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Predicting Hysteretic Effects in Evaporation from Bare Soil
Author(s) -
Staple W. J.
Publication year - 1979
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1979.03615995004300040030x
Subject(s) - evaporation , hysteresis , wetting , soil science , potential evaporation , environmental science , water content , materials science , geotechnical engineering , thermodynamics , geology , physics , composite material , quantum mechanics
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.