Vol. 11, Issue 10 (2022)

A ratio of crop evapotranspiration (ETc) to reference evapotranspiration (ETO) determines a crop coefficient (Kc) value, which is related to specific crop phenological development to improve transferability of the Kc values. Development of Kc can assist in predicting crop irrigation needs using meteorological data from weather stations. The objective of the research was conducted to determine crop coefficient values of the soybean crop at research farm of Department of Agricultural Meteorology, College of Agriculture, and Parbhani during the Kharif season 2020-21. The research field was laid out in split-plot design with three replications and two factors viz. dates of sowing D₁ (25^th MW), D₂ (26^th MW), D₃ (27^th MW), and D₄ (28^th MW) and varieties V₁ (MAUS-158), V₂ (MAUS-71), and V₃ (JS-335). The total water requirement of the crop (ETc) was estimated during the life cycle of the crop was 546.4 mm. The Kc values were estimated to be 0.84, 1.33, and 1.60 for the initial, mid and final stage respectively.