Abstract

It is now accepted by soil scientists as well as agronomists all over the world that soil surveys should be the starting point for the systematic exploitation of land resources. The chief objective of a soil survey is to identify the various kinds of soils occurring in a given region, describe their characteristics, classify them and locate the positions of the classified soils on a base map. The fundamental purpose of soil survey is to make predictions. As such each soil survey report should contain in its body an assessment of the agricultural capabilities of individual soils shown on the soil map and a prediction in terms of expected average yields of specified crops from these soils under defined management practices. To this end of supplying a table of predicted yields for the mapping units, the use of Productivity Rating' has come into vogue.

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