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The Effects of N, P and K Fertilizer Applied in Leaf-producing Plantation of Camptotheca acuminata Decne

Wu Jiasheng, Ying Yeqing, Zhou Guomu, Shi Bolin(Zhejiang Forestry College, Lin’an 311300, P. R. China); Jiang Feng(Landscape Bureau of Quzhou City, Zhejiang Province); Zhang Haojie, Hong Zubing(the Forestry Bureau of Xianju County, Zhejiang Province)  
With three factors design of universal quadratic rotation combination, the models were established on the effects of N, P and K fertilizer on leaf yield of Camptotheca acuminata Decne. According to the testing results, the quadratic regression model had better simulation effect. Through the analysis of the main effect of fertilizer, it showed that N, P and K had different influences on leaf yield, and the influences were in such decreasing order as NPK. Two-factor interaction analysis showed that there was a positive interaction between N and K, N and P, P and K to some extent. By computer simulating, the optimum fertilization combination for leaf-producing plantation of Camptotheca acuminata where the fertility of soil was low on paddy soil was N 351.6~454.6 kg·hm -2 , P_2O_5 242.5~332.5 kg·hm -2 , K_2O 161.4~376.2 kg·hm -2 .
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