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DocumentOther documentApplication of needle punch technique in bamboo-based medium density fibre board
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.The Fiber boards were prepared using D. strictus as lignocellulosic fibre and phenol formaldehyde (conc.8 %) as resin with three different pressures i.e. 14, 17.5 and 21 kg/cm2 for 15 minutes hot pressing at 150 0C. Simultaneously, needle punching treatments were applied on resin blended bamboo fibres during the mat formation i.e., one, two, three and four times punching. The physical and mechanical properties i.e. density, moisture content, water absorption, general swelling, surface absorption, modulus of rupture, tensile strength perpendicular to grain (internal bond strength) and screw withdrawal strength of both type (punching and non-punching) MDF boards were tested as per Indian Standard specification IS: 12406. The results revealed that the physical and mechanical properties of MDF board were significantly improved by needle punch technique and the board made from bamboo (D. strictus) using three-time needle punching with pressed at 21 kg/cm2 specific pressures were meet the requirements of Indian Standard specification IS: 12406. Keywords: Innovation ID: 3486104 -
ArticleJournal articleDesertification combating and ecological restoration of selected acacia species from sub-sahara, savanna regions
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.The Acacia species are widely distributed in the Sub-Sahara, Savanna regions and are of significant importance in terms of ecological remediation, afforestation programming, and economic value. Seed dormancy is common in Acacia species, and it creates difficulties in seed testing and planting. The initial aim of the current study was to assess the influence of a different temperature and different levels of water potential for germination based on the hydrothermal time models that had been successfully prophesying germination demand in several threat categories. Seeds of four Acacia species were treated at different temperature (15°C, 20°C, 25°C, 30°C and 35°C) and different levels of osmotic stress (0, -.4, -0.8, and -1.2 MPa). The results revealed that the degree of dormancy variation among the species, they were 81% for A. nilotica, 74% for A. seyal, 15% for A. mellifera, and 5% for A. senegal. Whereas, the optimal temperatures responded is 25°C for A. seyal, and A. senegal, A. nilotica, and 20°C for A. mellifera. Therefore, there are negative correlations appeared within germination percentages and water potential, . seyal, and A. senegal was displayed a drought-tolerant significantly lower levels of water stress. In contrast, A. nilotica and A. mellifera indicated less drought-tolerant of promoting water stress. Keywords: Acacia, Temperature, Water Stress, Hydrothermal Time, Germination, Drought, Restoration ID: 3618104 -
DocumentOther documentSucrose, photosynthetic photon flux density, & CO2 concentration affect growth & development of micropropagated mountain ash
XV World Forestry Congress, 2-6 May 2022
2022Also available in:
No results found.Mountain ash (Sorbus commixta Hedl.), is an important medicinal woody plant in Korea used for the treatment of cough, asthma, and other bronchial disorders. Unfortunately, the species is gradually disappearing due to over exploitation of the natural habitats. Tissue culture is a common and powerful technique for the clonal mass propagation which can be adapted to Mountain ash for ecosystem restoration. In an effort to establish a micropropagation method at the stage II for proliferation of shoots, Mountain ash was micropropagated under the so called a photo-autotrophic or photo-mixotrophic culture conditions. Micro-shoots of Mountain ash at the micropropagation stage II were cultured under two levels each of medium sucrose concentration (0 and 30 g.L-1), photosynthetic photon flux density (PPFD, 50 and 200 µmol.m-2.s-1), and CO2 concentration (350 and 1,000 µmol.mol-1). Axillary shoots originated from in vitro-grown plantlets, were stuck into and cultured on 50 ml per container of agar-solidified half-strength Murashige and Skoog (MS) medium with 2.0 mg.L-1 indole-3-butyric acid (IBA). Tissue water content, leaf length, and total chlorophyll content increased in plantlets cultured in the medium without sucrose (a photo-autotrophic condition). High PPFD promoted axillary shoot length, number of nodes, axillary shoot fresh weight, axillary shoot dry weight, leaf length, leaf width, and total chlorophyll content especially in the photo-autotrophic condition. High CO2 concentration increased axillary shoot length, number of axillary shoots, number of nodes, stem diameter, axillary shoot fresh weight, and axillary shoot dry weight. The treatment with a high PPFD, a high CO2 concentration, and without supplementation of sucrose to the medium (a photo-autotrophic condition) was better for growth and development in terms of number of nodes, tissue water content, leaf length, leaf width, and total chlorophyll content than those in the other treatments. Keywords: Research, Biodiversity conservation ID: 3622923
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