Effects Of Alfalfa Production Traits And Soil Phosphorus Changes On Different Phosphorus Application Mode By Drip Irrigation In Oasis Of Northern Xinjiang

Sinkiang is in the state of active development of animal husbandry and alfalfa industry now.In the production of alfalfa the use of fertilizer is the main way to produce efficiently and thephosphate fertilizer can increase the content of total phosphorus in soil of alfalfa field but theoutput of alfalfa can still not be improved because the intake of available phosphorus is toolow.Hence this experiment studied two varieties of two-year-old alfalfa, namely Xinmu No.2and Suntory, through different models of fertilizing phosphate in typical oasis system ofShehezi.The test applied two-factor randomized design.Two factors were the content offertilizing phosphate and the method of fertilizing phosphate.The content of fertilizingphosphate was180kg/hm2and360kg/hm2respectively.And the method of fertilizingphosphate was separately three-time application and one-time application.Thus how much wefertilized was eaqual.We discussed the two varieties of alfalfa deeply through productionperformance, nutritional quality, soil fertility, phosphorus use efficiency and the balance ofsoil phosphorusAfter using fuzzy analogy preferred ratio method,we got the best fertilizationway which could improve production performance, nutritional quality and phosphorus useefficiency.And we evaluated the soil fertility. The main conclusions are as follows:1. The results of determining hay yield, leaf stem ratio, plant height and growth rateshowed that the four selected indexes could well reflect the production performance of twovarieties of alfalfa and were improved after fertilizing phosphorus.The total hay yields ofXinmu No.2(P<0.05) and Suntory (P>0.05)were improved through one-time application andseparately applying360kg/hm2phosphate fertilizer.The average leaf stem ratio of XinmuNo.2(P<0.05) and Suntory (P>0.05) was improved; Different contents of fertilizingphosphorus and methods of fertilizing phosphorus can increase the plant height and growthrate (P>0.05) of two varieties of alfalfa.By combining fuzzy analogy preferred ratio methodwith analysis of these four indexes we could know that separately applying360kg/hm2phosphate fertilizer was the optimum model of fertilizing phosphorus for improvingproduction performance of two varieties ofAlfalfa.2. The results of determining crude protein,crude fiber and crude ash showed that thethree selected indexes could well reflect the nutritional quality of two varieties of alfalfa andwere improved after fertilizing phosphorus.The average content of crude protein of XinmuNo.2(P<0.05) and Suntory (P>0.05) were improved through one-time application of180kg/hm2phosphate fertilizer.The average content of crude ash of the two varieties of alfalfa(P>0.05) was improved.The average content of crude fiber of two varieties of alfalfa werereduced through one-time application and separately applying180kg/hm2phosphate fertilizer(P>0.05). By combining fuzzy analogy preferred ratio method with analysis of these threeindexes we could know that one-time application of180kg/hm2phosphate fertilizer was theoptimum model of fertilizing phosphorus for improving nutritional quality of two varieties ofAlfalfa.3. The results of determining organic matter, available nitrogen, total phosphorus,available phosphorus and pH in the field soil and grading the soil fertility (standard forevaluation obeied the classification criteria of the second soil census) after completing theproduction showed that each treatment had no significant effect on soil fertility. 4. The results of determining phosphorus use efficiency of alfalfa and the balance ofsoil phosphorus showed that the fertilizing phosphorus enriched the content of phosphorus.One-time applying or separately applying180kg/hm2phosphate fertilizer could reduce theenrichment of the field soil.By fuzzy analogy preferred ratio method we could know thatseparate application of180kg/hm2phosphate fertilizer was the optimum model of fertilizingphosphorus for improving phosphorus use efficiency.5. By combining fuzzy analogy preferred ratio method with analysis of factors ofproduction (production performance and nutritional quality) and other main factors(soilfertility, phosphorus use efficiency and the balance of soil phosphorus) we could know thatone-time application of180kg/hm2phosphate fertilizer was the optimum model of fertilizingphosphorus in oasis system of Sinkiang.In the condition of not fertilizing phosphorus eachproperty of the Suntory was the optimum and in the condition of fertilizing phosphorus eachproperty of the Xinmu No.2was the optimum.