Experimental Study On Effect Of Subsurface Drip Irrigation On Growth,Yield And Quality Of Alfalfa

This paper aims at the scientific problems of water and fertilizer coupling in the implementation of underground drip irrigation technology of alfalfa in ningxia.Based in ningxia hongsibao fuyang company alfalfa production base,Using the experimental method of contrast,orthogonal test,and the second general assembly design,we have studied the effects of subsurface drip and alfalfa on the growth(plant height,stem diameter,number of branches)?the yield and the quality(CP?ADF?NDF?RFV),as to provide theoretical basis for alfalfa water-saving irrigation in ningxia.The main research results are as follows:1.The method of single factor comparison,set up 7,10,13,16,19,22,25,28 m3/667m2,a total of eight irrigation quota,subsurface drip irrigation is studied different irrigation quota in impact on growth,yield and quality of alfalfa.Experiments show that with the increase of underground drip irrigation quota,alfalfa growth index,yield and quality of CP,RFV increase,ADF?NDF is less fiber.Comprehensive hay irrigation water,water production efficiency and production efficiency of the relationship between water demand and output growth falling gradient,the quality of ADF,potential evapotranspiration and crop coefficient index change rule,is recommended to hongsiBu area under the condition of water resources shortage of special and wet year,underground drip irrigation quota as 19 m3/667 m2,drip irrigation of 10 times,irrigation quota of 190 m3/667m2 of non sufficient irrigation system is advisable.At this point,the treatment 5 grass and hay yield of 1456 kg/667 m2?347.4 kg/667 m2,water production efficiency were 4.25 kg/m3?1.01 kg/m3,water demand is 513 mm,the quality of CP was 16.8%,acid ADF was 38.4%,NDF was 45.5%,RFV was 119.03%.2.By means of orthogonal experimental design method,set up the irrigation technology,irrigation quota and compound fertilizer amount three factors three levels,a total of 9 test processing,irrigation and sewage sludge was studied factors impact on growth,yield and quality of alfalfa,experiments on the various factors affect alfalfa growth index,yield and quality of primary and secondary factors,single factor change rule and the optimal combination of sewage sludge.Among them,the order of main and secondary factors influencing alfalfa yield is irrigation technology A(main)>irrigation quota B>compound fertilizer amount C(second);With irrigation quota increase from 6 to 18,the yield increased from 1058.47 kg/667m2 to1381.59 kg/667m2;With the increase of compound fertilizer from 2kg/667m2 tol0kg/667m2,the yield increased from 1289.99kg/667m2 tol231.75kg/667m2.In the three irrigation technologies,the underground drip irrigation increased by 22.9%and 45.2%respectively compared with surface drip irrigation and micro-injection.Factors influencing the yield of the optimal level combination for A1B3C3,namely the irrigation technology for underground drip irrigation,irrigation quota of 18 m3/667m2,compound fertilizer quantity is 2 kg/667m2 of alfalfa production is the largest,582.39 kg/667m2.3.It was study that that effect of irrigation quota,pure nitrogen amount,pure phosphorus amount and pure potassium content on the indexes of alfalfa growth index,quality and yield were study using the four-factor five-level secondary universal rotary combination design method.The regression model of each index and four factors was established,and the analysis led to four major factors affecting alfalfa's growth index,production and quality,single factor change law,interaction law and optimal water and fertilizer combination.Influence factors on that yield of alfalfa include:irrigation quota(primary)>pure phosphorous amount>pure nitrogen amount>pure potassium amount,the irrigation quota is very significant to alfalfa yield,and the remaining factors are not significant.According to the established fertilizer on yield index regression model analysis,it is concluded that under the condition of production is greater than 550.79 kg/667m2 optimal combination scheme for irrigation water quota of 18.84?19.8 m3/667m2,pure phosphorous of 1.48?1.65 kg/667m2 and pure nitrogen of 1.50-1.7kg/667m2,pure potassium of 8.38?9.49 kg/667m2.