Weed management with the computer-based Herbicide Application Decision Support System (HADSS) program



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Texas Tech University


Field experiments were initiated in 1999 and continued in 2000 to evaluate the Cotton Herbicide Application Decision Support System (HADSS®) program in Texas Southern High Plains cotton production. Weed management systems in the irrigated experiment were evaluated in a natural infestation of Palmer amaranth (Amaranthus palmeri S. Wats) and devil's-claw [Proboscidea louisianica (Mill.) Thellung], while the dryland experiment had Palmer amaranth, devil's-claw, and silverieaf nightshade {Solanum elaeagnifolium Cav.). Weed management systems evaluated were: (1) a preplant incorporated (PPI herbicide followed by (fb) postemergence HADSS® recommendations (PPI fb POST HADSS®); (2) postemergence HADSS® recommendations alone (POST HADSS®); and (3) Texas Agricultural Experiment Station (TAES) recommendations for the Texas Southern High Plains. All weed management systems were evaluated in glyphosate [A/-(phosphonomethyl) lycine]-tolerant, bromoxynil 3,5-dibromo-4-hydroxybenzonitrile)-tolerant, and conventional cotton varieties and each system was compared to an untreated and weed-free check in each variety. Weed control was evaluated approximately two weeks after each treatment and at harvest and cotton lint yields and net returns over weed control costs were determined for each weed management system.



Growth (Plants), Herbicides, Weeds, Cotton growing, Dry farming, Irrigation farming