Revisiting the Impact of Bt Corn Adoption by U.S. Farmers-回顾美国农民采用Bt玉米的影响

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英文文献：Revisiting the Impact of Bt Corn Adoption by U.S. Farmers-回顾美国农民采用Bt玉米的影响
英文文献作者：Fernandez-Cornejo, Jorge,Wechsler, Seth James
英文文献摘要：
This study examines the impact of adopting Bt corn on farm profits, yields, and insecticide use. The study employs an econometric model that corrects for self-selection and simultaneity. The model is estimated using nationwide farm-level survey data for 2005. Regression analysis confirms that Bt adoption is associated with increased profits, yields and seeding rates. However, the results of this analysis suggest that Bt adoption is not significantly related to insecticide use. This result appears to be related to the fact that insect infestation levels were lower in 2005 than they were in earlier years.

这项研究调查了采用Bt玉米对农场利润、产量和杀虫剂使用的影响。该研究采用了一个计量模型，修正了自我选择和同时性。该模型是利用2005年全国范围内的调查数据估算的。回归分析证实，采用Bt与增加利润、产量和播种率有关。然而，这项分析的结果表明Bt的采用与杀虫剂的使用没有显著的相关关系。这一结果似乎与2005年的虫害程度比前几年要低有关。

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