PENGGUNAAN MODEL CROPWAT UNTUK MENDUGA EVAPOTRANSPIRASI STANDAR DAN PENYUSUNAN NERACA AIR TANAMAN KEDELAI (Glycine max (L) Merrill) DI DUA LOKASI BERBEDA APPLICATION OF CROPWAT MODELS TO ESTIMATE THE REFERENCE EVAPOTRANSPIRATION AND COMPOSING THE CROP WATER BALANCE OF SOYBEAN (Glycine Max (L) Merril) IN TWO DIFFERENT LOCATION
The objective of this research was to estimate the reference evapotranspiration (ET o ) for composing the crop water balance of soybean and planting schedules recommendation based on CROPWAT in Masgar and Terbanggi Besar area. soil physical properties used to compose the crop water balance of soybean by CROPWAT, and than compared with Thornthwite and Mather method. Crop water balance used to determine the plant schedules recommendation of soybean. Daily reference evapotranspirations (ET o )
... rations (ET o ) average in Masgar area was 3,7 mm and the monthly average was 111,1 mm. While the ET o daily average in Terbanggi Besar area was 3,4 mm and the monthly average was 102,7 mm. Plant schedules of soybean based on CROPWAT in Masgar and Terbanggi Besar area was February -April period with each other of crop evapotranspiration (ET c ) average was 260 mm and 223,2 mm. Crop evapotranspiration (ET c ) average of soybean based on CROPWAT more than less of Thornthwite and Mather method in once plant period. To utilize the land, it can be combined with other commodities. In Masgar and Terbanggi Besar, corn -soybean can be applied as cropping pattern.