Abstract

Weighted-mean crop coefficients of wheat in 11 life zones of Saudi Arabia were estimated according to an FAO method. Evapotranspiration rates of wheat grown in these life zones were then computed using previously estimated reference rates of evapotranspiration. Leaching requirements of water ranging in salinity from 0·5 to 6·0 dS/m were calculated for sprinkler (pivot) and surface irrigation systems. Gross seasonal irrigation water requirements of wheat grown under both irrigation systems in these life zones were estimated for waters varying in salinity.

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