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Effect of green manures on kinetics of dissolved and labile phosphorus release in anoxic soil



Effect of green manures on kinetics of dissolved and labile phosphorus release in anoxic soil



Journal of the Indian Society of Soil Science 39(2): 260-265



Dissolved inorganic/organic and labile inorganic P release in anoxic (anaerobic condition) soil treated with different green manures conformed to two simultaneous first order release kinetics. Labile organic P-release was defined by single first order kinetics. Application of Elovich equation successfully described the P release data as a single straight line that covers the entire course of reaction time. It also appears that constant .alpha. and .beta. may also be used for comparison of reaction rates of P release in soil amended with greenmanures. The dissolution rate constant for CaCl2-extractable and labile (inorganic/organic) from anoxic soil treated with various green manures were found to be in the order: cowpea > (Vigna unguiculata) > dhaincha (Sesbania aculeata) > sunnhemp (Crotolaria juncea) > control. The higher rate of P release from cowpea treated soil might be due to its lower C:P: ratio (79.5) than those of dhaincha (101.4) and sunnhemp (103.5). Since the added plant residues enhanced the rate of P release in anoxic soil, this factor should be considered in soil P management practices.

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Accession: 007248850

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