Spatio-Temporal Analysis of Crop Water Requirement for Teff in the Nile Basin of Ethiopia: A GIS Approach

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Mohammad Afsar Alam, Zubairul Islam, Ravinesh Rohit Prasad

Résumé

Nile basin is a significant region of Teff cultivation in Ethiopia. This study aimed to measure crop water requirement for Teff. In this paper out of 175 districts in Nile basin 122 were identified as under primary region for Teff cultivation. To analyze Crop evapotranspiration for Teff, Reference evapotranspiration (ET0) was calculated using meteorological data of 14 weather stations by FAO Penman-Monteith method. Meteorological data were obtained from CLIMWAT database for CROPWAT. Crop evapotranspiration (ETc) was estimated using crop factor coefficient (Kc) values 0.3, 1.0, 1.2 and 0.7 for initial, development, and mid-season and late-season stages, respectively. Raster dataset was developed using values of Crop evapotranspiration by inverse distance weighted (IDW) model. Crop water requirements were calculated as the difference between crop evapotranspiration and effective rainfall. Getis-Ord Gi* statistic was used to identify statistically significant hot spots representing high or no crop water requirement. As a result, 37 Districts were identified in the high crop water requirement category with a 99 per cent confidence level. This research revealed that there is more than one-third area under Teff cultivation where irrigation is required. Hence, this study will help the planners to design the irrigation schemes accordingly. The results of this study will contribute significantly to enriching the current state of knowledge in the Spatio-temporal analysis of Crop Water Requirement for Teff crop.

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