英文文献：Conservation Tillage, Pesticide Use, and Biotech Crops in the U.S.A-本文介绍了一项正在进行的项目的第一部分，该项目的目标是展示美国主要作物保护性耕作、转基因作物的采用和农药使用之间的长期关系
英文文献作者：Fernandez-Cornejo, Jorge,Hallahan, Charles B.,Nehring, Richard F.,Wechsler, Seth James,Grube, Arthur
英文文献摘要：
This paper presents the first part of an ongoing project whose objective is to present a long term relationship between conservation tillage, adoption of GE crops and pesticide use for major crops in the United States. In addition, the project aims to provide some innovative tests on causality using a panel data set. This paper presents preliminary results for soybeans.

此外，本项目旨在利用面板数据集提供一些创新性的因果关系检验。本文给出了大豆的初步结果。