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Labile residual fertilizer phosphorus in chernozemic soils part 1 solubility and quantity intensity studies



Labile residual fertilizer phosphorus in chernozemic soils part 1 solubility and quantity intensity studies



Canadian Journal of Soil Science 57(1): 65-74



Granular monoammonium phosphate (500 .mu.g P/g soil) was applied in the field to 3 soils of an Oxbow catena. Changes in the inorganic P forms controlling P concentration or intensity (Ie) in soil solution during the ensuing 2 1/2 yr were determined by equilibrium solubility product and related quantity/intensity analyses. In the Calcareous and Orthic control soils, Ie was controlled by impure hydroxyapatite. After P addition it was controlled by dicalcium phosphate dihydrate and octocalcium phosphate. Marked changes in the quantity of labile P caused negligible changes in values for Ie. In these and similar Chernozemic soils, Ie should adequately reflect the availability of residual P to plants. In the Gleysol after P addition, Ie was determined by adsorbed P or by the solubility of Al/Fe-bound P forms. For this and similar Chernozemic soils the quantity/intensity data indicated that estimates of the availability of residual P will require a measurement of its capacity to maintain Ie at the root-soil interface against depletion by plant uptake rather than a measurement of Ie alone.

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