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Soil Water and Chloride Redistribution Under Various Evaporation Potentials¹

ABSTRACT

To locate depth zones of evaporation, 30 cylinders containing 36 cm of Ida silt loam soil (initially wetted with 0.02N CaCl₂ to maintain flocculation and furnish chloride ions) were subjected to various evaporation potentials for several different time intervals. Cumulative evaporation, water distribution, chloride distribution, and thickness of a dry surface layer, if one developed, were recorded. The evaporation zones lay between the 0- and 7-cm depth, depending on the evaporation potential used, nominally 0.5, 0.75, 1.0, and 2.0 cm. 24 hr, and the duration, 1 to 25 days, of evaporation potential application.

Key Words: Vaporization depth and zone • surface dry layer thickness • thermal vapor movement • salt build-up, surface

¹ Journal Paper no. J-5593 of the Iowa Agr. & Home Econ. Exp. Sta., Ames, Iowa. Project no. 1276.

² Graduate Research Assistant, Professor of Soils and Physics, and Professor of Agricultural Climatology.

Received for publication February 14, 1967. Accepted for publication May 5, 1967.