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  • 1
    Online Resource
    Online Resource
    A Method to Select Plus Tree for Flower Purpose in Forestry
    Sciencedomain International ; 2019
    In:  Asian Journal of Research in Crop Science ( 2019-06-21), p. 1-8
    Details
    In: Asian Journal of Research in Crop Science, Sciencedomain International, ( 2019-06-21), p. 1-8
    Abstract: Plus tree selection is the first step to improve production and quality in forestry. An individual-based method is widely used to select plus trees for timber production, timber form, freedom from diseases and insects. In this study, a method to select plus trees for flower production is described and named as a crown-area-based method. Both individual-based and crown-area-based methods were used to select plus trees for Camellia impressinervis, a golden camellia; its yellow flowers have been used to treat sore throat and diarrhea, and to prevent cancers in China and Vietnam. Flower production of 21 concerned individuals was compared to the population mean and it was generated as a percentage. The population mean of the individual-based method is the mean of production of 21 trees as mean production/tree. While population mean of the crown-area-based method is mean production/m2 crown area (first production/m2 crown area for each tree was generated, then mean for population). The results indicated that both methods show seven individual trees with flower production 〉 100% population mean. However, individual trees are different. Only five of 7 trees are the same in both methods. The tree rankings by flower production percentage in both methods are totally different. The highest ranking by individual-based method (310% mean) is 4th ranking by crown-area-based method (181% mean). While the highest ranking by crown-area-based method (270% mean) is third ranking by individual-based method (260% mean). It is concluded that crown-area-based method is better in selecting plus trees for flower purpose, as it considers the crown area which is known as a productive part of a tree to form flowers.
    Type of Medium: Online Resource
    ISSN: 2581-7167
    URL: Article
    DOI: 10.9734/ajrcs/2019/v4i130063
    Language: Unknown
    Publisher: Sciencedomain International
    Publication Date: 2019
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Possible Planting Areas for Golden Camellia - Camellia impressinervis in Vietnam
    Sciencedomain International ; 2019
    In:  Asian Journal of Agricultural and Horticultural Research ( 2019-03-18), p. 1-7
    Details
    In: Asian Journal of Agricultural and Horticultural Research, Sciencedomain International, ( 2019-03-18), p. 1-7
    Abstract: Camellia impressinervis is known as a golden camellia, naturally distributing in China and Vietnam. Leaves and flowers of golden camellias contain active ingredients such as polysaccharides, polyphenols, saponins, and flavonoids. It was found to be able to inhibit the transplanted cancer, lower blood lipid, lower cholesterol, and prevent atherosclerosis. Market price of dry flowers of golden camellias in Vietnam is high, up to 700 US$/kg. This work was to identify suitable planting areas for C. impressinervis in Vietnam. Natural conditions, where C. impressinervis naturally distributes, were used for mapping, including elevation above sea level, annual precipitation, and annual air temperature. Each condition was classified to four levels as “very suitable”, “suitable”, “less suitable”, and “not suitable” for planting. Three corresponding digital maps were used for mapping. The results indicated that 72,781 ha accounting for 32.3% total land area of the study site was classified as “very suitable” for planting C. impressinervis. The “suitable” areas accounted for 34.2% and the not suitable areas accounted for 33.5% total land area. There was no area belonging to “less suitable”. It is recommended that C. impressinervis should be planted in “very suitable” areas and may be extended some to “suitable” areas. However, it should be widely planted only after carefully studying on cultivar selection, seedling production, and planting and tending techniques with consultation by local authorities.
    Type of Medium: Online Resource
    ISSN: 2581-4478
    URL: Article
    DOI: 10.9734/ajahr/2019/v3i330000
    Language: Unknown
    Publisher: Sciencedomain International
    Publication Date: 2019
    Location Call Number Limitation Availability
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Persian Walnut in Vietnam: A Potential Fruit Tree for Poverty Reduction
    Sciencedomain International ; 2019
    In:  Asian Journal of Advanced Research and Reports ( 2019-06-26), p. 1-8
    Details
    In: Asian Journal of Advanced Research and Reports, Sciencedomain International, ( 2019-06-26), p. 1-8
    Abstract: Persian walnut, Juglans regia L., is a long-lived, wind-pollinated and deciduous tree, which produces large, woody, shelled and edible nuts. J. regia is one of the most economically important cultivated species for timber and nutritious nuts. Its nuts have medicinal importance for human health by high antioxidant capacity. J. regia has been planted in Northern Vietnam for decades. In this study, a survey was conducted in three provinces to understand current planting sites and production of planted trees. The results indicated that J. regia was planted personally in gardens of local people in Lai Chau, Lao Cai and Ha Giang provinces, sharing borderlines with China. The planted trees are 10-30 years old with some exceptions of up to 40-50 years old. Generally, each household owns 2-3 fruited trees with some exceptions of up to 10 trees. After planting 7 years, trees fruit annually. However, the production varies among trees. A best 20-25-year-old tree can yield 55 kg fruits/year with current market price of 1.5 US$/ 1 kg fruits. There exists high variation of fruit production among planted sites, as results of climate difference, and unknown source and sexual propagation seedlings. It is concluded that to establish an extensive plantation of J. regia for high fruit production, selecting superior genotypes from local populations should be conducted, then vegetative propagation such as grafting should be applied to produce good and uniform seedlings.
    Type of Medium: Online Resource
    ISSN: 2582-3248
    URL: Article
    DOI: 10.9734/ajarr/2019/v5i130123
    Language: Unknown
    Publisher: Sciencedomain International
    Publication Date: 2019
    Location Call Number Limitation Availability
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    Online Resource
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