Study on Soil Moisture Depletion Pattern of Wheat to Different IW/CPE Irrigation Schedulings

摘要

The present investigation was carried out to study on soil moisture depletion pattern of wheat to different IW/ CPE irrigation schedulings. This experiment was conducted on the field of the Wheat Research Unit, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola during the period from December to March in 2011-12 in randomized block design with five irrigation treatments and four replications. Irrigation was scheduled on the basis of climatological approach i.e. on IW/CPE ratios of 0.6, 0.8,1.0,1.2 and control treatment with six irrigations at critical growth stages of wheat, where the amount of irrigation water was estimated from Class-A pan evaporation data. Favorable soil moisture was maintained in the irrigation scheduling treatments ofIW/CPE=1.2 (1J and IW/CPE=1.0 (IJ throughout the growing period and it was always maintained in allowable depletion regime in both year. However, soil moisture was inadequate in irrigation scheduling at IW/CPE=0.6 (I). Highest water use efficiency was recorded in treatment I, in 2011-12 which may be due to lowest water use, followed by I3 and I4. Irrigation scheduling at IW/CPE=1.2 (1J recorded significantly highest grain yield 39.3 7 q/ha in 2011-12 as compared to rest of treatments. The results showed that the maximum yield of wheat was obtained in treatment I3 i.e. IW/CPE=1.0 under water saving irrigation strategy with maintaining favorable soil moisture throughout growing period.