Title | Spatial variability of field-measured soil-water properties |
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Infiltration and redistribution of water following an irrigation was studied, and the work was replicated at 20 locations on a 150 hectare plot of land. Hydraulic conductivity was measured as a function of soil-water content at 30.5 cm depth intervals to a depth of 182.9 in twenty 6.5-meter-square plots randomly established over a 150-hectare field. Tensiometers installed at 30.5, 61.0, 91.4, 121.9, 152.4, and 182.9 cm were used to measure hydraulic gradients. Soil-water contents were ascertained from soil-water characteristics obtained from six soil cores taken from each of the above depths for each plot. Variations in soil-water content were found to be normally distributed with depth and with horizontal distance throughout the field, while values of the hydraulic conductivity were found to be log-normally distributed. The correlation between hydraulic conductivity during steady-state infiltration and the clay fraction was significant at the 1 per cent level. Several equations for predicting water movement and retention under field conditions are examined. |
Authors |
Nielsen, D. R. : Donald R. Nielsen was Professors of Water Science, Department of Water Science and Engineering, Davis
Biggar, J. W. : James W. Biggar was Professors of Water Science, Department of Water Science and Engineering, Davis
Erh, K. T. : Koon T. Erh was Postgraduate Research Water Scientist, Department of Water Science and Engineering, Davis.
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Publication Date | Nov 1, 1973 |
Date Added | Sep 17, 2014 |
Copyright | © The Regents of the University of California |
Copyright Year | 1973 |
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