Summary
Of the phosphate applied to two soils in the field, 42 and 100 per cent respectively remained in the top six inches three years later. The loss from the organic soil is believed to have been due to leaching. In the soils from both sites, half the residual phosphate (measured by isotopic dilution) was still labile, and within each soil the uptake of phosphate by ryegrass was highly correlated with the L-value. However, the phosphate in the labile pools of the two soils differed: in the soil that had lost phosphate, a greater fraction of the pool was in the soil solution and a greater proportion was taken up by ryegrass grown in pots. It is suggested that such differences in the behaviour of the phosphate within the labile pool may yield information on the mechanism of phosphate retention.
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Sutton, C.D., Larsen, S. The residual value of fertilizer phosphate applied in two field experiments. Plant Soil 18, 267–272 (1963). https://doi.org/10.1007/BF01347880
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DOI: https://doi.org/10.1007/BF01347880