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Impact Evaluation of Alternative Irrigation Technology in Crete: Correcting for Selectivity Bias

机译：克里特岛替代灌溉技术的影响评价：纠正选择性偏差

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摘要

The interest in promoting food and water security through development projects has led to the need to evaluate the impact of these projects. This study evaluates the impact from transitioning to a modern irrigation technology. Deciding to adopt or not an alternative irrigation technology (sprinklers) is not necessarily a random determination. Therefore, selection bias can be present and this can lead to biased estimates. In this study, we apply methodological specifications to correct for self-selectivity biases. Then, we measure and compare the technical efficiency scores from adopters and non-adopters. The empirical application uses data covering 56 small-scale greenhouse farms in Crete (Greece) for the cropping years 2009-2013. The results reveal that the average technical efficiency for farmers who adopted sprinkler irrigation is lower than the group of non-adopters, when the presence of selectivity bias cannot be rejected. This implies that either the farmers need more time to incorporate the know-how of the newly acquired technology or they become less motivated after the adoption. Consequently, agricultural water saving technologies need to be promoted in combination with support to the farmers, so they can cope with the lower performance in the first years after adoption.
机译：通过开发项目促进食品和水安全的兴趣导致需要评估这些项目的影响。本研究评估了过渡到现代灌溉技术的影响。决定采用或非替代灌溉技术（洒水喷水器）不一定是随机测定。因此，可以存在选择偏差，这可以导致偏置估计。在这项研究中，我们应用方法论规范以纠正自我选择性偏差。然后，我们测量并比较来自采用者和非采用者的技术效率得分。实证应用程序使用克里特（希腊）的数据覆盖56个小型温室农场，为2009 - 2013年的裁剪年。结果表明，采用喷水灭火灌溉的农民的平均技术效率低于非采用者组，当不拒绝选择性偏差的存在时。这意味着农民需要更多的时间来纳入新获得的技术的知识，或者在采用后变得不那么激励。因此，需要与对农民的支持组合促进农业节水技术，因此他们可以在采用后的第一年来应对较低的性能。

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