Summary
Methods of measuring available N have been compared using response and uptake data from maize grown on 155 West Indian soils in greenhouse experiments. Total soil N and Cornfield's alkaline hydrolysable N gave best estimates of available N when all soils were considered together. Correlations between test data and N uptake were best for acid soils, for soils with large cation exchange capacities and for soils with between 80 and 99 per cent base saturation. Differences between correlations for soils from different islands could usually be related to these soil properties.
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Cornforth, I.S., Walmsley, D. Methods of measuring available nutrients in West Indian soils. Plant Soil 35, 389–399 (1971). https://doi.org/10.1007/BF01372670
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DOI: https://doi.org/10.1007/BF01372670