Crop Water Estimation for Chaksu Tehsil of Jaipur using CROPWAT and GIS
Abstract
In this study, the estimation of crop water requirement was performed with the help of CROPWAT and ArcGIS for Chaksu Tehsil of Jaipur district. The monthly estimated ETo value from CROPWAT, ArcGIS and observed evaporation data obtained from the “Evaporation Control in Reservoirs (2006)” manual provided by the Government of India were compared for this model. The satellite data from MODIS satellite is used for the analysis of evapotranspiration (ETo). Net evapotranspiration data of MOD16A2 v006 is used in this study. CROPWAT 8.0 software used for ETo estimation which is based on Penman-Monteith equation. The penman-Monteith is a standard method used by Food and Agriculture Organization (FAO). CROPWAT is a computer programmed software used for the calculation of crop water requirement which is based on various factors like climate, soil, and crop data. The data which is used in CROPWAT 8.0 software are maximum temperature, minimum temperature, relative humidity, wind speed, daily sunshine hours. Daily data from January 2015 to December 2019 is used for this study for CROPWAT analysis and for ArcGIS the daily net evapotranspiration data is used from May 2017 to April 2019. Furthermore, season-wise evapotranspiration(ETo) is computed for the Rabi 2017-2018, Rabi 2018-2019, Kharif 2017 and Kharif 2018. Estimation of evapotranspiration and crop water requirement is essential for crops as it allows the development of irrigation schedule, and evaluate the crop performance on the basis of irrigated condition and rainfall condition. It also helps to evaluate the irrigation practice of farmers. The result obtained from this study can be used for irrigation management in Chaksu tehsil, considering minor and major crops of the area.
