From a paper:

"On whether RR soybean systems reduce pesticide use and increase grower profits, our analysis shows that –

• RR soybean systems are largely dependent on herbicides and hence are not likely to reduce herbicide use or reliance. Claims otherwise are based on incomplete information or analytically flawed comparisons that do not tell the whole story.

• Farmers growing RR soybeans used 2 to 5 times more herbicide measured in pounds applied per acre, compared to the other popular weed management systems used on most soybean fields not planted to RR varieties in 1998. RR herbicide use exceeds the level on many farms using multitactic Integrated Weed Management systems by a factor of 10 or more."

https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.41...