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This study was designed to examine the fixation pattern and kinetics of zinc(Zn) in chelated (ethylenediaminetetraacetic acid, EDTA) and non-chelatedmixed micronutrient systems of semi-arid alkaline soils from the Southern HighPlains, USA. Soils were characterized for a suite of chemical and physicalproperties and data obtained from extraction experiments fitted to variouskinetic models. About 30 % more plant-available Zn was fixed in thenon-chelated system within the first 14 days with only about 18 %difference observed between the two systems by day 90, suggesting that theeffectiveness of the chelated compounds tended to decrease over time. Thestrengths of the relationships of change in available Zn with respect toother micronutrients (copper, iron, and manganese) were higher and moresignificant in the non-chelated system (average R2 of 0.83), compared tothe chelated (average R2 of 0.42). Fixation of plant-available Zn wasbest described by the power-function model (R2 = 0.94, SE  =  0.076) inthe non-chelated system, and was poorly described by all the models examinedin the chelated system. Reaction rate constants and relationships generatedfrom this study can serve as important tools for micronutrient management andfor future micronutrient modeling studies on these soils and other semi-aridregions of the world

Fixation kinetics of chelated and non-chelated zinc in semi-arid alkaline soils: application to zinc management