RESUMO
OBJECTIVE: A field experiment was conducted to investigate the different effects of various applying ratios of nitrogen (N), potassium (K) and phosphate (P) on diosgenin content and Rhizoma yield of Dioscorea zingiberensis. METHOD: Experiment was conducted with both one factor and orthogonal design, and data was analyzed statistically on SPSS 11. 5. RESULTS: Compared with the control groups,the yield of rhizome was significantly increased by N (P < 0.01), K (P < 0.01) , P (P <0.05). The content of diosgenin has no obvious increase (P > 0.05) by individual application of N, P and K, while changed significantly (P < 0.05) by the combination of proper levels of N, P, K. CONCLUSION: The degree of effect on diosgenin content was ranged with N > K > P, while on output of dioscorea rhizome was K > N > P, and the combination of N, K, P2 was superior to others.