Effects of micronutrients on the growth of Eucalyptus urophylla

A fertilizer experiment was carried out to study the effects of micronutrients on the growth of Eucalyptus urophylla on a seriously eroded hilly land where soils are developed from granite. Results showed that deficiency of micronutrients had a negative effect on tree growth of E. urophylla incoordinately, especially while boron (B) was absent. Tree height and DBH growth under all nutrients treatment had 73.5% and 130.2% higher than those in the B deficient treatment at 4.5 years after planting, respectively. Without B application, tree grew very slowly and had very typical B deficient symptoms, such as bad tissue of young branches, emergence of multiple buds in axillary, and unusual growth of stems and branches.