• The Korea Beekeeping Bulletin
• /
• s.296
• /
• pp.19-20
• /
• 2005

• The Korean Publising Journal, Monthly
• /
• s.45
• /
• pp.10-10
• /
• 1989

• Korean Journal of Agricultural and Forest Meteorology
• /
• v.15 no.1
• /
• pp.40-49
• /
• 2013

Current service system of the Korea Meteorological Administration (KMA) for blooming date forecasting in spring depends on regression equations derived from long term observations in both temperature and phenology at a given station. This regression based system does not allow a timely correction or update of forecasts that are highly sensitive to fluctuating weather conditions. Furthermore, the system cannot afford plant responses to climate extremes which were not observed before. Most of all, this method may not be applicable to locations other than that which the regression equations were derived from. This note suggests a way to replace the location restricted regression equations with a thermal time based phenology model to complement the KMA blooming forecast system. Necessary parameters such as reference temperature, chilling requirement and heating requirement were derived from phenology data for forsythia, azaleas and Japanese cherry at 29 KMA stations for the 1951-1980 period to optimize spring phenology prediction model for each species. Best fit models for each species were used to predict blooming dates and the results were compared with the observed dates to produce a correction grid across the whole nation. The models were driven by the KMA's daily temperature data at a 5km grid spacing and subsequently adjusted by the correction grid to produce the blooming date maps. Validation with the 1971-2012 period data showed the RMSE of 2-3 days for Japanese cherry, showing a feasibility of operational service; whereas higher RMSE values were observed with forsythia and azaleas.

• Korean Journal of Plant Resources
• /
• v.19 no.2
• /
• pp.340-343
• /
• 2006

This study was conducted to find out the effect of rainfall time on growth and seed quality in safflower. Rainfall was done artificially and the treatment of rainfall time was divided into 6 parts. Each rainfall treatment was done from the first day of flowering up to the fifth day after flowering, from sixth day after flowering to the tenth day after flowering, from the eleventh day after flowering to the fifteenth day after flowering, from sixteenth day after flowering to twentith day after flowering, from the twenty first day after flowering to the twenty fifth day after flowering and from twenty sixth day after flowering to thirtith day after flowering. Rainfall time after flowering did not affect disease occurrence on the upper part and flower bud of safflower, which were infected at were 3.3 and 1, respectively. Ripened grain found on the main stem and primary branch was 37.4% and 65.0% at first day to the fifth day and sixth day to the tenth day rainfall periods after flowering, respectively. Yield was decreased by 14% in the sixth day up to the tenth day and eleventh day up to the fifteenth day rainfall periods (282-281kg/10a) compared to the one under control (327kg/10a). Hunter's L value was 73.5 and 69.9 in twenty first up to the twenty fifth day and twenty sixth up to the thirtith day rainfall periods after flowering, which decreased significantly to 79.3 under non-rainfall period. Therefore, it can be concluded that the optimum harvest time is twenty fifth day after flowering to maintain seed quality at rainfall time and before harvesting period.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.32 no.2
• /
• pp.188-195
• /
• 1987

This study was conducted to investigate whether seedling growth be affected by immature kernels from different stages after flowering in rye, triticale, wheat and oats cultivars, for two years in Suwon. Kernels reached a near-maximum test weight at 35 days after flowering in Paldanghomil and Dooroohomil (Rye), and 30 days in Sinkihomil (Triticale), Geurumil (Wheat), and Megwiri (Oats). Test weight of immature kernels from different days after flowering were not significantly correlated with germination percentage, but highly positively correlated with their seedling height, fresh and dry weight. However, seedling height is not different among seedlings from kernels harvested at 20, 25 and 30 days (maturing time) after flowering of Sinkihomil and Megwiri, and between 25 and 30 days (maturing time) of Geurumil. Also between seedlings from 25 day and 30 day-kernel after flowering are little difference of fresh and dry weight of Sinkihomil and Megwiri. In Suwon, located at the middle part of Korea, it was suggested that Paldanghomi1 and Dooroohomil could be harvested at 35 days (June 19, and June 24, respectively) after flowering, and Sinkihomil, Geurumil, and Megwiri, at 25days (June 24, June 14 and July 4, respectively) after flowering for seed of for2:ge production.

• Korean Journal of Medicinal Crop Science
• /
• v.5 no.4
• /
• pp.284-288
• /
• 1997

In order to study on suitable harvest time of adlay utilizing self-feeding combine harvester with four rows, which is originally designed for rice harvest, harvesting were carried out at four different times (40, 50, 60 and 70 days after anthesis) . For efficient operation, appropriate working rows were 2 rows at 50 days after anthesis and working speed was 0.26m/sec at 60 days after anthesis. Theoretical working capability was 11.23a/hr at 60 days after anthesis. As the harvesting was delayed, water content of adlay decreased. Water content of culm+leaf was $69.7{\sim}55.3%$ and water content of grain was 34.2% at 60 days after anthesis. The later adlay was harvested. the higher the percent of ripened grain was. But the immature grain was decreased. Remnants was less than 1.8% at 60 days after anthesis. The later adlay was harvested, the heavier volume weight was. Yield was the highest at 60 days after anthesis. When utilizing self-feeding combine harvester with four rows, which was originally designed for rice harvest, suitable harvesting time was 60 days after anthesis. Therefore, theoretically suitable harvest time was 68 days after anthesis.

• Korean Journal of Plant Resources
• /
• v.28 no.1
• /
• pp.111-118
• /
• 2015

The objective of this study was to determine the response of rapeseed (Brassica napus) to different planting date in the spring and varieties on growth and flowering characteristics. Eight rapeseed varieties were sowed at 10 day interval from 1st to 31th of March at Muan and Jeju in Korea. Significant planting dates and rapeseed varieties effects for growth, start of flowering and duration. As the planting date was being delayed, plant length and flower number were decreased, but branch number was increased. And, start of flowering date was retarded and flowering duration decreased with later planting date. Days from planting to flowering was shortened as seeding date was delayed and shortening degree was similar between experimental locations, Muan and Jeju. The days to flowering for rapeseed about 73~94 days for 1st March and then decreased to 57~71 days for the 31th March of planting date. 'Tammiyuchae' and 'Mokpo 111' seeded on each planting date come into blossom more earlier about 10 days as compared to 'Tamlayuchae' and 'Naehanyuchae'. The duration of flowering for the B. napus varieties was shortened as planting date was delayed. The results revealed that flowering characteristics of rapeseed can be greatly enhanced by planting as early as possible, and early flowering varieties i.e. 'Tammiyuchae' and 'Spring' were the most suitable varieties among the tested varieties for planting in the spring.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.38 no.1
• /
• pp.23-30
• /
• 1993

This study was conducted to obtain the fundamental information on antioxidant component as affected by process of grain filling in different plant types of sesame. Sesamin and sesamolin as antioxidant components, oil content and seed weight were investigated for two plant types with different by branching habit. The sesamin and sesamolin contents in grains followed a pattern of increase immediately after flowering in branch type and monocapsule habit than non-branch type and tricapsule habit. But they started to decrease around 45 days after flowering, which oil content and seed weight continued to increase until maturity. The sesamin content increased quickly up from 10th to 40th day after flowering and showed almost maximum at 43th day after flowering. The sesamolin content increased quickly up from 20th to 30th day after flowering and showed almost maximum at 45th day after flowering. The oil content increased quickly up from 20th to 30th day after flowering and showed almost maximum at 47th day after flowering. The seed weight increased quickly up from 20th to 40th day after flowering and showed almost maximum at 48th day. The sesamin content, sesamolin content, oil content and seed weight showed almost maximum at from 43th to 48th day after flowering. So that this period was considered to be of physiological maturity.

• Proceedings of the Plant Resources Society of Korea Conference
• /
• 2020.08a
• /
• pp.52-52
• /
• 2020

유채(Brassica napus L.)는 식용유 생산을 목적으로 재배되며, 1975년에는 26.8천ha가 재배되어 연간 생산량이 34.7천톤이 생산되었으나, 외국으로부터 값싼 식용유의 대량수입으로 재배면적이 급격하게 감소되었다. 그러나 최근에 지방자치단체를 중심으로 경관용 재배면적이 증가하고 있고, 건강에 대한 관심이 높아짐에 따라 국내산 non-GM 식용유 생산을 목적으로 유채 재배면적이 급격하게 증가하고 있다. 유채의 대량생산을 위해서는 논 재배가 필수적이나 유채와 벼의 이모작 재배 시기가 겹치는 문제점이 발생하고 있어 조생종 유채의 품종개발과 함께 봄 파종이 가능한 유채의 품종 육성에 대한 요구가 매우 높다. 따라서 본 연구에서는 국내 보유 유채를 포함하는 십자화과(Cruciferae) 유전자원의 특성 평가를 통해 극조숙 유채 품종 육성을 조기에 육성하기 위해 실시하였다. 농촌진흥청 국립유전자원센터에서 분양받은 유전자원 146계통을 파종 재배하면서 핵형분석과 외부형질을 기준으로 정확한 종을 동정하였고, 각 유전자원의 생육 및 개화특성을 조사하였다. 유전자원들을 세포분석기를 이용하여 핵형을 분석한 결과, 전체 146개의 유전자원 중 유채(B. napus L.) 128계통, 갓(B. juncea Sinsk) 6계통, 배추(B. campestris Makino) 9계통, 미분류 3계통 등으로 조사되었다. 유전자원을 가을 파종(10월 22일)하였을 때 개화가 가장 빠른 계통(IT 279089)이 파종 후 137일 이후인 3월7일부터 개화가 시작되었고, 가장 늦은 계통(IT 279198)은 191일 후인 4월 30일에 개화가 시작되었다. 봄 파종(2월 4일)하였을 때 개화가 가장 빠른 계통(IT 279089)이 파종 후 79일 이후인 4월 23일부터 개화가 시작되었고 IT 279092 등 29계통은 추대와 개화가 되지 않았다. 위와 같은 연구결과를 토대로 개화시기가 빠른 유전자원을 육종을 위한 인공교배 시화분친이나 종자친으로 이용하면 지방산 품질이 좋고 극조숙성인 유채 품종의 개발이 가능할 것으로 생각된다.

• Korean Journal of Agricultural Science
• /
• v.4 no.1
• /
• pp.51-60
• /
• 1977

In order to determine ecological variations of flowering date and yields under the different seasonal cultures, and to select the higher yielding varieties which were adaptable to Korean climate, 100 mungbean cultivars were sown at the interval of 15 days from April 22 to July 21 in 1976. The results obtained are summarized as follows: 1. The number of days required to flowering from seeding were decreased by delaying the seeding date. 2. When accumulated temperature at first flowering from seeding were reached $945-1,126^{\circ}C$, the mungbean cultivars started to flower regardless of seeding dates. Especially, when mungbean was planted around standard planting date, the plants flowered for very short duration. 3. There were highly significant correlations between the number of days from seeding to flowering at each seeding date and standard planting date. 4. Yields per plant were tend to decrease with the delay of seeding date but there were no significant difference between seeding dates. Therefore, it appears that mungbean can be planted for longer period of time compared to other crops such as rice and soybean. 5. Highly significant correlations were found between the number of days of first flowering and yields per plant at most seeding dates. 6. It may be feasible to grow high yielding mungbean cultivars such as CES 140, LM 2100, LM 690, L 576 and LM 689 after harvesting of spring vegetables in May and before planting of fall vegetables.