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NEW MEXICO CLIMATE CENTER |
Et = evapotranspiration or water used by crop.
y= 0.14 +0.12Et where y is metric tons/ha and Et is cm . The coefficient of determination is 0.78
The reference for this work is Sammis T. W. 1981. Yield of Alfalfa and Cotton as Influenced by Irrigation. Agronomy Journal 73:323-329
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