Crop Water Requirement Estimation by using CROPWAT Model: A Case Study of Halali Dam Command Area, Vidisha District, Madhya Pradesh, India

This paper is focuses on analyzing the irrigation water requirement and irrigation scheduling of wheat crop for rabi season using 9 year (2005–2013) climatic data of Halali dam command area in Vidisha district of Madhya Pradesh state, India. The effective rainfall was calculated using USDA S.C. Method. Reference crop evaporation was calculated by meteorological data viz Temperature, Relative humidity and Sunshine hr which is collected from meteorological station Vidisha district. Four type of soils existed in command area are considered. Soil depth and physical characteristics viz maximum infiltration rate, moisture holding capacity are also considered for better crop yield and crop irrigation requirement. Crop coefficient Kc value was taken according to crop growing stages as per given by the FAO Technical Paper “Irrigation and Drainage paper No. 24”. Effective rainfall and crop water requirement was used for determining net irrigation water requirement. By considering the losses due to infiltration into the subsoil and conveyance losses, net irrigation water requirement was estimated. The total crop water requirement of wheat is 209.7 mm due to recurrence of rainfall. It is found that the irrigation scheduling graph of wheat in Loam soil (210) is present different from other Clay Soils 379, 399, 412, while respective clay soils are representing slightly difference from each other in aspect of irrigation scheduling