possible outcomes have an undesired effect. If we assume farmers are risk averse, they would adjust their behavior implementing actions aimed at smoothing income and/or consumption (Dercon 2002). However, when credit and insurance markets are absent or incomplete, poor farmers characterized by limited landholdings, few assets, and lower schooling face serious constraints to smooth consumption.5 Consequently, it is expected that farmers depend on ex-ante management strategies to smooth income, which would imply preferences for traditional technology with lower expected returns. It may be true for new irrigation methods that due to higher exigencies of knowledge in its use, adoption would raise the likelihood of failure in spite of higher expected benefits. However, modern irrigation technology is also recognized for being a risk-decreasing input when reducing dependence on rainfall and water availability, which make yields more stable. Koundouri et al. (2006) and Torkamani and Shajari (2008) found a positive effect of production risk on switching from traditional to modern irrigation technology, supporting a risk-decreasing effect.
3 Agricultural sector and family farming in Chile
In this paper, we examine the effect of production risk on irrigation choices, focusing on a sample of family farmers in Chile among which modern irrigation is an incipient agricultural practice. The agricultural sector is important in Chile, accounting for 3.5 % of the Gross Domestic Product (GDP) and employing around 12 % of the country’s labor force. More than 50 % of production is commercialized in international markets, which makes the sector highly dependent on world market prices. The sector benefits from huge climate diversity, which allows an ample range of cropping activities. This agro-ecological diversity is considered one of the Chile’s main comparative advantages. Some major agriculture products consist of fruits, including grapes, apples, pears, peaches, and berries; horticulture, including garlic, onions, and asparagus; and cereal and tuber such as wheat, maize, and potatoes.
Family agricultural production represents one-third of Agricultural Gross Domestic Product (AGDP) and contributes with 1.2 % of the GDP in Chile. In addition, this segment controls 85 % of the farms in the country, and generates 60,000 direct and indirect jobs, benefiting 1.2 million of people. Furthermore, family agricultural producers are one of the main food suppliers in the country, providing around 60 % of food consumed in the domestic markets (INDAP 2011). Family farmers are characterized by being mainly involved in traditional farming activities such as annual crops, horticulture, and extensive cattle farming. They operate small plots at low levels of working capital and often face credit constraints. For simplification, the Ministry of Agriculture defines family farmers as those holding 12 hectares or less of basic irrigation (HBI) (FAO 2009). We follow this definition in this paper.
This study uses data from the VII National Agriculture and Forestry Census carried out in Chile (INE 2007).6 All data is at the household level, except for tenancy status, which was collected at the plot level. Household level data is combined with location level data for soil and climate characteristics.
The Census only reports information on output and input variables for annual crops. Farmers involved in other economically relevant cropping activities, such as fruit trees and horticulture, were unfortunately not asked to report production and input volumes. Given that our framework relies on the estimation of the production function to compute risk measures, our data is not suitable to investigate the association between irrigation technology and production risk to a larger segment of Chile’s agricultural sector, other than farms growing annual crops. In spite of the limitations outlined above, census data allow us to deal with a recurring problem observed in site-specific data, in which a few villages or areas are surveyed, and data lack sufficient variation capturing the agricultural potential (Doss 2006). The Census gives us an exceptional opportunity to exploit the climate diversity that characterizes the Chilean territory. Due to its unusual length and the diversity of its landscapes and ecosystems, Chile has many distinct climates, ranging from desert to frosty polar in the extreme south. A national coverage of the Census running more than 4000 km from north to south guarantees a unique setting to study the role of natural pre-conditions (rainfall and soil characteristics) in the identification of selection into irrigation.
We choose to focus on potato farming. The choice of this crop relies on the economic and social importance for agricultural income-dependent farmers. This crop is the third more relevant annual crop in term of surface and occupies the second position when production value is taken into account. Apart from its economic relevance, potato farming is important from a social perspective due to the fact that it demands great amounts of labor mainly during harvest season, which is particularly transcendental in those zones with higher unemployment. Moreover, this crop extends across the whole territory and its distribution can clearly be organized in agro-climatic zones well differentiated (INIA 2006). This feature allows us to pick up agricultural potential with more precision. Another issue is that we are not able to distinguish amounts of inputs per crop. Thus, to ensure a clean association between observed inputs and potato production, we decided to focus on the sample of potato farmers whose entire land is allocated to this crop. This resulted in a sample of 7274 observations.
Number of farmers and hectares per irrigation category
Mean and standard deviation for inputs, environmental and location variables per irrigation category
Total surface (hectares)
Total labor (N°)
Capital (Chilean pesosa)
Fertilizer machine use
Soil quality (ratio)
Farmers’ and institutional characteristics per irrigation category
Reside in plot
>50 and <75
>25 and <50
Secure tenure (hectares)
Own with registered title
Participation in organizations
Average number per locality
Production yield increases as irrigation becomes more sophisticated. The same is true for cultivated area, indicating that irrigation is more likely to be adopted by large farmers. Irrigators mostly reside in zones with lower levels of precipitation. In particular, both modern and traditional irrigators predominate in the central zone. Conversely, non-irrigators are mainly located in southern locations, which experience the highest levels of rainfall.
Education seems to be important to explain adoption of modern technology. Furthermore, modern irrigators seem more agricultural income-dependent than farmers using traditional irrigation. In addition, only 28.5 % of farmers report to have used credit instruments. In relation to extension services, 38.6 % of farmers with improved irrigation methods state to have received extension services in the last 2 years, which compares to the 8 and 16 % observed among traditional irrigators and non-irrigators, respectively. There is a clear trend for irrigators to participate in organizations. Whereas participation reaches around 30 % among irrigated farms, this figure is only 15 % among non-irrigators. Regarding land property status, owning land with a registered title and rented land is more likely among irrigators. While this amount is around 90 % of total land among irrigated farms, it constitutes only 34.6 % of land held by non-irrigators.
Number and percentage of farmers per water source and irrigation category
Seasonal regulation reservoir
Yearly regulation reservoir
Water rights status per irrigation category
Registered in Real State Registrar or in the public land registry of the General Bureau of water
Title in process of regularization
Use de facto
Up to 44 % of non-irrigators report to have wells as water source in the plot. Differences in costs associated with water extraction between surface and ground water sources naturally impose a restriction to adopt irrigation. However, these restrictions seem to be less important for the adoption of modern irrigation. Wasting water becomes much more costly when pumped from ground water sources8 and the availability of water sources other than rivers may promote adoption of new technology (Caswell and Zilberman 1986).
Around 85 % of water sources held by non-irrigators fall into categories classified as insecure tenancy—title is in process of regularization or use de facto—in contrast to that observed in both modern and traditional irrigation. Undoubtedly, usage rights are crucial to create correct incentives to undergo innovations that require time to become profitable.
5 Estimation procedure
The procedure to analyze the effect of production risk on adoption decisions follows two steps. In the first stage, we estimate the moments of a production function to proxy production risk. In the second stage, the estimated moments are incorporated to explain adoption of modern irrigation in discrete choice models.
5.1 Production risk
OLS provides consistent estimates of the parameter δ, and the predicted values are consistent estimates of the second moment of production distribution (Antle 1983). Estimation of the third moment follows the same procedure. This approach exploits the use of cross-sectional data assuming that the moments vary among farmers depending on input level, farms’ characteristics and environmental conditions. Conditional moments are thereby used as measures of volatility to rank farmers in terms of production risk.
5.2 Irrigation choices
In the second stage, the estimated moments are incorporated as explanatory variables in a discrete choice model. Additional control variables include a dummy denoting if the farmer is male; farmers’ age measured in years (in log); farmers’ level of education; a categorical variable that captures the degree of dependence on agricultural activity; a dummy variable indicating if the farmer lives in the plot; the farm’s size measured in total hectares (expressed in a logarithm); capital value of agricultural machinery and tools (expressed in a logarithm); secure tenure measured by the ratio between the sum of family-own hectares and rental land over total hectares; a dummy variable indicating if the farmer had access to credit during the last 2 years; a dummy variable indicating participation in any agricultural organization; a dummy variable denoting if the farmer received extension services during the last 2 years; percentage of non-eroded and slightly eroded soil; number of both modern and traditional adopters per locality regardless of crops; and a set of dummy variables to control for unobserved spatial differences in technology choice across zones.
Estimates of the selection equation
Probit with sample selection
Irrigation = 1
Standard deviation of rainfall
Skewness of rainfall
LR test (ρ = 0)
Estimates of the models of technology adoption
Irrigation = 1
Level: 1, 2, 3
Probit on selected sample
Modern irrigation = 1
Probit with sample selection
Modern irrigation = 1
Moments of production distribution
Reside in farm
N° irrigat (T)
N° irrigat (M)
Furthermore, the number of adopters of both traditional and modern irrigation at the local level is also significant. This result is in line with the literature addressing the role of social learning spillover on adoption of new technology among farmers that belong to related networks or adjacent geographical areas. For example, Foster and Rosenzweig (1995) find that neighbors’ experience influence rates of adoption and profitability of high-yielding varieties (HYV) in India. The later suggests that farmers involved in a bigger network of experienced farmers with new technology are more likely to adopt the new technology and are relatively more profitable. Furthermore, Conley and Udry (2010) investigate the role of social learning in the diffusion of a new agricultural technology in Ghana. They find support of farmers adjusting their inputs in accordance with those of their neighbors who were surprisingly successful in previous periods. Finally, Bandiera and Rasul (2006) present evidence on how farmers’ decisions to adopt a new crop relate to the adoption choices of their network of family and friends in Mozambique. The authors find farmers are more likely to adopt when other farmers in their network also adopt.
When looking at the results from the probit model and ordered probit model (column 1 and column 2, respectively), we also find significant effects of gender, farm size, secure tenure, and participation in organization. Gender differences in technology adoption are discussed in Ndiritu et al. (2014). The authors find a gender gap in the adoption pattern for some farm technologies in Kenya, indicating the existence of certain socioeconomic inequalities and barriers for female farmers. Furthermore, the larger the farm is the more probable adoption of irrigation technology. Just et al. (1980) show that given the information and transactions costs associated with innovations, as these costs increase, the critical size that make the adoption profitable also increases. The latter implies that new technology, which involves larger information/transactions costs are less likely to be adopted by smaller farmers. Empirical works confirm this prediction (Negri and Brooks 1990; Shrestha and Gopalakrishnan 1993; Skaggs 2001; Daberkow and Mcbride 2003; Schuck et al. 2005).
Farmers that hold a larger ratio of both owned land and land under property rental contracts are more likely to irrigate. Similar results are found in the literature before. For example, Soule et al. (2000) investigate the influence of land tenure on the adoption of conservation practices in US. They find that the owner-operators are more likely to adopt practices that provide benefits over the longer term. Furthermore, Gebremedhin and Swinton (2003) examine the role of land tenure security in investing in soil conservation in northern Ethiopia. They find that adoption of technologies associated with long-term investment such as stone terraces was positively influenced by land tenure security. These findings confirm the importance of designing tenancy arrangements that guarantee rights to enjoy long-term benefits derived from implementing technological innovations.
In addition, results show that farmers participating in agrarian organizations are more likely to use irrigation. Participation in organization may serve as a vehicle for the adaptation, likely because transmission and diffusion of knowledge on new technologies are fostered in organizations. These results are in line with Isham (2002). The author finds that households with ethnically based and participatory social affiliations in Tanzania may be more likely to diffuse new information successfully and therefore to adopt new technologies.
Estimates of the models of technology adoption with interactions
Irrigation = 1
Level: 1, 2, 3
Probit on selected sample
Modern irrigation = 1
Probit with sample selection
Modern irrigation = 1
Moments of production distribution
Reside in farm
Edad × Secure tenure
Edad × Extension
Edad × Credit
Education × Secure tenure
Education × Extension
Education × Credit
Land × Secure tenure
Land × Extension
Land × Credit
N° irrigat (T)
N° irrigat (M)
There are some discrepancies in the results concerning the variables (1) residence in the farm, (2) soil quality, and (3) production risk measures. Regarding (1), results show that farmers who reside at the farm premises are more likely to adopt irrigation technology. In particular, farmers are more willing to shift from non-irrigation to the new technology, as shown by the multinomial probit, and change from traditional irrigation to new technology, as suggested by the probit model with sample selection. These results may be consistent with information diffusion arguments (Foster and Rosenzweig 1995) Bandiera and Rasul 2006), as interactions and networks associated with farming activities are more likely to happen on-farm.
Moreover, results from the multinomial probit model show that both traditional and modern irrigation are promoted in zones with poorer soil conditions, probably as a means to deal with these disadvantageous characteristics. However, soil quality considerations do not seem to drive shifts from traditional to modern irrigation. Results are in line with previous studies finding that modern irrigation technologies are more likely used in locations with relatively low land quality (Caswell and Zilberman 1986; Dinar and Yaron 1990; Green et al. 1996).
Regarding production risk, results are twofold. On the one hand, production risk positively affects the shift from non-irrigation to adoption of traditional technology. In other words, our findings suggest that the greater the variance of production, the higher the probability farmers will implement traditional irrigation systems. Similarly, a greater value in the skewness of production entails a higher probability of implementing traditional irrigation. This last finding tells us that farmers care about downside yield risk, assigning negative weights to production distribution that show higher probabilities of obtaining lower production values. On the other hand, adoption of modern irrigation responds negatively to increases in both variance and skewness of production when having traditional irrigation as baseline. Results are robust to regional differences (see Appendix 2).20 The latter entails that farmers are less willing to shift to modern irrigation when experiencing less certain yields and higher downside risks. While results regarding traditional irrigation support the well-known decreasing-risk properties of irrigation, findings on modern irrigation are not in line with the ability of new technology to hedge against production risk highlighted in the literature before (Koundouri et al. 2006; Torkamani and Shajari 2008).
To verify if these findings can be applicable to larger segment of the Chile’s agricultural sector, we conduct a series of robustness checks. First, we replicate our results using information on wheat small-scale farmers. Wheat is one of the most important crops in Chile, comprising more than 50 % of the total hectares devoted to annual crops, and grown in the whole country in diverse climate and soil conditions. To allow enough information in all the irrigation categories, we, here, were less restrictive than in the potato case. We selected those farmers that reported to devote more than 90 % of their hectares to wheat farming. This is an issue in the sense that we cannot guarantee that the inputs observed in the data are indeed used in the wheat production process as in the potato case. This is crucial for estimating production risk measures such that results must be interpreted with caution. Results are shown in Appendix 3. We find similar evidence as in the case of potato farmers. Adoption of traditional irrigation is more likely to occur among farmers with high production risk. However, the risk-reducing effect of modern irrigation technology remains unclear. Second, to gain efficiency, we pool observations of farmers allocating 100 % of land to either potato or wheat. Although the pooling exercise seems to be reasonable, issues regarding the association between inputs and outputs can emerge again when potatoes and wheat are not necessarily grown using the same inputs (or we do not observe that). Results are shown in Appendix 4. We find support for previous findings. Traditional irrigation seems to be risk-decreasing from the perspective of non-irrigators while the switch from traditional to modern irrigation increases production risk. Third, potato and wheat farming are more resilient and less water demanding than other crops such that results regarding the switch from no-irrigation to traditional irrigation (and not modern irrigation) reducing production risk may respond to this specific characteristic. To explore this further, we replicate the results for rice farming, a water-intensive crop. However, exactly the same issue emerges as in other similar crops. The rice sector in Chile is small, and it is not spread out the whole territory, which reduces climate variation. The Census reports 1534 rice farmers mainly located in the central–south regions in Chile. The majority of them use traditional irrigation (96 %) and only a small fraction (4 %) modern irrigation. Farmers without irrigation methods amount to 1.56 %. Given the structure of irrigation adoption in rice farming, it is not possible to control for pre-conditions applying sample selection models such that decisions narrow down to a switch from traditional to modern irrigation. One caveat is that we cannot ensure that irrigation is associated with rice farming since many of the rice farmers grow jointly other crops. When applying the criterion of 100 % land allocation in rice to ensure association between inputs and rice output, we end up with very few observations (86), of which only one farmer reports to use modern irrigation. The low adoption of modern irrigation among more water intensive crops suggests that the insufficient technification in irrigation is a general problem in the agricultural sector in Chile. Having those data issues in mind, we replicate the results for those farmers that report to grow rice (see Appendix 5). We do not find significant results for the second and/or third moments of the production distribution, although coefficients are negative.
Lack of support of the risk-reducing effect of modern technology may imply that farmers in Chile are facing problems regarding seeing the virtues of water-saving technologies as risk-decreasing inputs, probably due to the higher uncertainty observed in the earlier stages of diffusion. The optimal use of methods of modern irrigation may depend on certain characteristics of soil and climate that are specific to a particular farm and influence the quantities of water required to achieve efficiency in water application. The structure of this relationship may be more difficult to determine in earlier stages. In fact, new irrigation technology in Chile is indeed in an early phase of the technological cycle, where lower levels of knowledge and diffusion may possibly be adding an additional uncertain component that would offset the advantages of modern irrigation. In contrast, when analyzing the adoption of traditional irrigation, we are looking at shifts from a natural state of non-irrigation toward the use of water input. In particular, this technological change seems to be more developed in Chile and has likely reached a phase of maturity in the technological cycle. The latter supports the importance of improving the understanding and modeling of irrigation choices in settings in which rainfed agriculture is still predominant, as typical in developing countries.
Finally, we evaluate the predictive ability of models looking at the percentage of correct predictions.21 Appendix 6 shows these results. Percentages of correct predictions range from 87 to 96 %, and univariate models explaining modern irrigation choices, having as a baseline traditional irrigation, perform better than multivariate models. Correct predictions as estimating a probit model for modern irrigation choices increases significantly from 1 to 29 %. Correcting for sample selection improves the fitting of the model, adding 14 % extra correct predictions. Furthermore, prediction in all of the remainder irrigation statuses also improves. The latter suggests that modeling non-irrigation as one more level of technology may be inappropriate when there exists specific natural pre-conditions that drive non-irrigation choices. Thus, it seems reasonable to control for these pre-conditions before studying changes from conventional to new irrigation technology.
New irrigation technology can improve productivity by attaining higher efficiency in water application, which also brings external benefits in the form of water conservation. Furthermore, new irrigation methods hold numerous advantages in zones with limiting environmental conditions, i.e. water scarcity and lower soil quality. In this paper, we study the effect of production risk on the adoption of irrigation. A large fraction of rural households in developing countries does not use either modern or traditional irrigation and is completely exposed to climatic variations. This gives rise to the question on how to include non-irrigators when estimating irrigation choices. We discuss results from an ordered, unordered, and sample selection models.
The results indicate that farmers with a higher educational level, larger capital, credit access, receiving extension services, and those who reside in the plot and in communes with larger number of adopters are more likely to adopt modern irrigation. On the other hand, results for production risk depend on the type of irrigation technology. Whereas production risk promotes adoption of traditional irrigation, it seems to be an obstacle when assessing shifts from traditional to modern irrigation. Credit access, extension services and production variance seem to be more important in terms of magnitude.
However, a couple of caveats deserve attention. First, given the cross-sectional nature of our data, we are not able to fully explore dynamics in irrigation decisions. These may be important, especially in examining the role of economic and policy changes on adoption of modern irrigation. Second, our results may be crop-specific since water needs are supposed to vary across different cropping activities. For example, potato and wheat are relatively more resistant to water stress than other crops such as rice and fruits and therefore a switch from conventional to modern irrigation methods may be more likely to be risk-decreasing in these last cases. Even though we did find sufficient evidence for our sample of rice farmers, data issues do not allow us to state plausibly whether our results can be extrapolated to other relatively more water-demanding cropping activities. Further research examining how results vary across different crops is needed.
Despite these considerations, our findings have important implications for the success of government interventions to address concerns of the low rate of adoption of new irrigation technology. First, adoption of irrigation indeed reduces risk; however, we found that farmers may experience an increase in production risk when switching from traditional to modern irrigation methods. This increased risk may be because of lack of diffusion and knowledge on water-saving technology, which make future profit flows much more uncertain, especially in early stages of the technological cycle. The latter prevents the full exploitation of the advantages of modern irrigation in terms of high productivity and lower production volatility. Our results suggest that policy interventions through extension programs providing adoption-related information and easing access to credit are necessary to induce faster adoption and diffusion among small-scale farmers. Second, we found evidence in favor of sample selection correction as analyzing irrigation choices. Therefore, controlling for pre-conditions that determine irrigation before analyzing changes in technology is crucial to achieve a better understanding on irrigation choices in developing countries where non-irrigators still remain as a significant part of the rural population. Finally, another important implication of our empirical findings is that climate change, which is expected to increase temperature and reduce precipitations in Chile, is likely to have a material effect on the agricultural sector. More specifically, it may increase drought risk and therefore reduce crop yields. Thereby, adoption of more efficient irrigation technologies is crucial to manage the higher climate risk expected for the coming years.
Too much water poured on the ground by traditional irrigation systems may provoke a saturation process, making excess water flow over the land along with pollutants derived from the remains of pesticides and fertilizers.
In the context of locations suffering from water scarcity, conflicting water use and insufficient levels of investment in water supply infrastructure, the adoption of water-saving technologies arises as one alternative to increase efficiency in water use and minimize contamination problems. Furthermore, water-saving technologies contributes to enhance productivity and quality of production through a more uniform and precise irrigation (Dinar and Zilberman 1991; Khana and Zilberman 1997; Zilberman et al. 1997).
The determinants of modern irrigation have been examined by Caswell and Zilberman (1985), Negri and Brooks (1990), Shrestha and Gopalakrishnan (1993), Green et al. (1996), Skaggs (2001), Foltz (2003), Daberkow and Mcbride (2003), Negri et al. (2005), He et al. (2007), Schuck et al. (2005).
First, climatic risk may trigger harvest failure as a result of occurrences of unexpected events from nature such as drought, flood or frost. Second, the inherent volatility of the agricultural market explained mainly by fluctuations in demand and supply generates another source of income variation via price uncertainty. Third, given the fact that farmers make most decisions in advance far before the final product is sold in the market, prices are not known at the time choices regarding the production process are made. Fourth, the recurrent need that governments face to change the direction of agricultural policy produces a further risk component that enhances the uncertainty in investment decisions. Fifth, individual shock may arise, for instance, when households are hit by an illness or unexpected death of one of its members whose contribution to the family budget is vital.
Alternatively, poor farmers get involved in informal risk–coping mechanisms based on agreements made by members of the same group or community to support each other in the case of shocks. In addition, farmers also cope with risk by generating incomes from off-farm activities or by receiving remittances from relatives that are in a better position
The Agricultural and Forestry Census is conducted each 10 years. The previous Census was carried out in 1997. To our knowledge, the 2007 Census was not designed to be able to track a sub-sample of rural households from previous waves. The latter does not allow us to conduct differences in differences techniques while controlling for unobserved time-invariant effects. However, it is highly likely that structural changes affecting differently irrigators and non-irrigators have taken place in such a long period, which would make difference in difference methods somehow problematic.
Eleven farmers report to have both traditional and modern irrigation. Given the reduced number of modern irrigators in our sample, we define them as adopting modern irrigation.
If we assume that the marginal cost of water is closely associated with the energy cost of pumping water, there is a positive relation between depth of water sources and extraction costs.
Due to lack of data on prices, we proxy production risk by the moments of production function rather than the moments of the profit function as Koundouri et al. (2006) do. This assumption lies in the linear relationship between the moments of profit and production function valid under price-taker individuals.
We used a Translog functional form which assumes inputs in levels, squares and cross variables.
1 hectares = 2.5 acres.
The capital variable was built using information with respect to ownership of draft mechanical capital. These were weighted considering market prices. For the construction of the capital variable, we considered the following tools and machinery: Ploughs trucks, vans, carts, choppers, harvesters, cultivators, zero tillage, spray machines, harrows, rakes, reapers, seeders, hoppers, and tractors.
It takes the value of 0 if the farmer has no formal education, 1 if s/he has partially completed elementary school, 2 if s/he has completed elementary education, 3 if s/he has partially completed high school, 4 if s/he graduated from high school, 5 if s/he has partially completed a technical program, 6 if s/he has completed a technical program, 7 if s/he has partially completed her/his university education and 8 if s/he graduated from college/university.
It takes the value 3 if the agricultural income represents 75 % or more of household income, 2 when the proportion is between 50 and 75 %, 1 if it is between 25 and 50 % and 0 if this percentage is less than 25 %.
Rainfall data were obtained from agro-climate information provided by the Chilean Institute of Meteorological Information (CIMI 2011) between the agricultural seasons 1999–2000 and 2005–2006. Climate measures per location were obtained by matching locations with the nearest meteorological stations. Unfortunately, information for regions VIII, IX, X and XIV are not available in the agro-climate yearbooks with the same level of detail as the rest of the zones. For these cases, we used information available in climate yearbooks collected from meteorological stations situated at airports.
Information on erosion was used as a proxy for land quality. It was extracted from a recent study conducted by the Center of Information in Natural Resources (CIREN 2010), addressed at determining the current and potential erosion of soils in Chile. The methodology for determining the level of erosion integrates a set of soil, topographic, climatic and biological characteristics. Thus, erosion will be more severe to the extent that soils are more porous and sandier, fields are more sloped and hold less vegetation as well as in those locations where precipitations are more “aggressive”.
A regional analysis based on agro-ecological zones with similar underlying natural conditions can be an alternative manner to account for the initial choice of irrigation. Unfortunately, there is not enough information on the irrigation status to reach convergence in the estimations for agro-ecological zones (no non-irrigators in the north region and very few irrigators in the south). The later suggests that the “non-irrigation” status in some regions may lead to issues of colinearity. Alternatively, we replicate all the estimations considering only those regions where each irrigation status is observed. This implied to drop Regions VI, X and XIV from our sample. Yet, the results remain essentially unchanged. Results are shown in Appendix 1.
Due to the inclusion of generated regressors in adoption equations in the form of moments of the production distribution, standard errors were corrected using bootstrapping techniques.
Multicollinearity is always a concern. For instance, education is most likely highly correlated with income variables such as the percentage of income coming from agriculture, capital and land can ease access to credit, etc. However, correlation coefficients show of correlations. We obtained a coefficient of 0.16 for land and credit, 0.22 for land and capital and 0.27 for dependence on agriculture and capital. The later indicates that this is not likely to be a major problem in this data. Results available upon request.
Due to the inexistence of modern irrigation observations in some regions, we were not capable to control for all regional dummies in all the specifications.
A prediction is assumed correct when the estimated probabilities of observing a determined irrigation status surpass 50 %. Predictions for modern irrigators in the probit model with sample selection were computed using conditional probabilities—that is, probability of success conditional on selection. Furthermore, non-irrigation predictions for this model correspond to those computed using estimates of the selection equation.
This study was funded by the Research Support Fund, University of Bio-Bio, Project DIUBB 1567172/RS and Project GI 160317/EF. The authors thank valuable comments received at the seminar of the Development Economics Research Group (DERG), Department of Economics and Department of Food and Resource Economics, University of Copenhagen, and Nordic Conference in Development Economics, Gothenburg, Sweden. Special thanks go to Finn Tarp, Benedikte Bjerge and Marcela Jaime for their valuable comments on earlier versions. The article was also improved by helpful comments from anonymous referees and the editor. The usual caveats apply.
Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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