• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 2000년도 하계 학술대회 논문집
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• pp.75-80
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• 2000

• 한국환경농학회지
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• 제42권4호
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• pp.353-357
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• 2023

This study evaluated the effect of lignin biochar on Kimchi cabbage cultivation in an upland field. Each of the inorganic fertilizers (IF, applied at 32-7.8-19.8 kg/10a=N-P-K), lignin biochar (LBC, applied at 1,000 kg/10a), improved LBC (LBC+N, applied at 1,000 kg/10a), and LBC+IF treatments areas were separated by a control (Cn) treatment area. The fresh weight of Kimchi cabbage increased in the order LBC+N > IF > LBC+IF > Cn > LBC treatments, and the length and width of the leaf were ranged from 20.8-25.7 and 13.7-15.8 cm/plant in all treatments. After Kimchi cabbage harvesting in the LBC+N treatment, soil quality improved bulk density, pH, OM, TN, and Av-P₂O₅ than those other treatments. In addition, the total N₂O flux in LBC+N LBC+N was lower than in IF treatments. Therefore, improved lignin biochar application effectively improves Kimchi cabbage cultivation and can benefit the agricultural environment.

• Journal of Biosystems Engineering
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• 제26권4호
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• pp.337-354
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• 2001

This study was conducted in order to develop a Chinese cabbage harvester attachable to tractors. For designing Chinese cabbage harvester in which laboratory and field tests were conducted with to determine feasible values design factors. To adopt the various sizer of C-cabbages, U-type soft rubber band was attached to the chain conveyor with an angle. Required torque of the conveyor axle was about 206-210kgf$.$cm. And the required peripheral speed of the disk cutter was 6.54m/s or more to have a clean session in root cutting. Three different harvest method were tested. The best harvesting method with minimum pulling force and damage was disk cutting flying just above the soil surface were the cut chinese cabbages are transferring to the holding conveyor attached soft rubber lug in prompt. Theoretical speed ratio of the tractor travel and feed of a chain conveyor was 1:1.2 with the attaching angle of 30 degree and 1:1.1 with the angle of 20 degree. Actual field experiment showed the speed ratio of 1:1.5 was the best because of the slip effect.

• 식물병과 농업
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• 제5권2호
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• pp.77-83
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• 1999

In 1997 surveys 82 out of 180 crucifer fields were infected with clubroot disease in a range of 1-100% of diseased plants and among crucifier crops Chinese cabbage was the most severe, In cropping systems Chinese cabbage-monocropping of Chinese cabbage-radish were found to be most common in major Chinese cabbage production areas. Welsh onion squash or paddy rice were also planted between cropping of Chinese cabbage. Paddy fields converted to upland were lowered in incidence of clubroot disease and fields with loam to silty loam soil were more severe in disease than those with sandy soil. Soil pH and organic contents were nor related to clubroot disease severity. Soil fauua such as total fungi bacteria actinomyces Pseudomonads and Bascillus were not correlated with severity of the disease. Root rall development on Chinese cabbage seedlings was initifially observed under a microscope 13 days after inoculation with Plasmodiophora brassicae but 18 days by naked eyes after inoculation. Root galls were formed mostly around collar roots and gradually spread to main root lateral roots and secondary root branches. Root galls started to enlarge greatly in size and weight from 23 days after inoculation. Chinese cabbage plants at mid-growth stage with root gall development were reduced to 1/2 of that of healthy plants in number of leaves 1/4-1/5 in above ground fresh weight 1/6 in root length but increased to 3 times in diameter of collar root. Diseased plants had little root hairs. Diseased Chinese cabbage plants at harvest were reduced by 9,1-11.8% in head weight compared to healthy plants a positive correlation was observed between root and head weight but those relationships were rot found in the diseased plants.

• The Plant Pathology Journal
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• 제19권1호
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• pp.64-68
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• 2003

Cruciferous vegetable crops grown in several locations in Korea were surveyed from 1996 to 2000. Clubroot severely occurred up to a maximum of 100％ in Chinese cabbage fields in 15 out of 42 locations, and in cabbage fields in 5 out of 13 locations surveyed. The disease also severely occurred up to a maximum of 40％ in radish fields in 6 out of 35 locations, and up to a maximum of 40% and 100％ in turnip and brown mustard fields in one each out of the few locations surveyed, respectively. The disease occurred less than l％ in one kale field in one out of two locations surveyed. A total of 268 isolates of Plasmodiophora brassicae was obtained from six cruciferous vegetable crops. The isolates were classified into 13 races based on their pathogenicity to the differential varieties of cabbage and rutabaga. There were 13 races found in isolates from Chinese cabbage, while 6 races each were found in isolates from cabbage and radish. There were five and three races found in turnip and brown mustard isolates, respectively. One isolate from kale was identified as race 8. Race 8 was the most frequently isolated from five cruciferous vegetable crops, except brown mustard. Races 3 and 14 were isolated only from Chinese cabbage.

• 한국식물병리학회지
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• 제2권2호
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• pp.96-101
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• 1986

총29점의 국내시판 십자화과 채소종자에 대하여 검은빛썩음병(흑부병) 감염여부를 종자세척액의 농축, 선택배지에 도말방법에 의해 조사한 결과 1점의 수입 양배추종자에서 검은빛썩음병균이 검출되었다. 몇가지 종자소독방법을 검토한 결과 옥시풀($3\3%$ 과한사수소수)에 30분간 침지함으로써 자연감염종자의 검은빛썩음병균을 소독할 수 있었다. 십자화과 채소재배포장에서 발병조사 결과 검은빛썩음병이 양배추에서는 매우 중요한 병해인 것으로 나타났다.

• 한국토양비료학회지
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• 제46권6호
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• pp.463-468
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• 2013

The level of nitrous oxide ($N_2O$), a long-lived greenhouse gas, in atmosphere has increased mainly due to anthropogenic source, especially application of nitrogen fertilizers. Quantifying $N_2O$ emission from agricultural field is essential to develop national inventories of greenhouse gases (GHGs) emission. The objective of the study was to develop emission factor to estimate direct $N_2O$ emission from agricultural field in Gangwon-do, Korea by measuring $N_2O$ emissions from potato (Solanum tuberosum), red pepper (Capsicum annum L.), and Chinese cabbage (Brassica campestris L.) cultivation lands from 2009 to 2012. Accumulated $N_2O$ emission was $1.48{\pm}0.25kg$ $N_2O-N\;ha^{-1}$ for red pepper, $1.27{\pm}0.27kg$ $N_2O-N\;ha^{-1}$ for potato, $1.49{\pm}0.06kg$ $N_2O-N\;ha^{-1}$ for Chinese cabbage cultivated in spring, and $1.14{\pm}0.22kg$ $N_2O-N\;ha^{-1}$ for fall Chinese cabbage. Emission factor of $N_2O$ calculated from accumulated $N_2O$ emission, nitrogen fertilization rate, and background $N_2O$ emission was $0.0051{\pm}0.0016kg$ $N_2O-N\;ha^{-1}$ N for cropland in Gangwon province. More extensive study is deserved to be conducted to develop $N_2O$ emission factor for upland crops in Korea through examining the emission factors from various regions and crops because $N_2O$ emission is influenced by many factors including climate characteristics, soil properties, and agricultural practices.

• 식물병연구
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• 제14권2호
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• pp.85-89
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• 2008

배추재배에서 뿌리혹병은 세계적으로 가장 문제가 되고 있는 병 중 하나이다. 본 연구는 배추 정식 후 관수횟수가 뿌리혹병의 발생 정도에 미치는 영향을 평가하기 위하여 폿트와 포장에서 실시되었다. 토양수분장력 별 시험에서 토양수분장력 별 관수횟수는 적을수록 발병도가 낮은 경향이었다. 상품수량은 0.06 MPa 처리구에서 10a당 5,306 kg으로서 다른 처리보다 증수하여 가장 경제적인 관수개시점으로 나타났다. 향후 적정 살균제 처리조합 혹은 저항성 품종 재식시의 관수 횟수에 대한 보강 연구가 필요할 것으로 보인다.

• The Plant Pathology Journal
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• 제34권4호
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• pp.297-307
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• 2018

The sugar beet cyst nematode, Heterodera schachtii is a well known pathogen on Chinese cabbage in the highland fields of Korea. However, a race of cyst forming nematode with close morphological resemblance to H. trifolii was recently isolated from the same Chinese cabbage fields. Morphological species differentiation between the two cyst nematodes is challenging, with only minor differences between them. Thus, this study described the newly intercepted H. trifolii population, and reviewed morphological and molecular characteristics conceivably essential in differentiating the two nematode species. A comparison of morphometric measurements of both infective juveniles and vulval cones of cysts showed significant differences between the two cyst nematodes. When total RNA and genomic DNA were extracted from a mixed field population, COI genes and ITS regions were clearly amplified with primers of the two Heterodera species, suggesting that Heterodera population collected from the Chinese cabbage field consisted of a mixture of two species. COI and ITS of H. trifolii were predominantly amplified from nucleotides prepared from H. trifolii monoxenic population whereas those of H. schachtii were strongly detected in H. schachtii monoxenic cultures. Thus, this study confirms the coexistence of the two species in some Chinese cabbage fields; and the presence of H. trifolii in Korea is reported here for the first time.

• 생물환경조절학회지
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• 제15권4호
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• pp.412-416
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• 2006

전자파 자기장 발생 장치를 개발하여 제작한 후, 이를 수경재배와 배지경의 양액 공급관에 장착하여 물에 자기장을 쬔 자화수 처리의 유무에 따른 수질 성분변화, 배추와 상추의 생장량 변화, 그리고 성분 변화를 분석하였다. 자화수 처리구는 무처리구에 비해 비타민 C 함량이 상추 2.8배, 배추 1.2배로 더 많았다. 또한 자화수 처리에 의한 생장촉진 효과는 상추의 수경과 배지경 재배에서 현저히 나타났으나 배추의 토경재배는 자화수 처리의 효과가 미미하였다. 따라서 토경재배 상추에서 자화수 처리에 의해 생장과 비타민의 함량을 높일 수 있을 것으로 기대된다.