ARS | Publication request: Field validation of a metabolically based dynamic cotton seedling emergence model

Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: October 5, 2008
Publication Date: October 8, 2008
Citation: Gitz, D.C., Baker, J.T., Mahan, J.R., Payton, P.R. 2008. Field validation of a metabolically based dynamic cotton seedling emergence model[abstract]. ASA-CSSA-SSSA Joint Annual Meeting. Houston, Texas. October 5-9, 2008. Paper No. 645-4

Technical Abstract: 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.