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发帖数: 1544 | 1 http://www.biotech-info.net/Full_version_first_nine.pdf
专业词汇：
Crops engineered to tolerate applications of herbicides,
or so-called “herbicide-tolerant” crops (HT),
Corn and cotton have been genetically engineered to express the
bacterialtoxin Bacillus thuringiensis, or Bt.
Summary：
1） in the first three years of commercial use, this Pesticide Reduction
claim was justified. But since 1999 it has
not been.
2）GE corn, soybeans and cotton have led to a 122 million
pound increase in pesticide use since 1996. While Bt crops
have reduced insecticide use by about 15.6 million pounds
over this period, HT crops have increased herbicide use 138
million pounds. Bt crops have reduced insecticide use on corn
and cotton about 5 percent, while HT technology has increased
herbicide use about 5 percent across the three major crops.
But since so much more herbicide is used on corn, soybeans,
and cotton, compared to the volume of insecticide applied to
corn and cotton, overall pesticide use has risen about 4.1 percent
on acres planted to GE varieties. |
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