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Effect of different types of biochar on the growth of Chinese cabbage (Brassica chinensis )
이재한,성창준,강성수,이호철,김수훈,임지선,김재홍,유준혁,박중현,오택근 충남대학교 농업과학연구소 2018 Korean Journal of Agricultural Science Vol.45 No.2
Biochar is the carbon solid produced through the pyrolysis of a biomass from organic sources such as agricultural waste, animal manure, and sludge under limited or anaerobic conditions. Biochar has the effect of reducing greenhouse gases through the carbon sequestration method; additionally, biochar is known to function as a soil amendment. This experiment was conducted to evaluate the application of biochar on the growth characteristics of Chinese cabbage at Chungnam National University in Daejeon, Korea. The Chinese cabbage was grown for 50 days in a glasshouse in pots. A pruning branch was used to produce the bead and pellet forms of biochar through pyrolysis. The biochar was added to the soil at 0, 2, and 5% by weight. The Chinese cabbage with the 2% treatment of the bead form of biochar had the highest fresh weight (149.43 ± 15.92 g plant-1) which was increased by 10% compared to the control (136.91 ± 31.46 g plant-1). Moreover, for the 5% treatment of the bead form of biochar (60.91 ± 9.82 g plant-1), the growth decreased by 57% compared to the control. As the content of the bead form of biochar increased, the shoot dry weight, leaf number, leaf length and lead width that appeared decreased. An increase in the total organic matter, Avail. P2O5, Ex. cation and EC was observed when the biochar content was increased. Our results support the application of 2% biochar in the bead form for increased growth of Chinese cabbage.
황지수,조성수,성창준,유경근,Hwang, Jisu,Cho, Seong Su,Seong, Chang Jun,Yoo, Kyoungkeun 한국자원리싸이클링학회 2020 資源 리싸이클링 Vol.29 No.4
Recycling processes of spent copper wires cosisnt of several steps of cutting and chopping processes for peeling covering materials followed by gravity separation processes, where copper is recovered. Because copper thin wires could be lost during further recycling processes, the wire may need to be further treated. In the present study, the copper thin wire was treated with ball milling to prevent the loss. Since the aggregation of the copper wire could be formed by bending and entangling the copper wire each other, the degree of flexion of the copper wire was measured after ball milling. When the 0.5 cm and 3 cm copper wires were used, the 0.5 cm copper wire was not bent and the 3 cm copper wires were aggregated regardless of the ball addition. When the 1 cm and 2 cm copper wires were used, the degree of flexion was remarkable when the balls were added. In the tests using 2 cm copper wires, the aggregation ratio of the copper wire gradually increased with the amount of the 20 mm alumina ball, and when 200 ml of 30 mm alumina ball was used, the aggregation ratio increased to 89.29 %, but after increasing the ball amount further, the aggregation ratio decreased. Thus, it is expected that the loss of the copper wire could be reducedif when the copper thin wire is treated with ball milling by the aggregation of copper thin wires.
Comparison of Characteristic of Food Waste Composting with Various Bulking Agent
Kyung-Rai Yeom(염경래),Soo-Hun Kim(김수훈),Hyung-Ji Song(송현지),Ye-Jin Kim(김예진),Chang-Jun Sung(성창준),Hye-Min Jung(정혜민),Yun-Goo Kang(강윤규),Ji-Sun Lim(임지선),Jae-Han Lee(이재한),Taek-Keun Oh(오택근) 한국토양비료학회 2017 한국토양비료학회 학술발표회 초록집 Vol.2017 No.10