2008 Joint Annual Meeting (5-9 Oct. 2008): Field Validation of a Metabolically Based Dynamic Cotton Seedling Emergence Model.
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645-4 Field Validation of a Metabolically Based Dynamic Cotton Seedling Emergence Model.



Tuesday, 7 October 2008
George R. Brown Convention Center, Exhibit Hall E
Dennis Gitz, Wind Erosion and Water Conservation Unit, USDA-ARS Cropping Systems Research Lab, 3810 4th ST, Lubbock, TX 79415, Jeffrey Baker, WEWC, USDA-ARS, 302 West I-20, Big Spring, TX 79720, James Mahan, Plant Stress and Germplasm Development Unit, USDA-ARS, 3810 4th St, Lubbock, TX 79415 and Paxton Payton, PSGD, USDA-ARS, 3810 4th ST, Lubbock, TX 79415
A model for cotton seedling emergence based upon enzyme kinetics of malate synthase (MaGi) was evaluated in the field. Cotton (Gossyptim hirsuitum) cvars. FM958, DP 444, FM 800, and PM 2145 were planted weekly at a depth of 5 cm in fields at Big Spring and Lubbock TX. Soil temperatures at seed depth, and seedling emergence were recorded. Time to 50% emergence was calculated and compared to predicted emergence using both MaGi and a commonly employed degree day model based on heat unit accumulation (DD 60). Modeled time to emergence using DD 60 and MaGi were comparable to field values.
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