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Predicting Hysteretic Effects in Evaporation from Bare Soil¹

ABSTRACT

Evaporation losses from initially dry soil moistened by simulated rainfall were computed on the assumption that the soil water pressure on drying was uniquely predicted by either the wetting or drying boundary curve of the hysteresis function. In other words, hysteretic effects involving detailed drying scanning curves were neglected. The results showed that computed evaporation losses based on the two unique curves were nearly equal, and that these losses were only about one-half of those established previously both by evaporation measurement and by computations based on the appropriate scanning curves. It is concluded that hysteretic effects cannot be neglected or estimated by a simple averaging procedure in predicting water conservation in summerfallow under semiarid conditions.

¹ Contribution from Agriculture Canada, Ottawa, Ontario, K1A OC6.

² Soil Physicist. (Retired, formerly Agric. Canada, Swift Current, Saskatchewan, and Ottawa, Ontario). 2040 Prince Charles Road, Ottawa, Ontario, Can. K2A 3L1.

Received for publication December 5, 1978. Accepted for publication February 20, 1979.