• KOREAN JOURNAL OF CROP SCIENCE
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• v.26 no.3
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• pp.273-277
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• 1981

This study was carried out in 1979 to establish the proper mulching culture method for an aromatic tobacco, ST 375-4. Three different methods of mulching were employed: Improved mulching (I. M.), General mulching (G. M.) and Non-mulching (N. M.). The number of seedlings per hole was 5 for I. M., and one for G. M. and N. M. In comparison with N. M., I. M. had shortened final date of leaf harvest by 14 days, enabling curing leaves before the rainy season. It also reduced transplanting labour hours by 44.9%. Yield and price value increased with improved mulching culture. There was little difference in relative light intensity at leaves between N. M. and I. M.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.32 no.2
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• pp.196-200
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• 1987

유채박의 사료화를 위한 성분개량을 목표한 육종의 기초자료를 얻고자 유채박의 OZT함량이 낮은 영산유채와 그 함량이 고함유인 품종들을 정역교배하여 얻은 F$_2$세대의 종실을 대상으로 OZT함량에 관여하는 유전자수와 세포질의 영향에 관하여 조사분석한 결과는 다음과 같다. 1. F$_2$세대에서 OZT함양을 영산유채에 기준한 낮은 개체의 출현율은 OZT함량이 저함유인 품종을 모본으로 교배한 조합에서 높게 나타났다. 2. OZT함량의 분리비는 63 : 1에 가장 적중도가 높아 3쌍의 열성유전자가 OZT생성에 관여하고 있는 것으로 추정되었다. 3. OZT함량의 유전에 세포질의 영향이 인정되었다.

• Life and Agrochemicals
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• s.258
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• pp.52-53
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• 2010

1960년대는 개발도상국의 인구폭발로 곡물부족에 의한 인류의 위기가 눈앞으로 다가왔었다. 그런데 이 때에 등장한 선택성농약과 좋은 타이밍의 품종개량을 조합시켜 인류는 위기를 넘겼다.

• 농업기술회보
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• v.51 no.4
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• pp.32-32
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• 2014

최근 들어 토마토를 교육용 소재로 이용하거나 가정에서 재배하고 싶어 하는 사람들이 많아지고 있다. 그러나 기존에 개발된 품종들은 대부분 줄기가 무한정으로 자라면서 열매가 달리는 무한형 품종으로 가정이나 학교 교실에서 재해하기에는 관리상 어려움이 많다. 국립원예특작과학원에서는 좀 더 작고 쉽게 누구나 재배할 수 있도록 초형을 유한형의 왜성으로 개량하고 관상용 가치도 있으면서 식용으로 이용할 수 있는 토마토를 개발하였다.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.28 no.2
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• pp.233-239
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• 1983

In order to obtain basic date for the cultivation and the breeding of double zero varieties of rapeseed, spring nature grade were investigated. Spring nature grade could be classified to 8 classes by the method of material maturity. The double zero varieties, Ⅶ group of spring adaptability has been developed from the cross "Oro" and "Midas" classified as summer type. A significant negative correlation was found between the spring adaptability and seed yield. On the other hand, a highly significant negative correlation was found between maturation and spring adaptability, cold resistnce and spring adaptability, plant from and spring adaptability. Ⅵ and Ⅶ group close to summer type showed spring growing adaptability, and 0, I and II group were appeared as winter type, autumn growing adaptability with cold tolerance.with cold tolerance.

• KOREAN POULTRY JOURNAL
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• v.36 no.11 s.421
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• pp.90-93
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• 2004

• KOREAN JOURNAL OF CROP SCIENCE
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• v.30 no.3
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• pp.326-333
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• 1985

The genetic information was required to improve several plant characteristics of the two modified opaque-2 synthetics, which were synthesized in 1980 at the Chungnam National University. Genetic analysis to obtain the information was carried out by the method of Hallauer and Wright. The information obtained from the analysis indicates that plant characteristics such as plant height, ear height, kernel weight and yield of the two synthetics can be improved by proper breeding procedures, since these characteristics were showing high estimates of genetic and additive variance. The study also shows that some characteristics such as ear length or kernel row number may be not improved effectively and with ease.

• Journal of Ginseng Research
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• v.1 no.1
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• pp.13-18
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• 1976

Production of Panax ginseng in Korea has been increased tremendously in the last two decades, the acreage and number of growers hating been spread across the country. Improvement of variety, on the other hand, has been seldom carried out during this period, rendering the ginseng growing risky and hazardous. Breeding work with such perennial crop as ginseng if rather time-consuming, and there are few genesources to start with. Authorities concerned with ginseng Production pay hwy little attention to breeding researches for nimbus of reasons. As this crop is cultivated over the entire area of Korea. Breeding work cannot be allowed to delay forth. In the precut article, improvement of ginseng was discussed from the view point of two different categories of brooding concept: (1) conventional breeding and (2) breeding based on the somatic tell genetics.

• Journal of Sericultural and Entomological Science
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• v.32 no.2
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• pp.113-117
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• 1990

The recovery of mulberry from a late frost (April 24 to 27) was investigated for four varieties : Kaeryangppong, Cheongilppong, and Jamsang 21 in Cheongju area, Chungbuk Province. 1. Unfavourable meteorlogical conditions for recovery of mulberry followed the early late frost : lower than normal temperatures in mid-April, less sunshine in early and mid-Jay, lower temperatures and early and less precipitation in late-May, and less precipitation than normal in early June. 2. Jamsang 21 grew to the 2-3 leaf stage first, at which time Kaeryangppong and Jamsang 22 were at the 1-2 leaf stage, and Cheongilppong was at the swallow-bill shape-1 leaf stage. 3. The first leaf stage occurred on May 12, 15 days after the frost and, 19 days later in an average year. The difference lasted until the harvesting season, the 6 leaf stage. 4. Young shoot length was 50-58% of that in 1989. Kaeryangppong was the shortest at 50% and the Jamsang 21 highest at 58% of 1989 values. 5. Leaf number was 52-67% that in 1989. Kaeryangppong was the lowest at 52% and the Jamsang 21 highest at 67% of 1989 values. 6. Young shoot and leaf weight was 44-63%, and leaf weight 39-61%, compared to 1989. Kaeryangppong and Cheongilppong were the lowest, Jamsang 21 and Jamsang 22 were the highest, compared to 1989 data. 7. Young shoot length was 50-58% compared with 1989. Kaeryangppong was the lowest as 50%, the highest Jamsang 21 as 58%. 8. Number of leaf was 52-67% compared with 1989. Kearyangppong was the lowest as 52%, the highest Jamsang 21 as 67%. 9. Young shoot and leaf wight was 44-63%, and leaf weight was 39-61% compared with 1989. Kaeryangppong was the lowest, lowest, Jamsang 21 was the highest, Cheongilppong was similar with Kaeryangppong and Jamsang 22 was similar with Jamsang 21. 10. Rate of young shoot and leaf weight to total weight decreased from 75% in 1989 to 55-61% in 1990. Rate of laef weight to young shoot decreased from 72-82% to 67-71%, showed 5-10% decrease. 11. Leaf yield decreased highly in Jamsang 22 as 57% compared with 1989. Kearyangppong 61%, Jamsang 21 64%, Cheonglppong 72%. Leaf yield was 827kg/10g in Kaeryangppong, 1, 000-1, 050kg/10a in the other varieties.

• Proceedings of the Korean Society of Crop Science Conference
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• 1988.07a
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• pp.58-59
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• 1988