1Natural Resources Management Division, Central Island Agricultural Research Institute (CIARI), Port Blair-744 105, India
2Department of Applied Engineering, Vignan's Foundation for Science, Technology and Research (VFSTR) University, Vadlamudi-522 213, India
School of Civil Engineering, Vellore Institute of Technology (VIT), Vellore-632 014, India
*E-mail: bachina.harish@gmail.com
Online published on 19 September, 2020.
The aim of this paper is determining potential rice crop evapotranspiration (ETc) using satellite data in Godavari irrigation command area of Andhra Pradesh, India. ETc was estimated from reference evapotranspiration (ETo) and crop coefficient (Kc). ETo estimated using agro-meteorological data (measured maximum and minimum air temperatures) according to FAO-24 modified Blaney-Criddle method. The Kc maps were mapped in Arc GIS software using Normalized Difference Vegetation Index (NDVI). Red (R) and Near Infra-Red (NIR) measurements of MODIS image were used to calculate NDVI. Further, the ETc map was obtained by multiplying Kc map with the ETo map. The maximum ETc computed for Rice crop was 6.04 mm/day, whereas the minimum was 2.22 mm/day for the Godavari command area.
Crop coefficient, MODIS, Reference evapotranspiration, Remote sensing, Vegetation index
