Productivity and economic efficiency of acacia hybrid and eucalyptus hybrid planting on the high embankment of acid sulphate soil at Hon Dat district, Kien Giang province
Keywords:
Productivity, economic efficiency acacia and eucaplyptus,, Kien Giang provinceAbstract
This study is part of the result of the project "Producing technically advanced varieties of acacia hybrid, Acacia auriculiformis and eucalyptus hybrid which have been recognized planting on acid sulphate soil in Kien Giang province to provide raw materials for processing artificial boards”. Planting density experiment for acacia hybrid (clone AH1) cutting seedlings and hybrid eucalyptus (clone UE24) seedling made by tisue cultured were established from August 2016 on the embankment of block 10, Binh Son commune, Hon Dat district, Kien Giang province belongs to the forest area of MDF VRG Kien Giang Joint Stock Company. There are 4 different planting densities were applied: M1 = 1,250 trees/ha (1.5 × 2 m); M2 (2 × 2 m); M3 (2 × 3 m) and M4 (2 × 4 m). Evaluation results at 6 years old showed that: The highest yield of acacia hybrid is the density of 3,333 trees/ha, reaching ≈ 48.0 m 3 /year/ha, the density of 2,500 trees/ha reaching 44.3 m 3 /year/ha, the density of 2,500 trees/ha reaching 44.3 m 3 /year/ha, density 1,667 trees/ha reaching ≈ 38.6 m 3 /year/ha and density of 1,250 trees/ha reaching 31.4 m 3 /year/ha; The highest yield of hybrid eucalyptus at density of 3,333 trees/ha, reaching ≈ 51.4 m 3 /year/ha, the density of 2,500 trees/ha reaching 49.3 m 3 /year/ha, the density of 1,667 trees/ha reaching ≈ 41.07 m 3 /year/ha and the density of 1,250 trees/ha reached 36.8 m 3 /year/ha. The growth and yield of hybrid Eucalyptus higher than that of acacia hybrid at the same planting density and both species are suitable for afforestation on the embankment in the study area. The results of economic efficiency analysis show that planting density of 2,500 trees/ha is optimal for the best economic efficiency: Acacia hybrid with density of 2,500 trees/ha has NPV ≈ 55.0 millions VND; IRR ≈ 33% and BCR ≈ 2.8 times; Eucalyptus hybrid density 2,500 trees/ha with NPV ≈ 54.9 millions VND; IRR ≈ 32% and BCR ≈ 2.7 times
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