Eastern Africa Maize Water Requirement Satisfaction Index 2014

The spatially explicit water requirement satisfaction index (WRSI*) is an indicator of crop performance based on the availability of water to the crop during a growing season. FAO studies have shown that WRSI can be related to crop productivity using a linear yield-reduction function specific to a crop (FAO, 1977; FAO, 1979; FAO, 1999). Later, Verdin and Klaver (2002) and Senay and Verdin (2003) demonstrated a regional implementation of WRSI in a grid cell based modeling environment. WRSI for a season is based on the water supply and demand a crop experiences during a growing season. It is calculated as the ratio of seasonal actual evapotranspiration (AET) to the seasonal crop water requirement (WR).
AET WRSI = --------------- * 100 WR

Read more here http://earlywarning.usgs.gov/fews/product/126 * Originally developed by FAO, the WRSI has been adapted and extended by USGS in a geospatial application to support FEWS NET monitoring requirements. References FAO, 1977. Crop water requirements. FAO Irrigation and Drainage Paper No. 24, by Doorenbos J and W.O. Pruitt. FAO, Rome, Italy. FAO, 1979. Agrometeorological crop monitoring and forecasting. FAO Plant Production and Protection paper No. 17, by M. Frère and G.F. Popov. FAO, Rome, Italy. FAO, 1999. Early Agrometeorological crop yield forecasting. FAO Plant Production and Protection paper No. 73, by M. Frère and G.F. Popov. FAO, Rome, Italy. Senay, G.B. and J. Verdin, 2003. Characterization of Yield Reduction in Ethiopia Using a GIS-Based Crop Water Balance Model. Canadian Journal of Remote Sensing, vol. 29, no. 6, pp. 687-692. Verdin, J. and R. Klaver, 2002. Grid cell based crop water accounting for the famine early warning system. Hydrological Processes, 16:1617-1630.

Data and Resources

Additional Info

Field Value
Last Updated July 23, 2019, 15:17 (CDT)
Created July 23, 2019, 15:17 (CDT)
GUID 128b81bd-4d46-400f-a358-15ba75885537
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contact-email pedreros@usgs.gov
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metadata-date 2018-07-17T09:35:29
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