Research On The Effects Of Fertilization Upon The Growth Of Eucalyptus On Huangmian Forest Farm

Huangmian forest farm is located in the area of northern Guangxi where is suitable for planting eucalypt.It's climate and soil conditions and cultivation center are differences.This article were determined for 5 consecutive years of test and investigation on Huangmian forest of eucalyptus fertilization experimental forest.Test to analyze different species of fertilization and fertilizing amount on eucalyptus tree height,DBH and volume per unit area.And the fertilization costs and benefits were analyzed.The main results are as follows:1?The type and application rate of fertilizer significantly influence the growth of tree height?DBH.Judging from the first year of tree height and DBH growth,treatment 5?treatment 6?treatment 3 and treatment4 which set of base fertilizer is the best(treatment 5?treatment 6 contain N 5%,P2O5 10%,K2O 5%basal with compound fertilizer of 1000 g/strain,and treatment 3?treatment4 contain 18%P2O5 phosphate 1000g/strain).While the amount of basal fertilizer few treatment 2 and treatment 1(500g/strain)of tree height and DBH growth significantly worse.Treatment 5 and 6 is better than that of treatment 4 and 3,this illustrates that in the top dressing under the same conditions,the use of compound fertilizer as basal manure is better than only use phosphate fertilizer as basal manure.2?Top dressing also significantly influence the tree height,DBH and volume growth.When topdressing amount(top dressing use compound fertilizer 750g/strain)in treated group 4 and 5,their tree height,DBH and volume are better than topdressing amount less(top dressing use compound fertilizer 500g/strain)treated group 2,3 and 6.Don't grow well is treatment 1 without topdressing.When topdressing for first years lay stress on the N fertilizer,treatment 3,4,5 and 6 than treatment 2 growth well.This shows that topdressing amount(750g)and more weight in the first year of N fertilizer on eucalyptus tree height?DBH and volume can significantly promote the growth.3.Each dealing with net growth of the maximum value of tree height and DBH is in the second year.While the maximum volume of added value of the net is in the third year,and then gradually decreased.From 1?5 years the results of variance analysis,although the variance of tree height,DBH and volume per unit area in each of the analysis of differences in fertilization treatments had significant or extremely significant level,but the tree height net growth in fifth years?the annual net growth of DBH in fourth and fifth years fertilization treatments were not significant.This suggests that the late effects of fertilization on the tree height and DBH reduction.4.In terms of fertilizer costs and benefits,treatment 5 cost is the highest(13920.00 yuan/hm2),but the fertilizer efficiency is not the highest(61712.77 yuan/hm).Treatment 4 fertilizer cost is 12720.00 yuan/hm2,but its fertilizer efficiency is the highest of the 6 treatment,reached 71326.89 yuan/hm2.Thus for the purpose of this test,treatment 4 fertilizer efficiency is the best.