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采用4因素(氮、磷、钾、硫),3水平进行苜蓿施肥试验,结果表明,施肥对苜蓿有明显的增产作用,尿素225kg/hm2、过磷酸钙562.5kg/hm2、硫酸钾675kg/hm2、硫磺粉75kg/hm2时产量最高分别为:14550,14550,13678.5,12789kg/hm2,分别高于对照28.3%,31.1%,20.6%,13.7%。施肥可提高苜蓿粗蛋白含量,硫酸钾的效果最明显:第一茬在225kg/hm2时粗蛋白含量为19.4%,高于对照27.9%;第二茬450kg/hm2时粗蛋白含量为20.1%,高于对照12.5%;施适量的氮、磷、钾可促进对其他养分的吸收。施硫磺粉对土壤养分没有明显的影响。施尿素、过磷酸钙、硫磺粉均能提高种植苜蓿经济效益,每公顷分别增值1476.9,1439.1,750.3元。
The experiment of alfalfa fertilization with 4 factors (nitrogen, phosphorus, potassium and sulfur) and 3 levels showed that the fertilization had obvious effects on the yield increase of alfalfa with urea 225kg / hm2, superphosphate 562.5kg / hm2, potassium sulfate 675kg / hm2 , And the highest yield of sulfur powder 75kg / hm2 was 14550, 14550, 13678.5 and 12789 kg / hm2 respectively, which were 28.3%, 31.1%, 20.6% and 13.7% higher than the control respectively. Fertilizer can increase the crude protein content of alfalfa, the most obvious effect of potassium sulfate: the first crop at 225kg / hm2 crude protein content of 19.4%, 27.9% higher than the control; the second crop of 450kg / hm2 crude protein content of 20.1% Higher than the control 12.5%; applied amount of nitrogen, phosphorus and potassium can promote the absorption of other nutrients. Application of sulfur powder has no obvious effect on soil nutrients. Apply urea, superphosphate, sulfur powder can increase the economic benefits of planting alfalfa, respectively, value per hectare 1476.9,1439.1,750.3 yuan.