Study on influences of fertilizer to growth of Acacia hybridplantation in Tam Thanh Forestry Company - Phu Tho province

Abstract

Study on influences of fertilizer to growth capacity and productivity of Acacia hybridplantation in Tam Thanh forestry company, Phu Tho province shown that controled experiment (non fertilizer) has the highest living rate in the first year and the fourth year with living rate is respectively 92,6% and 90,6%. While, living rate in experiments having NPK fertilizer only get from 82,6% to 90,6%. This result has caused by fertilizing so such NPK fertilizer leading to death a number of Acacia
hybrid. Growing capacity of Acacia hybridin the first experiment fertilizing 100g NPK + 400g Song Gianh organic microbial fertilizer and the second experiment fertilizing 500g Song Gianh organic microbial fertilizer have been the best effect to diameter growth at the fourth year with average
diameter (10,82 centimeter); the first experiment which fertilize 300g NPK and the second experiment fertilizing 100g NPK + 400 Song Gianh organic microbial fertilizer have been the best effect to height growth at four year with average heigh (10,52 meter). Base on real productivity, at the fourth
year, the second experiment fertilizing 100g NPK + 400g and the third experiment fertilizing 500g Song Gianh organic microbial fertilizer have been the most significant productivity, reach to over 18,9m3 perha per year, it is about 22% to 29% higher than controled experiment.