Broadleaf weed control in dry beans with preemergence herbicides followed by sequential postemergence herbicides

摘要

Research plots were established on May 31, 2006 at the Agricultural Science Center, Farmington, New Mexico to evaluate the response of dry beans (var. Bill Z) and annual broadleaf weeds to preemergence followed by sequential postemergence herbicides.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 four replications. Individual plots were 4, 34 in rows 30 ft long. Treatments were applied with acompressed air backpack sprayer calibrated to deliver 30 gal/A at 30 psi. Dry beans were planted with fiexi-planters equipped with disk openers on May 31. Preemergence treatments were applied on May 31 and immediately incorporated with 0.75 in of sprinkler-applied water. Postemergence treatments were applied on June 29 when dry beans were in the 3rd to 4th trifoliate leaf stage and weeds were small. All postemergence treatments had a crop oil concentrate and Uran 32 added at 0.5 and 1.0 percent v/v. Black nightshade, prostrate and redroot pigweed and common lambsquarters infestations were heavy and Russian thistle infestations were light throughout the experimental area. Treatments were evaluated on August 1.