Water Requirement of Rice in Different Agro-Potential Zones Based on Aridity Indices by Using Geographic Information System

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Abstract: Aridity indices are widely used as an indicator of moisture availability for crop’s growth. Our main objective is to determine spatial variability of aridity in Punjab, Pakistan by using different aridity indices to calculate water requirement for Rice. Climate data of eighteen weather stations in all over Punjab were collected for 25 years (1991-2016). Reference evapotranspiration (ETo) was calculated by using Modified Penman Monteith method. Annual rainfall and annual ETo was interpolated by using Inverse distance weighted method in Arc GIS 10.3 software. Interpolated data were validated by Geo-statistical analysis, presented results with 99 % accuracy and Root mean square error was -0.00024. All aridity indices were calculated by using Raster calculations and mapped in GIS environment. Agro-potential zone maps based on aridity indices were developed by using Geographic Information System (GIS). Daily and monthly water requirement for Rice crop in all zones were calculated by multiplying ETo with Crop factor (Kc) values. Monthly water requirements for rice in Zone1, 2, 3, 4, 5, 6 were 816, 857, 798, 772, 770, 642 mm respectively. Optimum Seasonal water requirement for rice was 887 mm. This study will be helpful in predicting moisture availability and water need for Rice in all zones for farmers, field activity planners and policy makers.
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Archival date: 2020-08-05
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