Water Requirements of Crops under Various K_c Coefficient Approaches by Using Water Evaluation and Planning (WEAP)

Prof. Dr. Sadeq O. Suliman

College of Engineering / University of Anbar

https://www.iieta.org/journals/ijdne/paper/10.18280/ijdne.150516

In this study, the Dual-K_c approach within FAO-56 paper was applied by water evaluation and planning (WEAP) to get the K_c parameters (K_cb and K_e) and to calculate the water requirement for various soil textures. The results compared with the outputs of Single-K_c approach for summer and winter crops in addition to trees. The results showed when applying Dual-K_c approach, the water requirements was more compared with the Single-K_c approach, except the tomato, eggplant, and Broad bean crop, which decreased by 5%, 4%, and 17% respectively. Also, there was a different in values of coefficient when compare two approaches, it was increased in Dual-K_c approach for wheat by 62% with 20% during initial and end-stage while ranged between 26-58% for trees during all season with more different for other winter and summer crops. The water requirement of crops was different according to soil texture. The net water requirement of wheat was 429 mm and 433 mm for sandy loam and clay loam respectively, with different in irrigation intervals 11 and 12 respectively, while the silt loam was recording water requirement 417 mm with 8 irrigation intervals.