Raising a sandy soil's ability to retain more water is an important strategy to manage sandy soils. Combined application of biochar and slurry was hypothesized to be an appropriate strategy for improving soil hydro-physical properties. A two-season field trial was conducted by cultivating peanut (Arachis hypogaea L.) on a sandy soil under permanent overhead sprinkler irrigation. Rice straw biochar at 0, 10, 20 and 30 Mg ha⁻¹ and biogas slurry at 0, 5, 10 and 15 Mg ha⁻¹ were applied. Results indicated that all biogas slurry rates were more effective than biochar on improving all investigated parameters apart from infiltration rate and hydraulic conductivity which were higher with 30 Mg ha⁻¹ of biochar than with 15 Mg ha⁻¹ of slurry. Soil bulk density (g m⁻³) decreased significantly from 1.76 for the control to record 1.72 and 1.62 under biochar and slurry, respectively. Soil moisture contents at different tensions were the highest under the maximum combination rates, while biochar singly gave lower contents than slurry. The combined effect of 10 and 15 Mg ha⁻¹ biochar and slurry, respectively, surpassed their individual effects. With strong coefficients of determination (R² ranges from 0.88 to 0.98) and identical curves of estimated and predicted variables, it is possible to have accurate predictions for the changes in soil hydro-physical properties linked with different combinations of biochar and biogas slurry.

中文翻译：

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沙土水物理性质随生物炭和沼液改良剂的变化

提高沙土保持更多水分的能力是管理沙土的重要策略。假设生物炭和泥浆的组合应用是改善土壤水物理特性的合适策略。通过在永久性高架喷灌下在沙质土壤上种植花生 ( Arachis hypogaea L.)进行了两季田间试验。施用 0、10、20 和 30 Mg ha ^{-1 的}稻草生物炭和 0、5、10 和 15 Mg ha ^{-1 的}沼液。结果表明，除了渗透率和水力传导率外，所有沼气浆率比生物炭更有效地改善所有研究参数，其中生物炭30 Mg ha ^-1比 15 Mg ha ^-1更高浆液。土壤容重 (gm ^-3 ) 从对照的 1.76 分别显着降低到生物炭和泥浆下的 1.72 和 1.62。不同张力下的土壤水分含量在最大组合率下最高，而生物炭单独的含量低于浆液。10 和 15 Mg ha ^-1生物炭和泥浆的组合效果分别超过了它们的单独效果。凭借强大的决定系数（R ²范围从 0.88 到 0.98）和相同的估计和预测变量曲线，可以准确预测与生物炭和沼液不同组合相关的土壤水物理特性的变化。