USDA2014年2月20日在其网站上发布了ERS的美国转基因种植15年来的分析报告《
Genetically Engineered Crops in the United States》。原文见：
http://www.ers.usda.gov/publications/err-economic-research-report/err162.aspx
路透社的相关报道见：
U.S. GMO crops show mix of benefits, concerns - USDA report
1）报告揭穿了方舟子的转基因作物增产的谎言（实际上不仅没有转基因增产的定论，而且，种子价格高了50%）
The seeds are patented and cost more than conventional seeds - the price of GMO soybean and corn seeds grew by about 50 percent between 2001 and 2010, according to the report. But the companies that sell them say they make weed and insect management easier for farmers and can help increase production.
But in its report, the ERS researchers said over the first 15 years of commercial use,
GMO seeds have not been shown to definitively increase yield potentials, and "in fact, the yields of herbicide-tolerant or insect-resistant seeds may be occasionally lower than the yields of conventional varieties," the ERS report states.
Several researchers have found
"no significant differences" between the net returns to farmers who use GMO herbicide tolerant seeds and those who use non-GMO seeds, the report states.
2）报告揭穿了方舟子的转基因作物使用农药少，因而比传统粮食作物食用更安全的谎言 （转基因作物虽然农药杀虫剂少用了0.18磅/公顷，但农药杀草剂使用量增加了0.50磅/公顷。农药总使用量总量是增加的。况且极少量的除草剂残留都会导致癌症。报告中也提到some scientific studies are reporting that the chemicals used on the crops are linked to disease and illness.）。
GMO crops that prevent yield losses to pests is more helpful to farmers financially, allowing crops more yield potential and higher monetary returns, the report states. As well, insecticide use on corn farms was down to 0.02 pound per acre in 2010, down from
0.21 pound per acre in 1995, the report states.
But while insecticide use has gone down, herbicide use on GMO corn is rising, the report states.
Herbicide use on GMO corn increased from around 1.5 pounds per planted acre in 2001 to more than 2.0 pounds per planted acre in 2010. Herbicide use on non-GMO corn has remained relatively level during that same time frame, the ERS said.
3）转基因作物由于要大量使用杀草剂农药，导致农田杂草产生抗药性，使得今后农作物的生产更加困难。
And the over reliance on glyphosate has translated to an increase weed resistance, which makes crop production much harder. Glyphosate is the chief ingredient in Roundup herbicide sold by Monsanto, and its use has translated to the glyphosate resistance seen in 14 weed species and biotypes in the United States, according to ERS.
