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在辽西半干旱褐土上对紫苜蓿和沙打旺施用磷肥,能显著地促进生育,提高产量。有效磷含量高的过磷酸钙,施用当年的肥效比磷矿粉高;迟效性的磷矿粉施后第二年的后效作用大。两者当年的肥效和第二年的后效,均随施用量的增加而加大。每公顷的适宜施量过磷酸钙为300公斤,埃及磷矿粉为450公斤。
Phosphorus fertilizer on purple alfalfa and Astragalus adsurgens on semi-arid cinnamon soil in western Liaoning could significantly promote fertility and increase yield. The effective phosphorus content of superphosphate, fertilizer application of the year than the high phosphate rock; late effect of phosphate rock powder after the second year after the effect of large. Both fertilizer efficiency and the second year after-effects, both with the increase in the amount of increase. The suitable dosage for per hectare is 300 kg of superphosphate and 450 kg for Egyptian rock phosphate.