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Experiments on effects of phosphorus on the manganese nutrition of plants

I. Effects of monocalcium phosphate and its hydrolysis derivatives on manganese in ryegrass grown in two Buganda soils

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Summary

Monocalcium phosphate (MCP), the salt of concentrated superphosphate, applied to a Buganda soil increased the amount of manganese taken up by ryegrass. To investigate the cause of this effect the derivatives of MCP hydrolysis, dicalcium phosphate (DCP) and ‘triple-point’ solution (TPS) were separated and applied independently. Both derivatives, and a synthetic dicalcium phosphate dihydrate, increased the concentration of manganese in ryegrass showing that dissolution of soil manganese by TPS (pH 1.48) was not a unique cause.

DCP derived by hydrolysis of MCP supplied little phosphorus to early crops of ryegrass but a larger proportion of its P was taken up by later crops; TPS supplied more of its P to earlier than to later crops. During 42 weeks the proportions of P taken up from DCP and TPS were similar to the proportions of phosphorus in these forms when MCP hydrolyzes.

Phosphorus in DCP derived by hydrolysis of MCP was more available to ryegrass than phosphorus in a synthetic dicalcium phosphate dihydrate, showing that results may be misleading when synthetic materials are used to simulate the compounds that form from fertilizers in soil. re]19760401

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  1. P. H. Le Mare

    Present address: Department of Soil Science, University of Reading, London Road, RG1 5AQ, Reading, U.K.

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  1. Rothamsted Experimental Station, Harpenden, Herts

    P. H. Le Mare

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Le Mare, P.H. Experiments on effects of phosphorus on the manganese nutrition of plants. Plant Soil 47, 593–605 (1977). https://doi.org/10.1007/BF00011029

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  • DOI: https://doi.org/10.1007/BF00011029

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