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[Objective] To study the effects of combined application of different elements on alfalfa hay yield.[Method] Potassium sulfate,ammonium chloride,superphosphate and magnesium oxide were applied to alfalfa field in the experiment,and quaternary quadratic regression orthogonal combination was used to examine the effects of the experiment factors on hay yield of alfalfa.[Result] The order of targets based on the effects on hay yield is as follows:potassium sulfate > ammonium chloride > magnesium oxide > superphosphate.Among them,the potassium sulfate had a significant impact on alfalfa hay yield.The interaction between potassium sulfate and magnesium oxide also had a significant impact on alfalfa hay yield.[Conclusion] The optimal cultivation measures for alfalfa hay yield of more than 19 224.6 kg/hm2 are as follows:potassium sulfate,163.253-181.679 kg/hm2;ammonium chloride,155.877-174.258 kg/hm2;superphosphate,566.177-632.924 kg/hm2;and magnesium oxide,30.060-33.628 kg/hm2.
[Objective] To study the effects of combined application of different elements on alfa alfa hay yield. [Method] Potassium sulfate, ammonium chloride, superphosphate and magnesium oxide were applied to alfalfa field in the experiment, and quaternary quadratic regression orthogonal combination was used to examine the effects of the experiment factors on hay yield of alfalfa. [Result] The order of targets based on the effects on hay yield is as follows: potassium sulfate> ammonium chloride> magnesium oxide> superphosphate. Ammong them, the potassium sulfate had a significant impact on alfa alfa hay yield. The interaction between potassium sulfate and magnesium oxide also had a significant impact on alfa alfa hay yield. [Conclusion] The optimal cultivation measures for alfa alfa hay yield of more than 19 224.6 kg / hm2 are as follows: potassium sulfate, 163.253-181.679 kg / hm2; ammonium chloride, 155.877-174.258 kg / hm2; superphosphate, 566.177-632.924 kg / hm2; and magnesium oxide, 30.060-33.628 kg / hm2.