An influence of changing the humic acids content soil water repellency and saturated hydraulic conductivity
2001
Babejova, N. (Slovak Academy of Sciences, Bratislava (Slovak Republic). Institute of Hydrology)
An influence of changing the humic acids content on soil water repellency and saturated hydraulic conductivity was studied on soil samples of Mollic Gleysol from Cilizska Radvan in the Danubian Lowland. Water repellency was measured with the water drop penetration time (WDPT) test on original soil samples and on soil samples with increased humic acids content. Saturated hydraulic conductivity coefficient was measured on the above-mentioned samples with falling head permeameter. From the results of measuring it follows that an increasing of humic acids content in soil resulted in an decreasing of the coefficient of saturated hydraulic conductivity of the soil under study. Original soil was non-water repellent soil. Already a small increasing of humic acids content in soil (in 17.9 % at original amount) caused that the soil became slightly or strongly water repellent in the average of soil moisture 15-30%. At soil moisture less than15% time of penetration decreased probably as a result of shrinking and cracking of the soil. Water repellency of soil samples from horizon 0-5 cm was usually higher than water repellency of soil samples from horizon 5-10 cm both in case of humic acids extracted from peat and in case of humic acids extracted from the same soil from Cilizska Radvan
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