Abstract

The rainfall data pertaining to 40 years were analysed and contingent crop plan was developed for Trichy district. The annual mean rainfall was 742.02 mm. The distribution pattern of annual rainfall over the 40 years reveals that in 15 years, it was normal (37.5%) and in 10 years, it was deficit (25.0%). Excess rainfall was recorded in 13 years (32.5%). In two years, the rainfall was scanty (5.0%). Among the four seasons, North East monsoon contributes the highest quantity rainfall (47.2%) followed by South West monsoon (37.5%). The sowing rains of 20 mm and above were recorded in the third week of August through the end of the year. Based on the rainfall pattern, suitable crops are recommended for various soil types like red, black and salt affected soils.

Keywords: Rainfall, Cropping Systems, Trichy.