This study aims to shed light on the impact of the crop diversity criterion of green payments on farms' economic and environmental performances, alongside land use practices. In order to provide causal evidence, we exploit the natural experiment from the 2013 Common Agricultural Policy reform, which established stronger crop diversity eligibility criteria for farmers with over 10 ha (and 30 ha) of arable land. More precisely, we use a difference-in-discontinuity design on a sample of French farms and compare those respectively above and below the two thresholds. Our findings suggest that farms around 10 ha experienced significant land reallocation and an increase in crop diversity, while farms around 30 ha increase their number of crops. Interestingly, we also found that the main effects were primarily driven by farms that already met the diversification requirements. This suggests that the crop diversity criterion did not result in much additional change.

中文翻译：

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CAP 绿色付款的作物多样性标准是否影响了农场的经济和环境绩效？来自法国的准实验证据


本研究旨在阐明绿色支付的作物多样性标准对农场经济和环境绩效以及土地使用做法的影响。为了提供因果证据，我们利用了 2013 年共同农业政策改革的自然实验，该改革为拥有超过 10 公顷（和 30 公顷）耕地的农民建立了更严格的作物多样性资格标准。更准确地说，我们对法国农场的样本使用不连续性差分设计，并分别比较高于和低于两个阈值的农场。我们的研究结果表明，10 公顷左右的农场经历了大量的土地重新分配和作物多样性的增加，而 30 公顷左右的农场增加了作物数量。有趣的是，我们还发现，主要影响主要是由已经满足多元化要求的农场驱动的。这表明作物多样性标准没有导致太多额外的变化。