Study on relativity between alfalfa′s yields and nutrition constituent effect of nitrogen,phosphorus and potassium fertilizer

Using 3414 quadratic regression optimum design,the effects of N,P,K mixed fertilizing on fresh forage yield and nutriention on alfalfa(Medicago Sativa)was conducted through orthogonal test from May to September in 2008 in Inner Mongolia.The results indicated that the best fertilization design was N 0 kg/hm2,P2O5 63.56 kg/hm2 and K2O 110.00 kg/hm2.And we screen out alfalfa of WL-232HQ as the most suitable planting variety for Tongliao region.At the same time analysied the effect of different fertilizer levels impact on nutrition constituent of alfalfa,the higher crude protein content was obtained with the fertilizer application treatment of N0P2K2,N1P1K2,N2P2K0,N2P1K2,N2P2K3.