• 한국초지조사료학회지
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• 제16권1호
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• pp.39-46
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• 1996

The experiment was conducted to inxvestigate matter production ability and growth characteristic variation for Italian ryegrass seed of introduced variety and the different seed production time of the next generation in paddy field at Iksan and Kyehwa experiment field from 1987 to 1988. Germination rate is good at seed production of 35 days before and after heading with introducced variety. Also, Early growth before wintering, dead leaf rate and regenerating day is same tendendy. Panicle numbers per hill like that and heading date is for 15~20 days after heading seed is late about three days, but 35 days before and after heading seed is early about one day. Fresh and drymatter yield at the different cutting time shows decrease in 15~25 days after heading seed but 35 days before and after heading seed is same or increase trend, it's notable at Kyehwa paddy field in reclaimed land. In case of feed value according to cutting time differ little against introduced seed.

• 한국환경복원기술학회지
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• 제19권2호
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• pp.71-81
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• 2016

This text was experimented and investigated the optimum production time and germination characteristics of seed that collect in Korean Chungnam, in order to offer the basic informations for slope restoration and revegetation using Poaceae plant. Optimum time of seed production was mid-late October of Miscanthus sinensis, Pennisetum alopecuroides, early November to late October of Themeda triandra var. japonica and M. sacchariflorus, and mid November of Phragmites communis. Epiphytic amount of seed full ripe was the most times in mid October of M. sinensis, P. alopecuroides and M. sacchariflorus, early November of T. triandra var. japonica, and mid November of P. communis. Seed rate of maturity was the highest times in early November of M. sinensis, P. alopecuroides and M. sacchariflorus, and mid November of T. triandra var. japonica and P. communis. Germination rate by seed collection time was the highest times in early October of M. sacchariflorus, mid October of T. triandra var. japonica, early November of M. sinensis and mid November of P. communis. Germination days by seed production time was the shortest times in early November of M. sinensis and M. sacchariflorus, mid November of T. triandra var. japonica and P. communis. Optimum temperature of germination was $20{\sim}25^{\circ}C$ in M. sinensis and P. alopecuroides, $25^{\circ}C$ in T. triandra var. japonica, and $25{\sim}30^{\circ}C$ in P. communis.

• 한국산림과학회지
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• 제96권3호
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• pp.317-324
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• 2007

종자 공급 방안 개선에 필요한 기초 자료 획득을 위해 소나무 우량 임분 3개소를 대상으로 2003년부터 2006년까지 구과 생산량에 따른 종자 및 발아 특성을 분석한 결과 다음과 같은 결과를 얻었다. 구과 생산량은 2년을 주기로 하여 풍 흉 상태를 보였다. 주요 종자 특성 중 종자 생산 능력과 충실 종자율은 대체적으로 구과 생산량과 유사한 경향을 보인 반면 성숙 종자율과 종자 효율은 반대 경향을 나타내었다. 종자 특성과 구과 생산량과의 회귀분석 결과에서도 종자 생산 능력 ($R^2=0.682$, p<0.01)과 충실 종자율($R^2=0.l61$, non-significant)은 정(+)의 경향을, 성숙 종자율($R^2=0.418$, p<0.05)과 종자 효율($R^2=0.308$, non-significant)은 부(-)의 경향을 나타내었다. 발아 특성에 있어서 발아율은 대체적으로 구과 생산량과 유사한 경향으로 나타났으나, 평균 발아 일수는 반대의 경향을 보였다. 회귀분석결과에서도 발아율은 구과 생산량과 정(+)의 관계($R^2=0.576$, p<0.01)를 보인 반면, 평균 발아 일수는 부(-)의 관계($R^2=0.400$, p<0.05)를 보여 구과 생산량이 많은 시기에 이를 채취하여 사용할 때 발아율도 높고 발아에 소요되는 기간도 짧아져 즉, 발아 효율이 높아짐을 알 수 있었다.

• 한국작물학회지
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• 제49권5호
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• pp.373-380
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• 2004

The production of sweet (su) and super sweet corns (sh2) has been economically feasible in Korea in recent years. Major factors limiting super sweet corn production are low germination and low seedling vigor. Since seed quality is closely related to seed maturity, the optimum harvest time for the seed production of sweet and super sweet corns was studied and the quality of seeds with varying maturities was investigated in 2001 and 2002 cropping seasons. The parents of the sweet corn seeds were Hybrid Early Sunglow and 'Golden Cross Bantam 70' and those of super sweet corn were Xtrasweet 82 and 'For­tune'. Seeds were harvested at 21, 28, 35, 42, 49, and 56 days after silking (DAS). As the seeds developed, seed weight of sweet corn increased and the seed moisture content decreased faster than that of super sweet corn. Germination rates of sweet corn seeds harvested 21 and 28 DAS at $25^{\circ}C$ and emergence rates in the cold soil test were significantly lower than those of seeds harvested after 42 DAS in both years. Although the germination rates of super sweet corn seeds with varying maturities showed similar patterns as sweet corn seeds at $25^{\circ}C$, the emergence rate of super sweet corn seeds in cold soil test continuously increased with seed maturity. This suggests that seed quality of super sweet corn should be tested in a cold soil test to estimate field emergence. As the seeds developed, leakage of total sugars and electrolytes from the both sweet and super sweet corn seeds decreased up to 42 or 49 DAS. The $\alpha-amylase$ activities of both sweet and super sweet corn seeds increased with seed maturity from 21 to 35 or 49 DAS depending on genotype and year. The optimum harvest time for the seed production of sweet corn was 42 DAS and 49 DAS for super sweet corn considering emergence rate and plumule dry weight in the cold soil test, leakage of sugars and electrolytes from the seeds, and $\alpha-amylase$ activity.

• 한국자원식물학회지
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• 제8권3호
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• pp.247-252
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• 1995

양파 채종재배(採種載培)에 적합(適合)한 파종시기(播種時期)와 피복(被覆)을 구명(究明)코자 시험(試驗)하였던바 그 결과(結果)를 요약(要約)하면 다음과 같다. 1. 생육(生育), 추태율(抽苔率), 개화율(開花率), 화경당(花莖當) 소화수(小花數) 및 임실율(稔實率)은 9월(月)10일(日)$\sim$ 25일(日) 파종(播種), 투명(透明) 비닐피복(被覆) 하(下)에서 가장 양호(良好) 하였다. 2. 주당(株當) 채종량(採種量) 및 10a당(當) 채종량(採種量) 역시(亦是) 9월(月)10일(日)$\sim$25일(日)에 투명(透明)비닐 피복하(被覆下)에서 증수(增收)여서 우리나라 남부지방(南部地方)에서는 양파모구(母球)를 9월(月)10일(日)$\sim$25일(日)에 투명(透明)비닐 피복하(被覆下)에서 파종(播種) 하는 것이 적합(適合)한 것으로 나타났다.

• 한국환경복원기술학회지
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• 제17권2호
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• pp.85-92
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• 2014

This text was analyzed and investigated the morphological character, production time and germination characteristic of seed that collect in Chungnam, in order to offer the basic informations for slope restoration and revegetation using Indigofera amblyantha of wild shrub. Legume was cylindrical type and length 31.5mm, width 2.5mm, and seed number of per legume was full ripe 5.5, unripe 0.9. Seed was elliptical type and length 2.4mm, width 1.7mm, and weight of 1,000 seeds was 5.9g. Because seed matured within December and next year January, optimum time of seed production was in mid of January. In the treatment $H_2SO_4$ of 15 minutes, seed germination rate was the highest as 91.0%, and seed germination time (days) was the shortest as 6.7 days. Seed germination time by temperature was the shortest from $25^{\circ}C$. Therefore, seed germination of Indigofera amblyantha was very useful in the treatment $H_2SO_4$ of 15 minutes from $25^{\circ}C$ temperature.

• 한국산림과학회지
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• 제97권2호
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• pp.135-139
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• 2008

Seed production and germination could be influenced by some factors. The picking time and climate factors are regarded as the elements to obtain sound seeds. We have observed the seed productivity and germination of seeds from trees of Chamaecyparis obtusa selected in a clonal seed orchard. Depending on picking time, various shapes from liquid material, something jellied to the fully matured one were observed. Germination aspects varied throughout the test days. After 20days of seeding in a glass petri-dish, germinal apparatuses appeared from the all seeds which had been picked from after at the end of August. The highest germination rate of about 30% was observed from the seeds picked from $20^{th}$ of September and $10^{th}$ of October. Seed production was about two times higher in 2005 than in 2006 and the average germination rate was also higher in 2005. We have also analyzed the effects of climatic factors about two consecutive years on seed productivity. Among the climatic factors, monthly sum of temperature and of precipitation were the main factors for maturation of Chamaecyparis obtusa seeds.

• Journal of Biosystems Engineering
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• 제28권6호
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• pp.531-536
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• 2003

This study was carried out to develop a vacuum nozzle seeder for large seeds and performance was tested on seed feeding, arranging. and sowing peformance. The results of this study were as follows： The operation of feeding device of the seeder was programmed to operate a period of setting time after sowing 6 rows. The setting time was decided based on a discharged seed by the angular speed of feeding roller. The arranging accuracy of 'tuktozwa', 'hukjong' and 'chambak' was 96.4％, 95.2％ and 89.4％ respectively. The working performance was 75.6sheet/hr which was 3.8 times higher than that of manual work. An average seeding rate of 1 grain was 97.8％.

• Biotechnology and Bioprocess Engineering:BBE
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• 제6권2호
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• pp.156-156
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• 2001

The objective of this study was to investigate the effects of nutrients and culture conditions on morphology during the seed culture of C. acremonium ATCC 20339 Morphological factors such as hyphal length number of tips number of arthrospores were observed to investigate the relationship between seed morphology and CPC production. During the time course of seed culture, hyphal length was shortened and the number of arthrospores increased rapidly On the other hand the number of tips deceased rapidly and this was closely related to the hyphal length Mixed nitrogen sources of 3% solybean meal and 1% cotton seed flour were determined as the proper organic nitrogen sources, in terms of the morphological factors in the seed culture. This fact was proven in batch culture for the production of Cephalosporin C. It was also found that a proper agitation speed enhanced the morphological differentiation of C. acremonium ATCC 20339, thus improving the production of Cephalosporin C.

• 한국작물학회지
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• 제53권1호
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• pp.70-74
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• 2008

자운영 종자 생산을 위한 적정 수확시기를 결정하고자 개화 후 25일부터 5일 간격으로 40일까지 수확한 시험의 결과를 요약하면 아래와 같다. 1. 수확 시기별 자운영 종자 수량은 수확시기가 늦어질수록 증가하는 경향을 보였으며, 개화 후 35일이 가장 많았다. 2. 자운영 종자활력은 개화 후 35일 이후 수확한 것이 90%이상 높았으며 포장에서 자운영 지속재배를 위한 적정환원 시기는 개화 후 35일 이후였다. 3. 자운영 수확 후 발아율은 수확시기에 따른 차이가 인정되지 않았지만 저장기간이 길어질수록 늦게 수확한 것이 발아율이 높았다. 4. 발아율은 $10{\sim}40$일 침종에서 증가하였으며, 40일 이상 침종시 발아율이 급격하게 떨어지는 경향을 보였다. 5, 경실율도 개화 후 수학시기가 늦을수록 증가하는 경향을 보였다. 이상의 결과로 자운영 종자 수확을 위한 적정 수확시기는 개화 후 35일이 적당할 것으로 사료된다.