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This study examined and compared the fixation and fixation kinetics ofcopper (Cu) in chelated (ethylene diamine tetraacetic acid, EDTA) andnon-chelated mixed systems of micronutrients in the semiarid soils of theSouthern High Plains, USA, using findings from Cu extraction studies andkinetic models. Approximately, 22 % more Cu was fixed in the non-chelatedsystem compared to the chelated within the first 14 days with only 7 % difference between the twosystems by day 90. Findings suggest a decrease in the effectiveness ofchelated micronutrients over time, highlighting the significance of timingeven when chelated micronutrients are used. The strengths of therelationship of change in available Cu with respect to other micronutrients(iron (Fe), manganese (Mn), and zinc (Zn)) were higher in the non-chelatedsystem (R2: 0.68–0.94), compared to the chelated (R2: 0.42–0.81),with slopes of 0.40 (Cu–Fe), 0.31 (Cu–Mn), and 1.04 (Cu–Zn) in thenon-chelated system and 0.26 (Cu–Fe), 0.22 (Cu–Mn), and 0.90 (Cu–Zn) inthe chelated system. Reduction in the amount of available Cu was bestdescribed by the power function model (R2 =  0.91, SE  =  0.081) in the non-chelated system and second-order model (R2 =  0.95, SE  =  0.010) in the chelated system. The applications generated from this study could be used as tools for improved micronutrient management and also providebaseline data for future work in other semiarid/arid alkaline soils of theworld. Findings are also more applicable to field settings, an improvementover related previous studies

Examining the fixation kinetics of chelated and non-chelated copper and the applications to micronutrient management in semiarid alkaline soils