Experimental study on soil water repellency of volcanic ash soils: Effects of organic matter content and initial water content
2004
Kawamoto, K. (Saitama Univ. (Japan)) | Banyar, A.
Abstract We investigated the effects of organic matter content and initial water content on the degree of soil water repellency (WR) in Aggregated volcanic ash soils by using a series of tests of WR, namely, Water Drop Penetration Time (WDPT) test, Ninety Degree Surface Tension (NDST) test and capillary rise test. Results show that the degree of WR varied greatly with both organic matter content and initial water content, and that three distinct WR areas of 'Extremely WR area, "Transitional area, and 'Wettable area' were recognized in the scatter diagram obtained from WDPT test. In three WR tests, initial water content values that yield the highest degree of WR were found to be identically between WOPT and capillary rise tests, and the value obtained from NDST test was deviated from former two tests. The degree of WR in aggregated soil was closely associated with a soil structure and morphological features of water retention in aggregates. The degree of WR was enhanced mostly at the water content corresponding to a moisture condition at which water in intranggregate pores was drained to a moderate extent.
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