Abstract

Rainfall distribution index defined by earlier workers, was used for weekly rainfall analysis from June 18 to October 14 on the basis of 38 years data from 1958 to 2000 at Chandigarh. The index was considered to be more realistic for crop planning, since the same included number of rainy days. Linear relationships established between the weekly rainfall distribution index (RDI) and weekly rainfall, were found to hold good at 1 per cent level of significance and the regression equations explained more than eighty per cent variation in RDI values. Expected weekly RDI values showed zero values, thirty fifth week (Aug. 27 – Sep. 2) and thereafter at eighty per cent chances, suggesting the necessity of short duration crop varieties for the kharif season.

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