In order to identify effects of fertilizer solution concentration and biomass content on soil water infiltration characteristics in moistube irrigation where fermented peanut shell power was used as mixed biomass, a series of indoor soil box simulation experiments were performed. In the experiments, the fertilizer solution concentration was at three levels(F0-pure water: 0 mg/L, FL- low concentration: 200 mg/L, FH-high concentration: 400 mg/L), the mixed biomass content was at four levels(B0-natural air-dry soil: 0 g/kg, BL-low mixed content: 15 g/kg, BM-moderate mixed content: 30 g/kg, BH-high mixed content: 45 g/kg), and infiltration rate, cumulative infiltration, wetted soil volume and distribution characteristics of soil moisture were examined. The results indicate that the fertilizer solution concentration and mixed biomass content have a statistically significant effect on the initial infiltration rate, steady infiltration rate, cumulative infiltration and average content of soil moisture. Compared with the control treatment F0B0, increasing fertilizer solution concentration and biomass content has improved the initial infiltration rate by 13.02%-44.85%, the steady infiltration rate by 13.50%-48.78%, the cumulative infiltration by 5.65%-56.62% and the average content of soil moisture by 6.62%-30.09%, respectively. The cumulative infiltration in terms of time is accorded with Kostiakov model. The wetted soil volume increases with increasing fertilizer solution concentration and biomass content, and can be fitted with a quadratic polynomial of infiltration time. The cross-sectional area of wetted soil and the uniformity coefficient of moistube irrigation increase with increasing fertilizer solution concentration and biomass content.
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