Broadleaf weed control in field corn with postemergence applications of topramezone and diflufenzopvr plus dicamba applied alone or in combination with glvphosate

摘要

Research plots were established on May 7, 2009 at the Agricultural Science Center, Farmington, New Mexico, to evaluate the response of field corn (var. Dekalb DKC49-32) and annual broadleaf weeds to postemergence applications of topramezone alone or in combination. Soil type was a Wall sandy loam with a pH of 7.8 and an organic matter content of less than 1%. The experimental design was a randomized complete block with three replications. Individual plots were 4, 34 in rows 30 ft long. Field corn wasplanted with flexi-planters equipped with disk openers on May 7. Postemergence treatments were applied on June 3 when corn was in the 4th to 5th leaf stage and weeds were <4 inch in height. S-metolachlor was applied preemergence on May 11 to all treatments at 19 oz ai/A. Russian thistle, prostrate and redroot pigweed infestations were heavy and common lambsquarters and black nightshade infestations were moderate throughout the experimental area. Postemergence treatments were evaluated on July 7.