Abstract In order to research the effect of different irrigation methods and water quality on acidic soil water repellency, pH, salt and organic matter content, four kinds of low-quality water such as reclaimed water and diluted 2, 4, 6 times of reclaimed water were selected, distilled water as contrast, using reclaimed water for continuous irrigation as well as alternate irrigation with reclaimed water and distilled water to do red soil column infiltration exreriments for more than 1 year. Results show that induction of subcritical water repellency following different irrigation with reclaimed water, the contact angle of red soil under the continuous irrigation grew by an average of 23.1° as against alternate irrigation. Both irrigation methods increase the acidity of red soil as well as salt and organic matter content, and the growth rate under continuous irrigation is larger than that of alternating irrigation. In the continuous irrigation, the soil water repellency, pH, salt and organic matter content can be described by quadratic function with the change of water quality, and the determination coefficient is above 0.9. In the alternate irrigation, the relationship between red soil water repellency, salt and water quality can be described by quadratic function, and the determination coefficients are all above 0.9, but the soil pH and organic matter content have no obvious correlation between it. In the two irrigation conditions, soil water repellency is negatively correlates with pH, it is positively correlates with salt content, and it is negatively correlates with organic matter content in the continuous irrigation, while in the alternate irrigation it is opposite. The alternate irrigation with reclaimed water and distilled water can restrain the generation of soil water repellency.
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