Growth of recognized eucalyptus hybrid (Eucalyptus urophylla  Eucalyptus pellita) clones at some plantation models

Abstract

The four Eucalyptus plantation models were planted in 2014 in Yen Bai, Ha Noi, Bac Giang and Binh Dinh provinces with five Eucalyptus hybrid (E. urophylla  E. pellita) clones recognized as technically advanced varieties: UP35, UP54, UP72, UP95, UP99. The survival rates of all plantation models were >90% after 36 months. At all models, there were significant differences in diameter at breast height and height between the UP clones and other clones.
The productivity of UP35, UP54, UP72, UP95, UP99 clones ranged from 20.52 to 28.58 m3/ha/year while the productivity of PN14, U6, U891 clones and Eucalyptus seeds achieved 13 to 15.87 m3/ha/year at age 3 years. At Ba Vi
(Hanoi), fertilizer treatment had significant effects on diameter at breast height, height and the productivity of 3-year-old plantation. The fertilizer application with basal fertilizer of 400 g Fused Calcium Magnesium Phosphate + 40g Potassium fertilizer; top - dressing fertilizer of 45 g Nitrogen Fertilizer Urea per tree (after planting 1 months), 90 g Nitrogen Fertilizer Urea per tree (after planting 3 months), 130 g Nitrogen Fertilizer Urea per tree (after planting 12 months) had the highest productivity (31.5 m3/ha/year); the common fertilizer application had the lowest productivity (23.4 m3/ha/year).