From Pandora's Pantry, by John Robbins,
Because so much Roundup is used on Roundup Ready crops, the residue levels in the harvested crops greatly exceed what until very recently was the allowable legal limit. For the technology to be commercially viable, the FDA had to triple the residues of Roundup’s active ingredients that can remain on the crop.(24) Many scientists have protested that permitting increased residues to enable a company’s success reflects an attitude in which corporate interests are given higher priority than public safety, but the increased levels have remained in force.
Advertisements and glossy brochures, seeking to convince farmers to plant Roundup Ready seeds, speak proudly of “clean fields”—clean in this usage meaning enormous fields with nothing growing in them but soybeans or corn or cotton or canola. This is intended as a selling point, and many farmers go for it, but it is an odd use of the word. The fields are actually so chemicalized that they are virtually sterile, and they bear no resemblance whatsoever to a healthy, flourishing, and biodiverse ecosystem. The soil, relatively void of decaying plant matter, and often impoverished of the worms, insects, and bacteria that feed off it, becomes completely dependent on chemical fertilizers.
Ironically, we’re spraying our fields and food with a toxic substance to make use of a sophisticated technology that is largely unnecessary. There are simpler mechanical ways to deal with weeds, including no-till farming, mulching, and companion cropping. But of course, none of these Earth-friendly methods can be patented and sold for profit, and none fit with massive mono-cultures and reliance on chemicals, so they hold no interest for Monsanto and the other agricultural chemical companies that dominate the business of genetic engineering.(25)Read the whole article here.