Effects of Deficit Irrigation and Mixed Planting of Different Fall Dormancy Varieties on Nutritional Quality of Alfalfa
In order to explore the effects of deficit irrigation and mixed planting of different fall dormancy varieties on the nutritional quality of alfalfa,this study set up two different irrigation treatments,namely deficit irrigation(irrigation amount was about 75%of the quota irrigation,W1)and quota irrigation(W2),and set up seven monoculture and mixed planting treatments by using three different fall dormancy alfalfa varieties(WL354HQ,Xinmu No.4 and Sanditi,with fall dormancy levels of 3,4 and 5 respectively),namely WL354HQ monoculture(A),Xinmu No.4 monoculture(B),Sanditi monoculture(C),WL354HQ and Xinmu No.4 mixed planting(AB),WL354HQ and Sanditi mixed planting(AC),Xinmu No.4 and Sanditi mixed planting(BC),and all three varieties mixed planting(ABC).The results showed that compared with quota irrigation,deficit irrigation could increase the crude protein content of alfalfa by 6.56%and reduce the relative feeding value by 1.90%.Compared with WL354HQ of lower quality in the monoculture treatment,the four mixed planting treatments could increase the crude protein content and relative feeding value of alfalfa.Among them,the crude protein contents of the mixed planting treatment AB,AC and ABC increase by 3.95%,1.15%and 5.85%,respectively,and the relative feeding value increase by 4.04%,8.44%and 5.89%,respectively.
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