Estimation of Cassava Water Requirements by using Geospatial Data in Chon Buri, Thailand
Abstract
Agricultural, crop water requirements are significant with the one of the most crucial factors in crop cultivation. The main water is used by plant’s foliar transpiration and soil evaporation also known as “Evapotranspiration”. The water planning and management by the use of water efficiency and decrease crop damage from a water shortage is applied. This study is aimed to using the Sentinel-2 satellite imagery for determining the crop coefficient (Kc) and best fit correlation between the vegetation indices (VIs) and crop coefficient (Kc) in order to estimation of cassava water requirements by using geospatial data in Chon Buri, Thailand. The methodology first, Reference investigation data from the Royal Irrigation Department's (RID) crop coefficients and Vegetation Indies of NDVI, GNDVI, SAVI, and NDRE obtained by the Sentinel-2 image were determined. Second, the Kc was generated by linear regression analysis. Then, evapotranspiration of cassava (ETc) was estimated by the Penman-Monteith equation. The study found: the evapotranspiration of cassava varied with plant age, from 1 to 12 months were 1.21, 1.23, 1.07, 1.52, 1.98, 2.29, 3.33, 3.69, 3.36, 2.86, 2.03, and 1.51 mm/day, respectively. The estimated values were quite near to the real values which RMSE = 0.15 indicated that the estimations were of significant and reliable correlates.
Keywords : Crop Evapotranspiration ; Crop coefficient ; Reference crop evapotranspiration ; Penman-Monteith ; Geospatial data (Cassava)
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