Effects of nitrogen，phosphorus and potassium on the DNJ yield of mulberry leaf in spring

In order to increase the 1deoxynojimycin(DNJ) yield of mulberry leaf in spring,3414fertilizer experiment design, the DNJ yield of mulberry leaf as objective function and fertilization level of N、P、K as regulatory factor, was utilized to survey the effects of different proportion of N、P、K on the DNJ yield of mulberry leaf, and simulate regression between them. The results showed the different proportion of N、P、K had significant effect on the DNJ content of mulberry leaf,and the DNJ content were significantly increased with the increase of simple fertilization amount,to the peak at the 2 level(N2P2K2). The optimum recommended fertilization parameters and the optimum economical yield were respectively achieved by the fertilizer effect function, 286.11 kgha-1 N、95.22 kgha-1 P2O5、159.62 kgha-1 K2O and 23.23 kgha-1.The optimum fertilization design after conformation in productive practice would provide references on the high yield and qualities of mulberry leaf in Sichuan hilly area.