In this study,an ammoniated coconut bran powder(AM/CBP)water retention agent was prepared.Combining indoor basic tests with indoor soil environment simulations,water retention agents were applied to the soil at three dosages of 1%,5%and 15%(1%,5%and 15%AM/CBP-MIXED)to investigate the effects of water retention agents on the physical properties and water distribution of Lou soil in Shaanxi.Our study draws the following conclusions:1)The hydrophilic test shows that the contact angle of AM/CBP is 14.81°,indicating its excellent hydrophilicity;2)AM/CBP can reduce soil capacitance from increasing soil maturity and total porosity analysis.AM/CBP-MIXED can enhance the water content and saturated water content of soil under the same suction force,and this trend increases with the increase of the applied ratio.The residual water content conforms to this rule.The increase of soil water content in the three proportions of AM/CBP-MIXED from low to high is 0%～193.1%and 21.7%～381.7%and 31.6%～604.3%;3)The Rardern-Russo model can fit the soil water characteristic curves of water retaining agents accurately.5%is the most suitable application ratio in group of AM/CBP-MIXED,which has a larger field water capacity and total efficient water use,the lower unusable water,which is the best applied ratio.
维普
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