Public agencies are placing greater scrutiny on herbicide applications by farmers. For example, the corn herbicide atrazine is now classified as a restricted use pesticide, with limits placed on allowable rates. While soybean growers may share some of this concern for the environment, rate reduction is more likely to be attractive for economic reasons. Some growers are already cutting back on herbicide rates. For example, Missouri data shows that the average application rates for soybean herbicides were only 75% of the labelled rate. While reduced rates might save growers money, and may be kinder to the environment, there is a concern that poorer weed control could show up under unfavorable conditions.
Jones, D. S.; Lin, H.; Kane, M. V.; and Grabau, Larry J., "Reduced Scepter Rates for Broadleaf Weed Control in Soybean" (1993). Agronomy Notes. 145.