Soil test distribution patterns were examined statistically for a large sample. Available N and K were normally distributed, while available P distribution followed the semilog type. Conformity to theoretical distributions was very close in all three cases. The identification of these patterns has been suggested as a useful preliminary to quantitative evaluation of available nutrient status of soils for NPK, leading to accurate assessment of fertiliser requirements. It can also be employed for evaluating monetary benefits to be expected by following recommendations based on soil tests. It is suggested that the voluminous soil test data accumulated so far be examined with computers, for the basic distribution patterns mentioned above. There are indications that a number of other soil properties may also be normally distributed.
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Tamil Nadu Agricultural University
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