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Previous studies have shown that long-term irrigation with wastewater can lead to the development of soil water repellency. Little is known about the longevity of this effect. Here we address this research gap by examining the effect of long-term (~20years) use of low-quality wastewater for disposal purposes, followed by 6years of ‘recovery’ with no irrigation, on the wettability of calcareous sandy...
Clay is an important factor that affects soil water repellency. The purpose of the present study was to assess the effects of clay content on contact angle and water drop penetration time (WDPT), and to examine their relationship. Model soils were prepared with silica sand and kaolinite, and hydrophobized using stearic acid (SA). The effect of kaolinite on the contact angle changed with the hydrophobic...
Fire usually induces water repellency (WR) in soils. Reduction in infiltration rates, increase of runoff and erosion are some of the consequences of WR in fire-affected soils. Most forest soils can develop WR by burning; however some previous observations in burned terra rossa soils have shown little changes in WR. Laboratory controlled experiments have been done with samples of terra rossa from 14...
The response of water repellency to added clays dominated by kaolin or smectite was investigated for 23 highly water repellent sandy soils from the West Midland Sandplains, Western Australia. The effects of soil properties, and wetting and drying cycles on this response were also examined. Two standard clays-Georgia kaolinite and Wyoming bentonite-were compared with two soil clays-Jarrahdale laterite...
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