Atrazine Carryover in Soil in a Reduced Tillage Crop Production System

Atrazine [2-chloro-4-(ethylamino)-6-isopropylamino)- s -triazine] carryover under reduced or no-till row crop production systems was measured by planting oats ( Avena sativa L.) the following year as a field bioassay during 1970 through 1976 at Lincoln and North Platte, Nebraska. Oat yields indicate that soil persistence of normal-use rates of atrazine into the subsequent year is only a minor residue problem under reduced tillage cropping systems. Atrazine carryover in soil was less of a problem under these reduced tillage systems as compared with prior experiments with conventional tillage systems across Nebraska.