Abstract
Agriculture is the main source of people's livelihood in the Kalahandi district of India. Agricultural activities in this region are dominated by rain fed rice and rice based cropping system. It suffers from water stress due to long breaks of monsoon (dry spells) during the crop growing season and erratic distribution of rainfall at different crop growth stages. Supplemental irrigation salvages the crops from drought like situations. In this study, Spatial and temporal drought characteristics were investigated using the Standardized precipitation index (SPI) at 1-, 2-, and 3-month time scales to provide guidance for agriculture practices. Supplemental irrigation demand at different crop growth stages of rice crop was estimated on a farm scale and spatially interpolated in GIS environment. Maps showing SPI at different time scales were then compared and correlated with the irrigation demand maps at different crop growth stages. The results indicated good correlation for 2-month and 3-month SPI with the irrigation requirement during the crop development and mid season stages of rice crop respectively.
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