Water requirement of wheat crop for optimum production using CROPWAT model
Krishna Deo, SR Mishra, AK Singh, AN Mishra and Ashish Singh
A field experiments was conducted during rabi seasons of 2014-2015 and 2015-2016 at the Agro met Farm, N.D. University of Agriculture and Technology, Kumarganj, Faizabad (U.P.) The treatment comprised of four levels of irrigation schedule Viz., I1 (critical stages), I2 (0.6 IW: CPE ratio), I3 (0.8 IW: CPE ratio), and I4 (1:0 IW: CPE ratio). The findings of present investigation indicated that the growth and yield attributes of wheat were significantly influence due to different irrigation schedule. The results, further revealed that growth attributes such as plant height (cm) and Leaf area index (LAI) were found significantly higher under I1 (critical stages) treatment. The highest grain yield (52.3 and 52.2 q/ha) and straw yield (65.8 and 66.9 q/ha) recorded under I1 (critical stages) treatment. The lowest grain yield (51.2 and 51.9 q/ha) and straw yield (64.4 and 65.3 q/ha) was recorded under I2 (0.6 IW: CPE ratio).Water requirement of wheat crop simulated by CROPWAT model was 237.8 and 266.9 mm for the whole crop season during 2014-15 and 2015-16 respectively. In initial stage minimum water requirement was simulated by model. The highest crop water requirement (130.7& 136.7 mm / decade) recorded in the late stage of growth which was 45.0 and 48.7% of total water requirement of wheat crop during the years 2014-15 and 2015-16. The phase wise reduction in Etc, yield and cumulative yield reduction was less in I1 (critical stages) as compared to other treatments.