Cultivation of Dalbergia tonkinensis in North Vietnam
Keywords:
vườn hộ, form, growth, heartwood,, home garden, rosewood, seed,, seedlingAbstract
Dalbergia tonkinensis is a precious tree species of high economic value that in recent years is becoming popular in home gardens in Vietnam. The aims of this study were to assess the current status of seed resources and seedling production, the growth of trees in home gardens and plantations in 16 provinces in the North of Vietnam, and techniques for promoting heartwood formation. Survey results showed that D. tonkinensis seed in Vietnam have mainly been collected from mother trees in Vinh Phuc province and this has been supplemented with seed from scattered trees in other provinces. Seedlings produced in local nurseries reached 50.5 cm in height and 5.3 mm in stem diameter at five months of age. Seedlings from selected seed sources had superior growth and less disease than other seed sources. So far, the maj ority
of trees have been established in home gardens with 50 - 100 trees per garden. In plantations and home gardens, the highest average growth rate reached 1.5m/year in height and 1.6 cm/year in diameter up to 5 years of age. Trees in Son La, Bac Ninh and Ha Noi provinces had the best growth. Staking, pruning and thinning have been widely applied to improve stem form and growth. However, in Hoa Binh, Ninh Binh and Nghe An provinces 38 to 58% of trees were multi - stemmed. Canker disease was identified in all sites but the most serious impact was evident in Tuyen Quang and Phu Tho provinces. Techniques to promote heartwood development are being used: cutting 100% of branches + 50% of roots or cutting 100% of branches + transplanting. The present evaluation of techniques for seedling production, silviculture and
heartwood promotion provides a basis for the further planting of D. tonkinensis in Vietnam
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