CS(AR)-20/99-2000 : Planning of crop and water management practices using weekly rainfall data

Abstract

Weekly rainfall values have been estimated at various probability levels to determine rainfall deficit/surplus for planning of crop and water management practices and evaluating strategy to use alternative measures for irrigation and water management schemes in rainfed areas. To evolve a strategy for contingency crop planning and water management practices to promote crop production in rainfed areas, weekly probabilities, crop water requirements of all principal crops grown in the study areas were estimated and consistency of weekly rainfall distribution were analysed.

Estimation of weekly rainfall at various probability levels were carried out to determine rainfall deficit/surplus for cop planning. The rainfall data about 22 years(1977-1999) of Raichur and Koppal was analysed for estimating the weekly probability of rainfall at 60, 70, 75, 80, and 90% levels using statistical distribution. Rainfall deficit/surplus for different weeks were computed by comparing expected rainfall and consumptive use of all principal crops grown in the study area. The strategy to adopt proper cropping pattern and alternative measures have been suggested for all principal crops grown in the study area.