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采用压力膜法测定了单施磷酸二氢钾、单施草木灰和两者配施等3种钾肥类型在不同压力下的土壤质量含水率,拟合了它们在不同氧化钾含量的土壤持水曲线。结果表明,3种钾肥类型均降低了土壤的持水性,单施草木灰对土壤的持水力降低幅度最大,但采用两者配施对土壤持水力无显著影响,且施用量的多寡对土壤质量含水量的影响不显著。分析认为,钾肥类型应以草木灰与无机肥配施为好,施用量采用中肥水平即有效钾含量在100mg/kg左右,不仅避免连续大量施用无机肥对土壤结构的破坏,而且减小施用草木灰对土壤持水力的影响。
The soil moisture of three kinds of potash under different pressures, such as monopotassium phosphate monobasic application, single application of ash and their combination, were measured by pressure membrane method. The soil water retention curves of different potassium oxide contents were fitted . The results showed that all of the three types of potash decreased the water holding capacity of the soil, and the maximum decrease of water holding capacity of the soil with ash alone had no significant effect on the soil water holding capacity. However, The impact of water is not significant. Analysis shows that the type of potash fertilizer should be combined with ash and inorganic fertilizer is better, the application of fertilizer levels in the effective potassium content of about 100mg / kg, not only to avoid continuous large-scale application of inorganic fertilizer on the soil structure damage, and reduce the application of ash Impact on soil water holding capacity.