Evaluation of preemergence applications of KIH-485, s-metolachlor CGA-154281, and smetolachlor atrazine CGA-154281 for crop phytotoxicity and weed control in corn, Ames, IA, 2003

摘要

The purpose of this study was toevaluate various preemergence applied rates of KIH-485 and s-metolachlor & CGA-154281 for cropphytotoxicity and weed control in corn. The soil was a Canisteo, Nicollet, Clarion and Webster clay loamwith a pH 6.8 and 5.3% organic matter. The experimental design was a randomized complete block withthree replications and plots were 10 by 25 ft. The 2002 crop was soybean. Tillage included a fall chiselplowing and a spring field cultivation. Fertilization included 127 lb/A actual N applied as urea. Cropresidue on the soil surface was 35% at planting. “Garst hybrid 8550” corn was planted 1.5 inches deepon May 19, at 27,700 seeds/A in 30-inch rows. Preemergence (PRE) treatments were applied on May 24at 20 gpa and 25 psi using flat fan nozzles. Conditions on May 24 were: air temperature 17 C, soiltemperature at the 4-inch depth 14 C, 2 mph wind, 40% cloud cover, 52% relative humidity.