Effects Of Fertilizer On Yield, Nutrition And Cation-Anion Balance Of Alfalfa

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 Yield,Nutrition and Cation-Anion balance(CAB).The cultueal mathematical model was set up by DPS.The relation between yield and convention nutrient content and cation-Anion balance were analized by computer.The following conclusions were thus obtained.1. Analysis of single factor indicate, potassium sulfate has effects on yield, reversely feeding value (RFV) and CAB of Alfalfa; ammonium chloride has effects on the content of acid detergent fiber(ADF),neutral detergent fiber(NDF) and RFV; superphosphate has effects on the content of NDF; magnesium oxide has effects on the content of crude fiber(CP),ADF and CAB.2. Analysis of interaction impact indication,the interaction which has a notable impact on yield is potassium sulfate and magnesium oxide; the interaction which has a notable impact on the content of CP is ammonium chloride and magnesium oxide; the interactions which has a notable impact on the content of ADF are ammonium chloride and magnesium oxide, superphosphate and magnesium oxide; the interactions which has a notable impact on the content of NDF are ammonium chloride and superphosphate, superphosphate and magnesium oxide; the interaction which has a notable impact on RFV is superphosphate and magnesium oxide; the interactions which has a notable impact on CAB are ammonium chloride and superphosphate, ammonium chloride and magnesium oxide.3. The best measure which can get high yield and quality and high CAB was potassium sulfate 153.2 kg/hm~2～157.4 kg/hm~2,ammonium chloride 158.3 kg/hm~2～174.2 kg/hm~2,superphosphate 158.3 kg/hm~2～174.2 kg/hm~2, magnesium oxide 26.4 kg/hm~2～30.0 kg/hm~2。The best measure which can get high yield and quality and low CAB was potassium sulfate 250 kg/hm~2, ammonium chloride 275 kg/hm~2, superphosphate 200 kg/hm~2, magnesium oxide 55 kg/hm~2.The yield of alfalfa is 29831.35 kg/hm~2,The CP of alfalfa is 20.77%,The RFV is 197.00,The CAB is 86.00 mmol/kgDM.