• Korean Journal of Weed Science
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• v.18 no.1
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• pp.42-47
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• 1998

The experiment was conducted to study the growth, developmental pattern, and seed production of Commelina benghalensis L. grown from four seed types; large and small aerial seeds, and large and small underground seeds. Plants from the four seed types differed in growth rate. Based on dry weight and leaf area, plants from large underground seeds emerged and grew faster in the first 2-4 weeks after seeding(WAS) but plants from small aerial seeds grew faster during the 4-6 WAS; thereafter, there was no significant difference in growth rate among plants from the four seed types. Based on seed production, plants from large aerial seed produced more seeds(1473) than those from small seeds(1006). Small aerial types represented 75-77% of the total seed production, large aerial seed 21-23%; only 2-4% were underground seeds. The results suggest that the plants from large underground seeds might have better competitive ability Than those of small aerial seeds during the early growth stage due to faster germination and higher dry matter production.

• Proceedings of the Korean Society of Grassland Science Conference
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• 2001.06a
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• pp.91.2-92
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• 2001

• Journal of The Korean Society of Grassland and Forage Science
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• v.35 no.2
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• pp.119-124
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• 2015

In this study, we sought to evaluate the growth characteristics and seed productivities of domestic tall fescue that were cultivated with differing combinations of drill widths and nitrogen-application rates in early spring; the examination was conducted at the National Institute of Animal Science, RDA, from 2013 to 2014. The main plots were three widths of 15 cm, 30 cm, and 45 cm, and the subplots were subject to nitrogen-application rates in early spring of 45 kg/ha, 90 kg/ha, 135 kg/ha, and 180 kg/ha. The growth and development characteristics did not vary by treatment in terms of drill width and early-spring nitrogen application. Tall fescue Purumi showed a stable seed productivity of two tons or greater when the drill width was set at 15 cm and 90 kg/ha of nitrogen was applied in early spring. The narrower the drill width, the greater the numbers of both the ears and seeds, while the length of the ear was longer when the drill width was wider. Regarding the influence of the drill width and early-spring nitrogen application on the productivity of seed-producing straw, the dry matter productivity was higher when the drill width was narrower; however, no particular trend was observed with respect to different amounts of fertilizer. The average production amount of the first round of straw after seed gathering was 6,920 kg/ha. The second round produced an average 8,134 kg/ha of dry matter.

• Proceedings of The Korean Society of Agricultural and Forest Meteorology Conference
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• 2001.06a
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• pp.131-134
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• 2001

잣나무는 목재생산뿐만 아니라 종자생산이라는 이중적 가치와 효용성을 지닌 주요 경제수종의 하나이다. 하지만 그 동안 대면적에 조성된 잣나무 임분은 인건비의 상승과 저가의 외국산 잣의 수입으로 인해 잣 생산을 통한 수익을 기대하기가 어려운 실정이 되었다. 따라서 잣나무림의 수익 증대를 위해서는 고품질의 종자와 양질의 목재를 증산시킬 수 있는 부가가치가 높은 임분으로의 유도가 필요하다.(중략)

• KOREAN JOURNAL OF CROP SCIENCE
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• v.31 no.1
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• pp.19-23
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• 1986

To get the basic information about ginseng seed production, yield of seed and seed quality in 27 fields were investigated. Yield of seed ranged from 4 to 10 litres per 100 kan (180cm x 90cm). Ratio of under 4mm seed is 12%, 66% for 4 to 5mm and 22% for over 5mm. Seed weight and ratio of over 4mm seed showed the decreasing tendency with the increase of seed yield per unit area. The seed yield harvested from the selected mother plants was lower than that from all plants, but seed weight and ratio of over 4mm seed were high in fields using the selected mother plants. It showed a positive correlation between length and width of seed, but no correlation between thickness and length or width. Optimum yield for high quality seed appeared under the 7 to 8 litres per 100 kan.

• The Korean Journal of Ecology
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• v.26 no.4
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• pp.189-197
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• 2003

Properties of seed production in Corydalis, spring ephemeral, group were studied during two years at Namhansansung area. Corydalis´ flower was out in the early April and its seed dispersed in the early May. The period of total seed production was 30 days. The decrease rate of sex organs was the highest between deflowering time and early fruiting time. The numbers of flower and seed per plant were in the range of 1∼13 and 0∼76, respectively. And the number of seed per fruit was from zero to twenty. In a plant, seed production was the most (11.8 seeds) in the lowest fruit and conspicuously decreased along the upward fruit. In the same plant, seed production was various by each year. The plants of small tuber size produced more seeds and those of large tuber size produced fewer seeds in the next year than this year. In the early growth season, the flowering plants/total plants rate increased in proportion to plant size (tuber volume), the rate of the smallest size class (<100 ㎣) was in the range of 5.0%(1999)∼5.4%(2000), those over the 600 ㎣ size classes were 100%. The number of flower per plant at the same size class were higher in 2000 than in 1999. Especially, at the size class of 900 ㎣≤, the numbers of flower per plant were 13.2 in 2000 and 6.5 in 1999. In the late growth season, the flowering plants/total plants rates were 13.3%in the smallest size class (<100 ㎣)and 100% over the 500 ㎣ size classes. Therefore, the flowering plants/total plants rates along the size classes were higher in the late growth season than in the early one. The bumer of fruit or seed per plant increased in proportion to the volume and dry weight of tuber, there was not significant and varied along each plant in the same size class. The number of fruit or seed per plant conspicuously increased in proportion to the leaf area. Therefore, it was thought that seed production was related to photosynthetic ability during growth season.

• Journal of The Korean Society of Grassland and Forage Science
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• v.40 no.2
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• pp.73-79
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• 2020

This study was conducted to develop a technique for the stable production of Italian ryegrass(IRG) seeds in reclamation sites. Harvesting 35 days after heading in Autumn resulted in the highest production, an average of 2,232kg/ha. The production yield decreased due to seed loss as harvesting was delayed to 45 and 55 days post-heading. For the harvested 35 days post-heading, under growing rice sowing resulted in 80% seed yield of after rice sowing's; spring sowing resulted in 40%. After rice sowing using the domestic IRG seeds of 30kg/ha produced the highest seed yield of 2,507kg/ha. The highest straw yield has resulted when using the imported IRG seeds of 20kg/ha for after rice sowing 35 days post-heading fresh weight 36,667kg/ha, dry weight 14,500kg/ha, and TDN weight 7,895kg/ha.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.41 no.3
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• pp.257-265
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• 1996

To obtain the basic informations necessary to develop the production technology of vegetable soybean seeds, this study was conducted at the National Crop Experiment Station, RDA, Suwon, Korea in 1993. Seeds of three vegetable soybean varieties, 'Mikawashima', 'Hwaeomputkong', and 'Seokryangputkong' produced at Pyeongchang, a highland in Korea and introduced from Japan were planted on April 20 in the field. The emergence rate among varieties was significanlty different. Emergence rate of seeds produced at Pyeongchang was higher by 7% than that of the seeds from Japan. Rate of pod infection by Phamapsis spp., brown spot by Septaria glycines, soybean mosaic virus(SMV), and downy mildew by Peronospora manshurica in the field was not different between locations. The growth characteristics, yield components, and green pod and grain yields were not different between locations. Therefore, it was proved that the production of vegetable soybean seeds with the better quality and higher emergence is possible in highland, Korea. possible in highland, Korea.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2017.04a
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• pp.43-43
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• 2017

종자산업은 농작물 생산에 중요한 역할을 끼치는 좌우하는 요소 중에 하나로, 우량종자의 확보는 농작물 수급에 중요한 역할을 하는 농업부문의 원천산업이다. 오이 녹반 모자이크 바이러스(CGMMV)는 박과류에 가장 많은 피해를 끼치는 바이러스로 종자전염을 방지하고, 우량종자의 공급을 위해서는 감염종자와 비 감염종자의 판별은 필수적이다. 이에 본 연구에서는 초분광 영상 시스템을 이용하여 수박종자의 CGMMV의 감염 및 비 감염종자를 판별할 수 있는 기술을 개발하고자 하였다. 본 연구에서 사용된 바이러스 감염 종자는 CGMMV 바이러스 감염 수박종자를 사용하였으며, 생산된 종자를 초분광 영상 시스템을 통해 스크린 후, RNA를 추출하여 PCR분석법으로 바이러스의 감염유무를 확인하였으며, 이후 바이러스의 감염유무와 획득된 스펙트럼을 비교 분석하여 판별모델을 개발하고 이를 선별 시스템에 적용하였다. 모델개발에 사용된 초분광 영상 기술은 초분광 SWIR(Shortwave infraed : 1000-2500nm)영상 기술이 다. 획득된 초분광 SWIR 영상을 분석한 결과 바이러스 감염 종자가 유의미한 정확도로 판별이 되는 것으로 나타났다. 초분광 SWIR 영상기술이 바이러스 감염종자와 비감염종자를 비파괴적으로 선별하는데 효과적으로 적용이 가능할 것으로 판단된다.

• Journal of Korean Society of Forest Science
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• v.84 no.2
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• pp.207-217
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• 1995

Various factors reducing seed yield in 4 Larix species throughout the whole reproductive cycle were investigated and partitionate losses attributed to them were determined. Pollen quality, lack of pollination, and degeneration of female gametophyte played minor roles in reducing seed yield. Failure of pollinated ovules to be fertilized was an important factor causing seed loss. Embryo degeneration was also a major factor causing seed loss in all 4 species. Strobili abortion, which causes loss of all potential seeds in a cone, was the most important factor in reducing seed loss in this study. Based on the results obtained from this studs, hybridizations in either direction between European larch and Japanese larch are likely to resulting viable seed. However, hybridization between tamarack as a mother tree and European larch are not likely to result in viable seeds being produced.