Summary
Eight Spanish and seven English soils were used to examine methods of determining available soil phosphate. The reference value for the amount of phosphate available was that taken up by six successive cuts of ryegrass grown in a pot experiment.
The L-value had the best overall correlation (r=0.94) but is a lengthy determination. Its laboratory analogue, the E-value, was more rapid and equivalent, with the exception of high-clay soils where it gave anomalous values. An anion-exchange resin technique was most suitable for routine measurement and predicted available phosphate (r=0.88) satisfactorily. re]19730122
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Crisanto, T., Sutton, C.D. Measurement of available phosphate content of some Spanish soils. Plant Soil 39, 399–412 (1973). https://doi.org/10.1007/BF00014806
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DOI: https://doi.org/10.1007/BF00014806