Summary
The technique allows rapid diagnosis of the immediate and incipient deficiencies of various plant nutrients which might occur, singly or in combination, at a particular site. Degrees of deficiency, expressed in terms of standardised plant growth, permit between cut and between trial comparisons, and are therefore a valid comparison of one soil type with another.
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References
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Middleton, K.R., Toxopeus, M.R.J. Diagnosis and measurement of multiple soil deficiencies by a subtractive technique. Plant Soil 38, 219–226 (1973). https://doi.org/10.1007/BF00011230
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DOI: https://doi.org/10.1007/BF00011230