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Availability of Soil Water to Plants as Affected by Soil Moisture Content and Meteorological Conditions¹

Synopsis: Actual transpiration decreased with decreasing soil moisture content and increasing potential transpiration. Average soil suction in the root zone when the actual transpiration rate fell below the potential rate varied from 12 bars when the potential transpiration rate was 1.4 mm. per day to 0.3 bar when the potential rate was 6 to 7 mm. per day.

² Research Associate and Professor in Agricultural Climatology, Agronomy Department, Iowa State University, Ames, Iowa. Part of the work reported in this paper was performed by the senior author as a C.S.I.R.O. (Australia) overseas post-graduate student. He wishes to express his gratitude to C.S.I.R.O. for the assistance afforded him.

Received for publication December 20, 1961.

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