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Effects of phosphate buffer capacity of soil on the phosphate requirements of plants

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Summary

Plant-uptake and yield data for ryegrass in a greenhouse experiment are used to estimate the theoretical fertilizer phosphate requirement (Pf) of 24 Sherborne soils. Pf is shown to be a function of three parameters: (i) quantity of P required by the plant (Pr) for optimum yield; (ii) quantity of soil P (Qr) required to maintain a non-limiting soil solution concentration (Ir); (iii) quantity of labile soil P (Q). Because of its large effect on Qr and Ir, the phosphate buffer capacity has an important effect on Pf. However Pf cannot be directly related to phosphate buffer capacity if Q is ignored. On soils of similar Q, increasing buffer capacity will always have a positive effect on Pf, but on soils of the same I, it may have a positive or negative effect on Pf. Consequently, Pf can only be simply, but inversely, related to Q or I on a group of soils of similar phosphate buffer capacity. re]19750513

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References

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  1. I. C. R. Holford

    Present address: Agricultural Research Centre, R.M.B. 944, 2340, Tamworth, N.S.W., Australia

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  1. Rothamsted Experimental Station, Harpenden, Herts, England

    I. C. R. Holford

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Holford, I.C.R. Effects of phosphate buffer capacity of soil on the phosphate requirements of plants. Plant Soil 45, 433–444 (1976). https://doi.org/10.1007/BF00011705

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  • DOI: https://doi.org/10.1007/BF00011705

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