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Moisture equivalent, field capacity, and permanent wilting percentage and their ratios in heavy soils

Moisture equivalent, field capacity, and permanent wilting percentage and their ratios in heavy soils

Agric Engineering 15(10): 355-362

Values for moisture equivalent (M.E.), field capacity (F.C.), and permanent wilting % (P.W.P.) for heavy clay soils are shown, and methods of determining F.C. and P.W.P. are described. In the clay adobe soils described, the M.E./W.P. ratio of the av. 0-3 ft. depth is 2.15, which increases with soil depth. M.E. and F.C. are not synonymous in the 0-3 ft. av. F.C. equaled only 0.83 of the M.E. The F.C./P.W.P. ratio of the 0-3 ft. depth is 1.76 very near Briggs' and Shantz' figure of 1.84 for this relationship; it decreases with soil depth. Results indicate that soil moisture constants derived for any particular depth of soil cannot be applied exactly to any other horizon. The F.C./P.W.P. ratio is less subject to variation than the M.C./P.W.P. ratio.[long dash]12. A. Work.

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