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Water Content Changes Following Irrigation of Bare‐Field Soil That is Protected from Evaporation
Author(s) -
Ogata Gen,
Richards L. A.
Publication year - 1957
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/sssaj1957.03615995002100040001x
Subject(s) - loam , field capacity , soil water , water content , irrigation , soil science , evaporation , environmental science , soil horizon , hydrology (agriculture) , geology , agronomy , geotechnical engineering , geography , biology , meteorology
Water content changes were measured in a field plot of sandy loam soil. Following basin irrigation with 35 cm. of water, the soil surface was sealed with a sheet of polyethylene and covered with 10 cm. of straw. The measurements were made over a 50‐day interval during the summer of 1955. It was found for this soil that the water content, W D , expressed in surface cm. of water in a surface layer of soil of depth D cm. could be closely related to the time T in days following irrigation by W D = (0.52 + 0.209 D + 0.00053 D 2 ) T ‐0.128 . The downward flow rate dW D /dT = v D , expressed in cubic cm. per sq. cm. per day, as related to depth, and time is obtained by differentiation of the water content equation. Hydraulic head values in the field soil were measured. The capillary conductivity values calculated from the field data were found to be in agreement with values obtained previously by both laboratory and field methods for this soil.