Research on Young Seedling Plantation of Fertilizer Trialfor Eucalyptus urophylla at 6 Year-old

The results on growths, biomass, nutrient contents and economic benefit of young seedling plantation for Eucalyptus urophylla at 6 year old by applying fertilizer were comprehensively summed up. The results showed that there was high significant increasing effect for young seedling plantation of E. urophylla. There were also high significant differences on growths of height, DBH and per hectare volume at year old between fertilizer treatment and no fertilizer treatment. Compared with no fertilizer treatment, fertilizer treatment on growths of height, DBH and per hectare volume increased by 34.76%, 56.80% and 206.59% respectively. Especially in No. 9 treatment (N-100,P-150,K-50,) with the mean height of 13.17 m, mean DBH of 13.73 cm and mean volume of 141.1 m3·hm-2,, it increased by 41.77%, 78.54% and 290.86% respectively. The best fertilizer combined ratio for N, P and K is 2:3:1. Fertilizer application can increase both the growths and biomass of each part for E. urophylla plantation. Fertilizer application also promoted absorb and utilization of each nutrient element for E. urophylla. In addition, reasonable fertilizer application also attained the considerable economic benefit. The net profit of No. 9 treatment with a total of 9 946.84 RMB·hm-2, at 6 year old was 9.58 times than that of no fertilizer treatment. A ratio of input and output and a IRR for No. 9 treatment (N-100,P-150,K-50,) are 1 to 2.74 and 32.33% respectively