• 한국작물학회:학술대회논문집
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• 한국작물학회 2022년도 추계학술대회
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• pp.133-133
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• 2022

Temperature is a crucial environmental factor for rice cultivation due to the climate change and can influence the rice growth and development. Therefore, the effect of temperature on plant growth characters was examined during the vegetative stage. Plants were grown under three different temperatures: 23℃/13℃ for 18℃, 26℃/16℃ for 21℃ and 29℃/19℃ for 24℃ in the phytotron. The temperature was treated after transplanting and ended in early panicle initiation stage. Heading date of the two varieties were strongly affected by the temperature and were delayed in the 18℃. The plant height in the 18℃ was 21 % shorter than the 21℃ and 24℃ and the tiller and leaf number were increased in the 18℃. All the growth rates of the characters were the slowest in 18℃. The stem dry weight was significantly increased in 18℃. Nitrogen content was increased in the leaves of 18℃ whereas available phosphate and potassium content was found to be increased in the stems of 21℃ and 24℃. OsNRT 2.1 was overexpressed in the leaves and stems of 18℃ and OsNRT2.3a could be expressed in 18℃ and 21℃ temperatures whereas more expressed in 21℃. OsPT1 and OsPT6 could be expressed in the leaf of 18℃ and 24℃ but could be expressed in the stem of 18℃. OsHAK1 and OsHAK5 could be overexpressed in the leaves and stems of 18℃. For hormone, OsCKX2 gene was found to be up regulated in the leaves of 18℃ and OsIAA1 gene could be expressed more in the stem of 24℃.

• 한국육종학회지
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• 제51권2호
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• pp.105-109
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• 2019

'황다옥'은 다수성 종실용 옥수수 품종 개발을 위하여 2009년에 농촌진흥청 국립식량과학원에서 자식계통 KS203과 KS190을 교잡하여 육성한 다수성 1대 교잡 품종(F1품종)이다. '황다옥'의 종피색은 황색이며 입질은 마치종이다. 2012년 생산력검정시험을 거쳐 2014~2016년까지 3년 동안 수원 등 3지역에서 지역적응시험을 실시하였다. 그 결과 우수성이 인정되어 2016년 농작물 직무육성 신품종으로 결정되었고 '황다옥'으로 명명하였다. '황다옥'의 출사일수는 76일, 간장은 262 cm, 착수고율은 51%로 '장다옥'과 비슷하다. 도복은 '장다옥' 정도로 강한 것으로 나타났다. 100주당 이삭수가 많으며, 이삭길이는 21.3 cm, 100립중은 34.7 g으로 '장다옥'과 비슷하다. 깨씨무늬병은 중강정도의 저항성이며, 그을음무늬병에는 강한 저항성이었다. 조명나방 저항성은 중 정도를 보인다. '황다옥'의 종실수량은 ha당 10톤으로 '장다옥'보다 6% 더 많았다. 2:1 (모본:부본) 재식비율로 동시 파종하여 채종시험한 결과 모본 출사기와 부본 화분비산기간이 일치하였으며 채종수량은 ha당 1.68톤이었다. '황다옥'은 전국적으로 재배가 가능하다.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.354-354
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• 2017

Rice grain yield is determined by crop dry matter production that is sensitive to temperature. Our objective was to determine whether the difference in temperature between years had an impact on the relationship between yield components and grain yield. Field experiments were conducted under machine transplanting cultivation by using yield data of two japonica rice varieties, Odaebyeo (early maturing) and Nampyeong (mid-late maturing), in 2013 to 2016 in Suwon, Korea. Plant height, dry weight, and yield components were examined by analysis of variance, correlation. The milled rice yield of the two varieties were the highest in 2016, however the lowest yields were observed in the different years. In 2016, Odaebyeo produced $0.96t\;ha^{-1}$ greater milled rice yield than in 2015, and Nampyeong produced $1.11t\;ha^{-1}$ greater yield than in 2013. The correlation analysis indicated that spikelet per panicle (R = 0.53) was associated with grain yield of Odaebyeo. In Nampyeong, biomass at heading date (R = 0.74), 1000-grain weight (R = 0.71), spikelet per panicle (R = 0.58), and panicle number per $m^2$ were associated with grain yield. Sink size (spikelet number per $m^2$) of the two varieties responded to accumulative temperature from transplanting to panicle initiation stage. In this experiment, optimal accumulative temperature before panicle initiation has effect on increased spikelet number and/or number of panicle that were mainly responsible for yield difference. Rice production research to increase grain yield should consider all yield components, but increased emphasis on biomass production before heading is also necessary as well as grain ripening conditions.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.119-119
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• 2017

Growth related to morphological and proteome response under waterlogging stress in sorghum has not yet been elucidated. Understanding how plants respond to waterlogging, the present study was conducted in seedlings leaf of the Nam-pung chal cultivar. Regarding 3-leaf stage of sorghum, stem length and plant height were slightly decreased in the treatments during ten days of waterlogging, and chlorophyll contents were also significantly different from 7 days of waterlogging treatment. The results observed from the present study were considered to be influenced by the waterlogging stress more in the $5^{th}$ leaf stage of the growth period of the sorghum, and as the waterlogging treatment progressed, the waterlogging stress gradually influenced the growth difference between the control and the treatment respectively. Using 2-DE method, a total of 74 differentially expressed protein spots were analyzed using LTQ-FT-ICR MS. Of these proteins, 45 proteins were up-regulated in the treatment group, and 32 proteins were down-regulated. Analysis of LTQ-FI-ICR MS showed that about 50% of the proteins involved in carbohydrate metabolic process, metabolic process, and cellular metabolic compound salvage were affected by stress. Malate dehydrogenase protein and Glyceraldehyde-3-phosphate dehydrogenase protein related to carbohydrate metabolic process increased the level of protein expression in both 3 and 5-leaf stage under waterlogging stress. The increased abundance of these proteins may play an active role in response to waterlogging stress. These results provide new insights into the morphological alteration and modulation of differentially expressed proteins in sorghum cultivar.

• 한국토양비료학회지
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• 제50권6호
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• pp.644-652
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• 2017

Clover, a legume crop, is a landscape crop and green manure crop that can be sowing in spring. Clover serves various roles such as landscape composition, weeds suppressing, prevention of soil loss and nutrients on sloping, atmosphere purification, and supplying nitrogen in soil. Thus, in order to utilize this crop in agricultural land, we observed its effect on growth and carbon uptake in upland soil. The plant height of clover species increased with late harvesting time and was 46.0~55.0 cm at 90 days after seeding (DAS) and the longest in red clover. The dry matter increased at 85 DAS, after that, decreased slightly. The dry matter of white clover and red clover was $3.0Mg\;ha^{-1}$ and $3.1Mg\;ha^{-1}$, respectively, and crimson clover was $2.5Mg\;ha^{-1}$, significantly lower than other clover. Crops bloomed at 90 DAS were white clover and crimson clover, the period from sowing to flowering was 78 days for crimson clover and 85 days for white clover. The nitrogen content of the clover species was $12.0{\sim}29.3g\;kg^{-1}$, with the highest of $29.3g\;kg^{-1}$ for white clover. The carbon content of clover species was similar in all clover species, but carbon uptake was high in white clover and red clover, and lowest in crimson clover. The carbon uptake of the plant increased to 85 DAS and then decreased. Based on the clover growth and carbon uptake, white clover and red clover were promising when sown in spring.

• 한국초지조사료학회지
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• 제8권1호
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• pp.26-32
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• 1988

This study was conducted to determine the effects of cutting frequency and cutting height on agronomic characteristics and yield performance of sorghum-sudangrass hybrid, cv. Pioneer 855 F on the experimental field of Livestock Experiment Station, Suweon. The results are summarized as follows: 1. The relative contribution of leaf component to total yield was higher when the plants were cut frequently rather than when defoliated only a few times, and tend to be higher with high cutting. 2. Leaf Area Index (LAI) was the highest at the primary growth of two cutting times scheme and the first regrowth for three or four cutting times a year, but LAI, in general, was not related to cutting height. 3. Crop Growth Rate was the heighest at the first regrowth-plants grown in summer, and it was also related to the amount of stubble left at the previous cut. 4. Dead stubbles were not occurred when plants were cut before heading, but those were accompanied by the frequent and low cutting. 5. Total fresh fodder and dry matter yield were the highest at two times cut a year, and decreased with frequent cutting. The optimum cutting height at two times cut was ca. lOCm height stubble from the ground level, but yield increased with higher level cutting at the three or four times cut a year.

• 한국초지조사료학회지
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• 제34권3호
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• pp.163-168
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• 2014

This study was conducted to investigate the effects of bacterial inoculation (Lactobacillus plantarum) and cutting height on the chemical composition, fermentation characteristics and in vitro dry matter digestibility (IVDMD) in whole crop barley silage. Barley forage (Youngyang hybrid) was harvested at about 27% of dry matter (DM) level at two different cutting height (5 vs. 15 cm). And it was chopped to 5 cm length and treated with or without L. plantarum. Four replicates of each treatment were ensiled into 10 L mini silo (3 kg) for 100 days. After 100 days, bacterial inoculation decreased (p=0.001) DM content, while increased cutting height increased (p=0.002) DM in uninoculated silage. Crude protein (CP) concentration was decreased by increasing height in uninoculated silage (8.84 vs. 8.16) but increased in inoculated silage (8.19 vs. 8.99). Both neutral detergent fiber (NDF) (p<0.011) and acid detergent fiber (ADF) (p<0.004) were decreased by increasing cutting height of forage at harvest. The IVDMD and ammonia-N was increased (p=0.001) by increasing cutting height and inoculation, respectively. Lactic acid bacteria (LAB) was increased (p=0.002) in inoculated silage, but yeast count was decreased (p=0.026) in uninoculated silages. It is concluded that increased cutting height of forage at harvest could be useful to make a fibrous portion with increase of dry matter digestibility of silages.

• 한국작물학회지
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• 제42권5호
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• pp.528-533
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• 1997

Brittle culm벼의 예취높이를 구명하여 조사요로서의 수량 및 영양가를 평가하고자 섬진벼 및 Brittle culm인 KL501 품종을 공시하고 예취높이를 지상 0, 5, 10 및 20cm 달리하여 1996년 호남농업시험장 수도포장에서 수행한 결과를 요약하면 다음과 같다. 1. 재생초장, 경직경 및 재생경율은 예취높이를 높게 할수록 크고 높았으며 분얼경수는 품종 및 예취높이간유의성이 인정되었다. 2. 조단백질, 조지방 및 NFE 함량은 1차 예취시 예취높이가 높아짐에 따라 증가하나 조섬유 및 조회분함량은 이와 반대의 경향이며 2차 예취시 예취높이가 높아짐에 따라 조단백질 및 조지방함량은 감소하고 조섬유 및 조회분함량은 증가하였으나 NFE 함량은 처리간 차이가 없었다. 3. 청예수량 예취높이 10cm가 다른 처리구보다 많았는데 섬진벼는 4.45ton /ha, KL501은 4.71ton /ha이며 건물수량은 섬진벼가 1.16 ton /ha, KL501이 1.14 ton /ha이었다. 4. TDN함량은 1차 예취시 예취높이가 높을수록 증가하나 2차 예취시는 이와 반대의 경향이며 TDN수량은 예취높이 10cm, 예취시 섬진벼는 0.63ton /ha, KL501은 0.61ton /ha로 다른 처리구보다 많았으나 품종간 차이는 인정되지 않았다.

• 한국작물학회지
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• 제65권1호
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• pp.63-71
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• 2020

본 연구는 기존 채소 정식기를 활용하여 기계화율이 낮은 종실용 들깨를 대상으로 육묘 기계정식 재배 시 적합한 상토, 트레이, 육묘일수를 설정하고자 2017년부터 2018년까지 2년간 수행하였으며, 주요 결과를 요약하면 다음과 같다. 1. 들깨의 지상부 생육은 수도용 경량인 R1 상토가 가장 좋았으며, 주요 성분비는 질석(Vermiculite) 41.0%, 코코피트(Cocopeat) 31.0%, 황토(Red-yellow soil) 20.0%, 피트모스(Peatmoss) 5.7% 등을 포함하고 있다. 2. 묘를 직접 뽑아서 공급하는 반자동 정식기를 사용할 경우 128~220공 트레이와 수도용 경량 상토에서 23일 육묘가 적정한 것으로 판단된다. 3. 128공 전용트레이를 사용하는 꽂아내기식 정식기는 매트형성과 초장을 고려하면 수도용 경량 상토에서 23일 정도 육묘가 적정한 것으로 나타났다. 4. 220공 전용트레이를 사용하는 밀어내기식 정식기는 줄기를 잡고 정식하기 때문에 초장이 15 cm 이상 되어야 가능하다. 220공에서 15 cm 이상으로 육묘하는 것이 어려워 기계정식에는 부적정한 것으로 판단된다.

• 한국초지조사료학회지
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• 제40권3호
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• pp.138-148
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• 2020

This study was carried out to find out the changes in the growth characteristics and feed value of the three different whole-crop silage rice cultivars of whole-crop silage rice such as Jonong, Yeongwoo and Mogwoo to develop an efficient double cropping system. This study showed that there were significant differences biomass and feed values among cultivars but no clear difference among transplanting dates. Dry weight and height were in order of Mogwoo, Yeongwoo, Jonong (p<0.05). Dry weight and feed value of Jonong showed no significant difference after 21 days after heading (DAH), it was expected to be harvested before DAH 30 days. Yeongwoo showed a lower dry weight than Mogwoo, but heading date was earlier than Mogwoo, so one can expect a higher feed value than Mogwoo. Mogwoo had lower crude protein and total digestible nutrient than the other two cultivars but relative feed value in stem was higher than that of the other cultivars, but had higher dry weight than other cultivars so it was considered to take an advantage as a silage rice. Therefore, the results of this study suggest that the selection of whole-crop silage rice on the cropping system be made comprehensively by considering the heading characteristics of the cultivars and the feed value.