• 한국환경농학회지
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• 제35권1호
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• pp.1-5
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• 2016

본 연구는 생태계교란 식물인 가시박 방제 작업으로 발생한 가시박 바이오매스의 질소비료 대체재로써의 이용 가능성을 평가하기 위해 수행되었다. 서로 다른 생장 시기의 가시박시료를 채취 및 토양에 처리하여 무기태질소 함량과 상추 생장량의 변화를 분석하였다. 동일한 총 질소 당량의 가시박을 투입하였음에도 불구하고 토양 무기태 질소의 함량은 투입한 가시박의 생장시기가 어릴수록 증가하였고, 그에 따른 상추의 생장량 역시 가시박의 생장시기가 어릴수록 증가하는 경향이 나타나 무기태 질소와 상추 생장량 사이에 높은 양의 상관(r=0.9409)을 보였다. 종합해보면, 질소화학비료 대체재로써의 가시박의 이용 가능성을 실험을 통해 확인할 수 있었으며, 가시박의 물리적 방제 용이성과 가시박에 의한 질소공급효과 및 후작 작물의 생장 측면에서 가급적 어린 유묘 상태에서 가시박을 제거하고 그 바이오매스를 이용하는 것이 유리해 보인다. 하지만 자연 상태의 토양 내 가시박 종자들은 어느 한순간에 모두 발아되는 것이 아니라 시간 차이를 두고 2-4달동안 지속적으로 발아하는 현장의 특성을 고려해야 하며, 더하여 현장 적용 시 가시박 시료 분쇄 크기의 한계와 인력 동원 비용을 포함한 비용편익 분석 등의 후속 연구가 필요해 보인다.

• Journal of Biosystems Engineering
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• 제33권6호
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• pp.453-461
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• 2008

This study was conducted to develop a root-removed splice grafting system for cucurbitaceous vegetables, mainly watermelon and cucumber seedlings, for the seedlings factories where currently most of seedlings grafting works are carried out by manual works. The major results of the study are as follows. The dimensions of rootstocks and scions, except cotyledon width, of root- removed splice grafting of watermelon and cucumber were shown to be varied within the 2.5-fold range. The growth status of seedlings were not consistent in terms of cotyledon sprouting direction and angle which were considered as one of the important factors for in root-removed splice grafting. The grafting work of root-removed splice for grafted watermelon and cucumber could be divided by four sub-operations: seedling supplying, cutting, clipping and potting, while a part or all root of the rootstock was removed in the seedlings supplying operation. The cutting angles of the rootstock and scion were $34-45^{\circ}$ and $20-45^{\circ}$, respectively, while the stem length of the scion varied from 6 mm to 12 mm. The splices of rootstock and scion were heaped up in parallel and then fixed by a clip. It indicated that the ideal grafting system, adopting conventional grafting processes of seedlings specifications as well as conventionally manual root-removed splice grafting method, performed very well for seedlings gripping and transporting, supplying clip, clipping and discharging grafted seedlings while workers supplied seedlings to the semi-automatical system.

• 한국작물학회지
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• 제47권5호
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• pp.356-360
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• 2002

The seedlings of yacon (Polymnia sonchifolia Poeppig ＆ Endlicher), which were cuttings, plug seedling (PS), crown bud before sprouting (CBBS), crown bud after sprouting (CBAS), and divided seedling after budding (DSAB) were planted at 70$\times$50 cm planting distance on ridge; that was interow spacingintrarow spacing, and about 28,500$\pm$71 plants/ha. CBBS didn't need work and equipment to raise seedlings. PS and DSAB grew taller to 140.5 and 143.3cm, respectively, than others at 150 days after planting. In the changes of plant height, PS and DSAB showed taller than others during growth period, cuttings, CBBS, and CBAS grew rapidly in middle growth stage. Excepting main stem and petiole length, other characters were significant for seedling. Fresh weights were different among seedlings. Even though the yield of plants grown from CBAS and CBBS were lower with 34.7 and 36.4 ton/ha, respectively, than 3.6 ton/ha of DSAB; its yield index were over 95%, hence, those of plants grown from cutting and PS were lower with 73 and 87%, respectively. The ratio of tuberous roots over 200g to total tuberous roots per plant was the highest from DSAB. Most of tuberous roots were under 200g per tuberous root from cuttings. CBBS, CBAS, and DSAB are suitable to use seedlings for high yield of yacono. Yacon plant by DSAB much produced tuberous root of over 200g.

• 한국작물학회지
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• 제52권2호
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• pp.220-227
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• 2007

Sweetpotato fields in Korea are highly infected with virus and virus like diseases that greatly diminish both yield and quality as indicated by field observations and laboratory tests. In order to solve this problem, there is an urgent need to produce and mass propagate virus-free planting materials for distribution to the farmers. These experiments were conducted, firstly, to determine the most appropriate culture media, nutrient solution, and cutting intervals to maintain growth and vigor of tissue cultured plantleta as mother plants for propagation in insect-proof greenhouse. And as a labor saving method, the production efficiency of plug trays for rapid propagation of stem cuttings as a source of planting materials was likewise evaluated. Results showed that plants grown in medium B supplied with 0.5 and 1.0 strength of MS nutrients had high growth rate, and 20-day cutting interval was the best. 72-plug tray was better than 128-plug. Secondly, it was to develop a technique for the production of first-generation seed roots using hydroponics cultivation system. The yield of virus-free plants propagated in the non-insect proof and open-field cultivation was 2,402 kg/10a, 6% higher than those in the insect-proof cultivation, and the rate of virus re-infection was 18% higher compared to 3.3% with insect-proof cultivation. Lastly, it was to investigate the growth performance of virus free plants in farmers' field. Differences were existed in the yield depending on the variety used, but virus free plants showed an increase of $6{\sim}24%$ over virus infected plants.

• 한국식품조리과학회지
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• 제23권3호통권99호
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• pp.378-387
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• 2007

In this study, we investigated the application of HACCP for a prepared side dish of sweet potato stems, within a free meal service system for the elderly in the Sungnam area. Total bacterial counts (TBC) and levels of coliforms and Esherichia coli (E.coli) were analyzed through an eight step cooking process. The TBCs of the raw samples ranged between 3.30 and 1.37${\times}10^4$ CFU/g per 100 cm$^2$ The trimmed, blanched, and drained sweet potato stems showed a mean TBC value of 1.37${\times}10^4$ CFU/g, and the level of coliforms was 1.48${\times}10^3$ CFU/g. Among the eight samples, however, after stir-frying and serving, the TBC decreased to a standard satisfactory level, and a coliforms and E. coli were not found. A five step process was used and samples were taken to check the microbial quality of the cook and cooking equipment. Here we tested for TBC, coliforms, Staphylococcus aureus (S. aureus), and Salmonella. Specifically, the TBC and number of coliforms were examined on the cook's hand's, cutting board, and knife, as they represented hazards for cross-contamination. The three inspection steps of preparation of the trimmed, rinsed, blanched, and drained sweet potato stems, cook's' hands, cutting board and knife were all considered CCPs, and a manual of cooking process management was established to improve the risk factors in this study. In conclusion, this study reinforces that microbiological analysis is as a valuable tool for checking what points and stages of the cooking process must be controlled.

• 한국자원식물학회지
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• 제14권3호
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• pp.241-246
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• 2001

옻나무 근삽에 의한 묘목의 생산성을 향상시키기 위하여 7종류의 삽상배지를 공시하여 신초발생율과 묘소질을 조사하였다 삽상배지는 PV(peatmoss vermiculite = 1 : 1)와 PVS(peat moss : vermiculite : sand = 1 : 1 : 2) 처리구에서 3주 후부터 신초가 발생되었고, 삽 식 10주 후의 신초발생율은 PVSC(peatmoss : vermiculite : sand : clay loam = 1 : 1 : 2 : 2)배지에서 80%로써 가장 높았다. 삽수당 신초형성수는 PH와 PVC 삽상배지가 2.2개로써 가장 많았고 HSC 삽상배지 는 1.3∼1.5개로써 가장 적었으나 통계적인 유의차는 인정되지 않았다. Peatmoss, vermiculite, sand 및 clay loam을 각각 1:1:2:2 (v/v/v/v)로 혼합한 PVSC 삽상배지가 옻나무 근삽의 삽상배지로 이용하기에 양호하였으며, 수장, 분지수, 엽수, 경직경 및 엽면적 등의 묘소질 역시 양호하여 본포에 이식하기에 적당하였다.

• 한국유기농업학회지
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• 제8권1호
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• pp.89-99
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• 1999

To do mass multiplication of plug seedlings in potatoes, apical stem cuttings originated from virus-free microtubers were cut to one-two internodes and transplanted into the plug-tray. After 10days, we applied Chitosan and Wood Extraction on rooting and tuber formation of plug seedlings. To improve field adaptability of plug seedlings, rooted cuttings with a height of 20cm after 20days of cutting were transplanted ito the fields, We applied 500~2000ppm Chitosan on growth characteristics and tuber formation of that. The above and underground growths, such as plant height and number of leaves were significantly more vigorous after treatment with 500~1,000ppm Chitosan and 2,000ppm Wood Extraction, the spray treatment was carried out five times at intervals of four days after ten days of transplanting. T-N, K, P, Mg and Na, were higher as the concentrations of chitosan and Wood Extraction were higher. The growth and tuber yield in plug seedlings planting plot and seed potatoes planting plot were effectively highter as foliar application of Chitosan(500~2,000ppm) was done after planting the plot. T-N content in leaves and tuber was higher as the concentration of Chitosan was high. A similar tendency was shown in K, P and Mg. In the small tuber(under 30g), the number of tubers and tuber yield were relatively increased in the seed potatoes planting plot, but the large tubers(over 80g) yield was higher in the plug seedlings planting plot, and in order to increase tuber yield in plug seedlings it was necessary to add plant density to the field.

• 한국약용작물학회지
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• 제22권2호
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• pp.113-120
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• 2014

These studies were conducted to discriminate Cynanchum wilfordii, C. auriculatum, Metaplexis japonica, and Polygonum multiflorum by morphological characters. Cynanchum wilfordii, C. auriculatum, and Metaplexis japonica(Asclepiadaceae) were easily distinguished from Polygonum multiflorum by twining stem to the left, producing opposite leaves, having laticiferous stems and leaves at cutting cross-sectionally, and lacking lignification of the stem. Four species had different morphological characters of flower. Comparing four species to fruit type, three species of Asclepiadaceae had follicle, while Polygonum multiflorum had achene with three wings. Follicle shape was lanceolate, narrowly lanceolate, and widely lanceolate in C. wilfordii, C. auriculatum, and Metaplexis japonica, respectively. Whereas seed color of four species was dark brown similarly, seed shape and 1,000 seed weight were useful characters to discrimate between three species of Asclepiadaceae and Polygonum multiflorum. Shape and color of root were thickened and yellowish brown in C. wilfordii and C. auriculatum. They were thin and long and white in Metaplexis japonica, and fusiform and reddish brown in Polygonum multiflorum. They would be useful characters to distinguish Cynanchum spp., Metaplexis japonica, and Polygonum multiflorum, however, impossible characters to discriminate between C. wilfordii and C. auriculatum.

• 한국환경생태학회지
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• 제15권1호
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• pp.57-68
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• 2001

해안지역의 녹화 및 조경용으로 유용한 내염성 식물자원임과 동시에 서식지가 급격히 감소하고 있는 순기비나무를 대상으로 하여 생장특성과 번식방법을 규명하기 위한 연구를 수행하였던 바, 그 결과를 요약하면 다음과 같다. 1. 줄기의 생장형태는 포복줄기와 직립줄기가동시에 생장하고, 5개 주요 군락지에 직립줄기의 길이는 평균 46.6cm 이고, 포복경의 초대 길이는 7.6cm에 달하였다. 2. 종작발아율은 황적색의 무처리 종자와 $GA_3$처리 종자에서 71.0~72.3%로 가장 높았으나, 두 처리군사이에는 발아율의 차이가 없었다. 종피현화를 목적으로 한 황산처리는 오히려 종자의 발아를 억제하였다. 3. 종피 색깔이 황적생인 종자는 흑갈색 종자에 비해 평균 21.1%(13~30%)발아율이 높았다. 실득모율은 30% 미만으로 아주 낮았으나 흑갈색 종자에 비해 황적색 종가자 약 2배 높았다. 또한 $LD_{50}$은 황적색 종자가 흑갈색 종자보다 10~20일 짧았다. 4. 종피 색깔과 화학처리가 같은 조건에서 기건저장한 종자와 노천매장한 종자사이에는 발아율, 식득묘율, $LD_{50}$등의 차이가 없었다. 5. 기건저장한 황적색 종자가 바다모래에서 30.3%의 발아율과 10.1%의 실득모율을 나타냈으나, 갯벌흙에서는 전혀 발아되지 않았다. 6. 삽목번식의 경우 추삽에서 발근육은 녹지삽이 가장 높았고, 다음이 반지숙삽, 숙지삽의 순이었다. 발근율이 가장 높은 것은 NAA 200ppm+sucrose 2%를 처리한 녹지로서 96.7%의 발근율을 나타내었다. 발근수는 전반적으로발근율에 비례하는 경향이었다. 7. 하삽에서 NAA 200ppm+sucrose 2%를 처리한 녹지, 반숙지, 숙지의 토양별 발근율은 vermiculite+ perlite(1:1)와 마사토에서는 81.1~87.8%로 높았고, 모래와 해상에서 48.9~77.8%로 낮았다.

• 한국산림과학회지
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• 제70권1호
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• pp.1-6
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• 1985

주목(朱木)(Taxus cuspidata Sieb. et Zucc)의 휴안지삽수(休眼枝揷穗)를 1982년(年) 4월(月) 20일(日)에 온실내(温室內)와 포지조건(圃地條件)에서 삽목(揷木), 당년(當年) 10월(月) 31일(日)에 발근개체(發根個體)를 가지고 평균발근율(平均發根率)을 계산(計算)하여 통계분석(統計分析)하였다. 본(本) 실험(實驗)의 목적(目的)은 원예적(園藝的)으로 가치(價値)를 평가(評價)받고 있음에 착안하여 가장 합리적(合理的)인 삽목조건(揷木條件)을 찾아내는 데 있다. 결과(結果)를 요약(要約)하면 다음과 같다. 1) 온실내삽목(温室內揷木)은 포지삽목(圃地揷木)에 비해 평균발근율(平均發根率)이 높았다. 이것은 처리별(處理別)의 차이(差異)에 불구하고 같은 경향(傾向)을 나타내었다. 2) IBA처리구(處理區)는 무처리구(無處理區)에 비해 더 높은 평균발근율(平均發根率)을 보였다. 온실내삽목(温室內揷木)의 경우 IBA처리구(處理區)는 평균발근율(平均發根率) 86%, 무처리구(無處理區) 23%, 포지삽목(圃地揷木)인 경우 IBA처리구(處理區) 53%, 무처리구(無處理區) 11%이다. 이것은 모두 삽수장(揷穗長) 20cm, 그리고 사토배지(砂土培地)에 삽목(揷木)되었을 경우이다. 3) 삽목배지(揷木培地)로서 사토(砂土), 양토(壤土), 갈색토(褐色土) 중(中) 온실내삽목(温室內揷木)이나 포지삽목(圃地揷木) 공히 사토구(砂土區)가 가장 높은 발근율(發根率)을 보였다. 4) 삽수장(揷穗長)이 발근(發根)에 마치는 영향을 분석(分析)한 바 15~20cm가 발근(發根)에 적당하고 25cm 이상은 발근율(發根率)이 떨어지는 것으로 나타났다. 5) 고찰(顧察)에 의한 발근양식(發根樣式)은 삽수하단절단면(揷穗下端切斷面)에 켈루스세포괴(細胞塊)가 생기고 그 안에 근기(根基)가 만들어져 근계형성(根系形成)에 관여하는 경우와 삽수(揷穗)의 경부(莖部)에 측근(側根)모양으로 나타나는 불정근(不定根)의 경우이다.