Spatio-Temporal Water Deficit Estimation of Sugarcane in Thailand

  • Pawattana C.


The purpose of this study was to develop a model for estimation of spatio-temporal water deficit of sugarcane. GIS-based data of average weekly rainfall and potential evapotranspiration were interpolated using cokriging technique together with Gaussian model. The Soil Conservation Service (SCS) model was employed to compute runoff. Then, water deficits of sugarcane were determined by subtracting actual evapotranspiration from weekly effective rainfall. The calculation of sugarcane water deficit for the verified field was 630 mm over the growing season. The developed model was tested results with recorded data. The result revealed that total water supply into the verified field over growing season in 2010 was 775 mm in depth, which was 23% difference from the measured data.