施肥对苜蓿＋无芒雀麦混播草地氮、磷、钾含量的效应

Effects of N, P and K fertilizers on content of N, P, K in individual species of Lucerne/Smooth bromegrass mixed grassland under different application rates were studied. The results show that the proper fertilization (9.0~13.5 g/m^2 N, 7.2~12.0 g/m^2 P2O5, 12.0~18.0 g/m^2 K2O) could increase the Content of N, P, K in Bromus inermis and Medicago varia cv. Caoyuan NO.2; N application could increase Bromus inermis' nitrogen content, but it had no significant influence on Medicago's nitrogen content; K application could increase Bromus inermis' potassium content and Medicago's nitrogen content, but it had no significant influence on Medicago's nitrogen content; P application decreased Bromus inermis' nitrogen content, but it had no significant influence on Bromus inermis and Medicago's phosphorus content. P and K application could increase Medicago's nitrogen content; High level K(27 g/m^2 K2O) and P(18.0 g/m^2 P2O5) fertilization could reduced the N Content of Bromus inermis. And high level N fertilization (20.3 g/m^2 N) could reduced potassium content of Bromus inermis and Medicago varia cv. Caoyuan NO.2.