• Journal of the Korean Applied Science and Technology
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• v.36 no.1
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• pp.324-332
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• 2019

Most countries including Korea and Indonesia have strong policy for implementing biofuels like biodiesel. Shortage of the oil feedstock is the main barrier for increasing the supply of biodiesel fuel. In this study, in order to improve the stability of feedstock supply and lower the biodiesel production cost, the feasibility of biodiesel production using two types of Indonesian tropical crop oils, pressed at different harvesting times, were investigated. R. Trisperma oils, a high productive non-edible feedstocks, were investigated to produce biodiesel by esterification and transesterification because of it's high impurity and free fatty acid contents. the kindly provided oils from Indonesia were required to perform the filtering and water removal process to increase the efficiency of the esterificaton and transesterification reactions. The esterification used heterogeneous acid catalyst, Amberlyst-15. Before the reaction, the acid value of two types oil were 41, 17 mg KOH/g respectively. After the pre-esterification reaction, the acid value of oils were 3.7, 1.8 mg KOH/g respectively, the conversions were about 90%. Free fatty acid content was reduced to below 2%. Afterwards, the transesterification was performed using KOH as the base catalyst for transesterification. The prepared biodiesel showed about 93% of FAME content, and the total glycerol content was 0.43%. It did not meet the quality specification(FAME 96.5% and Total glycerol 0.24%) since the tested oils were identified to have a uncommon fatty acid, generally not found in vegetable oils, ${\alpha}$-eleostearic acid with much contents of 10.7~33.4%. So, it is required to perform the further research on reaction optimization and product purification to meet the fuel quality standards. So if the biodiesel production technology using un-utilized non-edible feedstock oils is successfully developed, stable supply of the feedstock for biodiesel production may be possible in the future.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.29 no.2
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• pp.118-127
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• 1984

In order to find an appropriate model for rice crop-season, the possibility to utilize the geographical conditions instead of meteorological factors was examined on the data from the Local Adaptability Test(LAT) conducted over the country from 1962 to 1980. The mutiple regression model, $Y={\Upsilon}={\ss}{\sum}_{i=1}^n{\beta}^1X^iwas applied on seeding, transplanting, heading and marginal heading date, and multiple regression coefficients(\beta) and multiple correlation coefficients (R) were tested. Two varietal groups, japonica(1962-l971) and indica/japonica(l972-1980) were separately tested. The application of these established models, growth duration in nursery and paddy field, cultural season, and the relation between heading date and yield are reviewed.

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 1999.04a
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• pp.100-103
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• 1999

열대 인도 지방이 원산지인 바실(Ociumu builicum L.)은 경제적으로 매우 중요한 작물로 전세계적으로 재배, 이용되고 있다 향을 함유한 잎은 생체 또는 건물로 과자나 음료 등에 향을 가미하기 위해 사용된다. 전통적으로 바실은 구풍제, 자극제, 진정제의 특성으로 민간요법에 이용되었다. 바실의 정유는 식품산업과 화장품에 이용되며 항균 효과도 지닌다. (중략)

• KOREAN JOURNAL OF CROP SCIENCE
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• v.56 no.3
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• pp.183-191
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• 2011

This study was undertaken to collect basic knowledge of Jatropha which is one of bio-energy crops, based on the understanding of physiological and molecular aspects under salt and drought conditions. The treatments were followed as: 100, 200 and 300 mM NaCl for salt stress and 5, 10, 20 and 30% PEG for drought stress for 8 days, respectively. Leaf growth, stomatal conductance, chlorophyll fluorescence and gene expression of aquaporin (JcPIP2) of Jatropha were investigated. From 2 days after treatments, plants treated with higher than 100 mM NaCl and 10% PEG respectively were significantly suppressed in leaf length, width, and stomatal conductance, but 5% PEG treatment showed that plant growth was improved more than control plant. Semi-quantitative RT-PCR analyses revealed that the JcPIP2 gene was expressed in root, stem, cotyledon and leaves. It was not detected in leaves at 200 and 300 mM NaCl treatments. However, transcripts of JcPIP2 were induced in roots and stems under salt and drought conditions compared to those of healthy plants. Therefore, it was concluded that JcPIP2 plays an important role in improving drought tolerance.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.31 no.4
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• pp.391-402
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• 1986

A total of 16 varieties from Korea and Indonesia were tested in Suwon, Korea (126$^{\circ}$9'E, 37$^{\circ}$16'N, 37m amsl) and Bali, Indonesia (115$^{\circ}$ 14'E, 8$^{\circ}$42' and 10m amsl). Most varieties of Indica and India/Japonica types showed adaptability to both areas. Generally Indica-type showed more number of panicles per hill than that of Indica/Japonica, while Indica/Japonica showed better performance in spike let number per panicle and 1,000 grain weight than Indica-type varieties.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2020.12a
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• pp.75-75
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• 2020

여주(Momordica charantia L.)는 인도 동부와 남중국 등 열대 아시아 지역이 원산지로, 열대 및 아열대를 비롯하여 온대 지역까지 널리 재배되며, 열매를 식용으로 하여 주로 채소로 재배되고 있는데, 쓴맛 때문에 '쓴오이' 라고도 부르지만 당뇨와 고혈압 등 성인병과 장 기능 개선 성분을 함유하고 있다고 알려지는 등 건강기능성 작물로 국내에서도 전국적으로 재배가 되고 있어서, 국내 재배현황과 재배농가의 실태를 조사하여 재배 애로사항 및 발전과제를 도출코져 하였다. 여주의 국내 재배는 2012년 재배면적이 10ha에서 빠르게 증가하여 2017년 606농가 107.9ha로 정점을 이루고, 점차 감소하여 2019년 232농가 59.9ha에서 재배 하였으며, 2019년 재배면적이 많았던 시군은 함양, 강진, 양주, 천안 등 이었다. 여주의 재배작형은 보통재배(육묘후 노지재배) 농가가 가장 많고, 노지재배(직파), 반촉성재배(조숙재배), 촉성재배 형태의 농가가 있는데, 보통재배(육묘후 노지재배)는 3월 하순~4월 상순에 파종 및 육묘한 후 5월상순 노지에 정식하여, 6월 하순부터 가을에 서리가 내리기 전까지 수확한다. 농가의 재배품종은 일본 등 외국도입종의 종자를 종자회사로 부터 구입하여 재배하고 있으며, 재식방법, 시비관리, 줄기유인 등 표준재배법이 정립되지 못하여 농가별로 다양한 방법으로 재배하고 있는 실정이다. 수확은 열매가 완전히 익기전에 생여주 상태에서 수확하고 있으며, 일반 재배농가는 생여주 판매가 10~20%, 건여주 판매가 80~90% 비율이며, 생여주로 100% 건조업체에 판매하기도 하고, 건여주로 100% 건조하여 판매하는 농가도 있다. 국내재배 안전성 향상을 위하여 필요시 되는 기술개발 과제는 용도별 품종육성 및 종자생산 보급, 고품질 여주 생산을 위한 재배관리 기술, 지역별 생산 여주과실의 성분 품질관리 및 건조 가공기술, 여주의 건강기능성 식품 지정 고시 방안 등으로 전문기관에서의 연구개발이 필요하다.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2022.09a
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• pp.52-52
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• 2022

제주도 서귀포시와 경북 안동시에서 사마풀속(Murdannia Royle)에 속하는 미기록 외래식물인 Murdannia nudiflora (L.) Brenan를 발견하여 보고하고자 한다. Murdannia nudiflora는 열대 아시아 원산으로 아프리카, 아메리카 대륙뿐만 아니라 우리나라와 가까운 일본에도 도입되어 있다. 종소명인 'nudiflora'는 본종의 조락하는 소포엽의 특징을 지칭하는 것으로 추정되며, M. nudiflora는 소포엽 외에 국내 자생하고 있는 사마귀풀[M. keisak (Hassk.) Hand.-Mazz.]과 뿌리, 꽃, 열매 및 종자의 외부형태로 쉽게 구분할 수 있다. M. nudiflora는 사마귀풀과 달리 뿌리줄기가 없고, 말단 혹은 액생하는 화서에 여러 개의 꽃이 피며, 꽃은 수술 2개, 헛수술 2-4개를 가지고, 열매는 자실 당 2개의 종자를 가지며, 종자는 작은 구멍이 있는 망상형 표면을 가진다. M. nudiflora는 닭의장풀과(Commelinaceae)에 속하는 분류군 중에서도 병해충을 유발하여 작물의 생산성을 감소시키는 잡초로 악명이 높으며, 주로 목화, 벼, 참깨 등과 같이 주요 작물이 재배되는 경작지에서 발견되는 것으로 알려져 있다. 본 종의 발견지들은 모두 해당 작물을 재배했던 것으로 추정되는 경작지로 M. nudiflora는 수입된 재배종 종자와 섞여 비의도적으로 도입된 것으로 보인다. 본 연구에서는 M. nudiflora의 화상자료 및 형태적 기재와 함께 국내 근연 분류군과 구별할 수 있는 검색표를 제시하고자 한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.10
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• pp.48-53
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• 2017

One of the policies of the Ministry of Agriculture, Forestry and Livestock Food and Livestock aims to export $10 billion worth of products. Although it was not easy to achieve the export goal of $ 6.5 billion in 2016, the policy should be pursued continuously. Accordingly, a facility modernization project and high-tech greenhouse project are being implemented to facilitate exports. Moreover, it is possible to consider substitution of imports in the policy shift. Imports of temperate and tropical fresh fruits totaled 1.2 trillion won in 2016. Accordingly, identification of alternatives to tropical and temperate fresh fruit imports will enable farm income to increase and the fresh fruit industry to grow. The major obstacle to tropical fruit production in Korea is high heating costs. However, Jeju Island apple mango farmers found that using non-taxable kerosene and hot water from power plants could reduce heating costs by 42.5%. Indeed, using hot wastewater can reduce heating costs by more than 40%. To improve competition with imported fruits, farmers can change their heating systems using financial support plans (e.g., 20% government subsidies, 20% loans, 30% subsidies from local governments). The income effect and import substitution effect of fruit tree farmers should be carefully analyzed in the future and the study will be closed to discuss the policy direction.

• Korean journal of applied entomology
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• v.52 no.1
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• pp.45-51
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• 2013

Tropical plants of mango(Mangefera indica), dragon fruit(Hylocereus undatus), and atemoya(Annona cherimola ${\times}$ A. squamosa) are cultivated in Jeju, Korea. A pest survey on those tropical fruits was conducted from 2008 to 2011. Major pests of Mango were thrips, aphid, mealybug, and lepidoptera species. Thrips palmi and Scirtothrips dorsalis were the most important pests in mango fields. T. palmi mainly injured the leaf but S. dorsalis injured the leaf and fruit. Lepidoptera mango pests injured leaves but some larva of Adoxophyes honmai injured fruit surface around the stem. Aphid pests, Aphis gossypii and Myzus persicae, injured the shoots and Pseudococcus kraunhiae occurred on the stem and fruit. Ant species, A. gossypii, and S. litura, were important pests on dragon fruit. Ants and aphid occurred and injured the stem, flower, and fruit. Spodoptera litura larva severely injured the stem. Among the atemoya pests, S. litura and Homona magnanima caused severe damage.

• Journal of The Korean Society of Grassland and Forage Science
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• v.13 no.4
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• pp.300-304
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• 1993

This experiment was carried out to increase the utility and productivity of forage crop as to investigate the rotation system which is suitable to cultivat at the alpine area. The treatments were 9 crops combinations including corn - rye treatment. The results obtained were as follows: 1. Rye can be cultivated satisfactorily at cold and high altitude areas such as Tae Kwan Ryong. 2. Corn, to be raised as a second crop after rye in the same year, does not have to be early (short) or medium maturity varieties in the high alpine area. 3. It is possible to increase the harvest by 30% in terms of dry melter or green crop yield through raising two crops, rye and corn, in the same year. 4. Maturity period or growth conditions of corn. as a tropical crop and the best forage crop, can improve or worsen acording to the external circumstance, such as low temperature resulting from high atitude.