This study took Medicago sativa as the research object to explore the impacts of irrigation and biochar application on the actual production benefits of Medicago sativa from the perspective of nutritional quality and economic benefits. Four irrigation gradients （W₁ reduction of 30%： 450 mm， W₂ reduction of 15%： 550 mm， W₃ conventional irrigation gradient ： 650 mm， W₄ increment of 15%： 750 mm） and two biochar application levels （C₀：0 t·ha^-1，C₂：20 t·ha^-1） were set to determine the nutrient quality and annual hay yield of Medicago sativa and screen the best irrigation amount and biochar application amount. The results showed that under the condition of biochar application， the crude protein content of Medicago sativa showed an increasing trend， the neutral detergent fiber was significantly lower than that under C₀ treatment， and the dry matter intake rate and relative feeding value were significantly improved. The annual yield in W₂C₂ treatment was significantly higher than that in W₂C₀ treatment， superior to other treatments， and the annual net profit was the best， 22 422.93 CNY·ha^-1， which was 2148.53 CNY·ha^-1 higher than W₃C₀. Comprehensive evaluation showed that W₂C₂ treatment was the optimal irrigation and biochar application scheme to achieve the synergistic improvement of Medicago sativa yield， quality and economic benefits.

Medicago sativa  /  Biochar  /  Irrigation volume  /  Nutritional quality  /  Economic performance