Summary
Effects of temperature and flooded-drained soil conditions on 0.01M CaCl2 extractable phosphorus (soluble P) were investigated in four soils over the period of 42 days after fertilizer-P application. These soils show severe induced P deficiency problem in crops following flooded rice culture. The effects of temperature on the reaction rate constants were determined and activation energy was calculated.
Increasing soil temperature as well as prior flooding of soil decreased soluble P concentration but the effect of the latter was dominant. The decrease in soluble P concentration in these soils with time followed a first order kinetics and the rate constant (K1) increased as the temperature increased from 10°C to 30°C. The activation energy (Ea) for the kinetics of soluble P concentration in soil, as affected by temperature, was found to be 8.9 and 34.5 KJ mol−1 for Meyers and Willows clay, respectively, over the temperature range studied.
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Sah, R.N., Mikkelsen, D.S. Effects of temperature and prior flooding on intensity and sorption of phosphorus in soil. Plant Soil 95, 163–171 (1986). https://doi.org/10.1007/BF02375068
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DOI: https://doi.org/10.1007/BF02375068