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为了明确西北旱地种植苜蓿对土壤物理性状、水分和养分的影响,对其进行了较为详尽地探讨。种植苜蓿能增加土壤团聚体含量,提高土壤通气透水能力。苜蓿生长发育时需要大量消耗土壤水分,连续多年种植苜蓿会导致土壤干燥化;种植苜蓿能提高土壤有机质和氮素水平,降低土壤磷、钾含量。施肥既能平衡土壤养分又能增加产草量。
In order to clarify the effects of planting alfalfa on soil physical properties, water and nutrients in the dry land of Northwest China, it was discussed in more detail. Planting alfalfa can increase soil aggregate content and improve soil aeration and water permeability. When alfalfa grows and develops, it needs to consume a lot of soil moisture, planting alfalfa for many years will lead to soil desiccation; planting alfalfa can increase soil organic matter and nitrogen levels and reduce soil phosphorus and potassium content. Fertilizing both soil nutrients can increase the amount of grass production.