The new regulation lets farmers use more of the chemical, which is the active ingredient in the herbicide Roundup.Under the new regulation, forage and hay teff can contain up to 100 ppm (100,000 ppb) glyphosate; oilseed crops can contain up to 40 ppm (40,000 ppb) glyphosate, and root crops such as potatoes and beets can contain 6000 ppb glyphosate.