Vegetos

Abstract

The onset date of south west monsoon in eastern U.P./central U.P. shifted to 19^th/20^th June from normal date 15^th June. Total rainfall in relation to onset of monsoon decreased by 6% if monsoon reaches on 19^th June in eastern U.P. as compare to rainfall of normal date (15^th June) and 9.5%if monsoon reaches on 25^th June. Consequent upon length of rainy season was also decreased from normal 108 days to 99 days in eastern U.P. whereas reduction in length of rainy season in other sectors of U.P. ranged between 12–13 days. Rainy day and rainfall intensity both reduced in all sectors of U.P. In eastern U.P. rainfall intensity reduced from 25 mm/day (1971–1990) to 17.2 mm/day (1992- 2011), i.e. 32% reduction hence crop planning may be made accordingly in respective sectors. Yield gap of crop has been calculated at particular amount of rainfall over the year of data with difference of maximum yield and minimum yield at same amount of rainfall. Variability of seasonal rainfall in different sectors of U.P. was also in same order and magnitude as that of total rainfall.