The Effect of Fertilization on Young Clone Plantation for Eucalyptus urophylla

The fertilizer trial of young clone plantation for Eucalyptus urophylla has been established at Zhenghai Forest Farm in Kaiping of Guangdong Province.The results of trial at 4.5 year-old have showed that there are significant differences on growth among eight fertilizer treatments.Especially in No.4 treatment(N75P200K50),its superior to that of the other seven treatments of fertilizer with the mean height of 15.23 m,mean DBH of 11.07 cm,and volume of 107.5 m3·hm-2.There are significant differences between eight fertilizer treatments and the control treatment(no fertilizer).The mean height,mean DBH and volume per hectare of the best fertilizer treatment of N75P200K50 are respectively 1.3,1.65 and 3.1 times that of the control treatment(no fertilizer). The fertilizer treatment of N75P200K50 also has the best economic benefit with a ratio for input and output of 1 to 2.2 and a NPV of 25.96%.