Abstract
The continuous measurement of night-time ET a,n (sunset to sunrise), daytime ET a,d (sunrise to sunset) and 24h ET a,24h alfalfa evapotranspiration was carred out, using the Bowen ratio-energy balance method, in a closed mountainous semi-arid irrigated valley in northern Utah. The results indicate that ET a,n ET a,24 h was 2.93 mm 173.87 mm , or about 1.7%, during a complete growing cycle of alfalfa in August and September 1991. The results also show that this ratio could be very high (about 14%) when the night-time wind speed is high.
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