种植苜蓿改良培肥地力的研究初报

Initial research report on soil fertility improvement by planting Medicago sativa

通过对种植苜蓿Medicagosativa后土地地力的测定,结果表明,种植苜蓿改善了土壤物理性质,土壤容重下降,孔隙度提高,土壤的颗粒结构更趋合理,水分渗透性土壤通气状况改善,提高了保肥蓄水功能。土壤养分发生变化,全N、有机质含量提高,速效K含量略有下降,全P含量较少。因此在生产中要增施P肥和K肥,提高产草量。

The experiment result shows that planting alfalfa has improved soil physical property; and soil volume weight has dropped. Soil porosity enhanced, soil pellet texture tended being more rational. Improvement of the permeability of soil moisture and aeration of soil enhanced the conservation function of soil fertility and moisture. Soil nutrient has changed. Total nitrogen and organic matter contents have increased, quick potassium content has reduced; total phosphorous has been small. In practice, it needs to pay attention to phosphate fertilizer and potassium fertilizer, so as to increase grass yield.Key words： Medicago sativa ; soil; fertility improvment