Summary
The practical value of soil analyses depends to a large extent on the accuracy of the calibration of the tests under field conditions. Examples are given to illustrate the procedure followed in work performed in the Netherlands along these lines.
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van der Paauw, F. Calibration of soil test methods for the determination of phosphate and potash status. Plant Soil 8, 105–125 (1956). https://doi.org/10.1007/BF01398813
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DOI: https://doi.org/10.1007/BF01398813