A New Technique of Controlling Weeds in Sorghum in a Wheat-Sorghum-Fallow Rotation in the Great Plains

Abstract

2-chloro-4-isopropylamino-6-ethylamino-s-triazine (atrazine) applied at 3 lb/A to wheat stubble shortly after harvest in 1961 and 1962 controlled all vegetation for the remainder of the season. 2-chloro-4,6-bis(isopropylamino)-s-triazine (propazine) was nearly as effective as atrazine in 1962. Grain sorghum was planted in the spring of 1962. No preplanting tillage was used, and no weed control measures were needed in sorghum during the growing season on the treated plots, and crop stands, vigor, and grain yields were superior to those on the cultivated checks.