• 한국작물학회지
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• 제64권3호
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• pp.213-224
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• 2019

There is an increasing frequency in the occurrence of abnormal weather phenomena such as sharp increases and decreases in temperature. Under these weather conditions, the heading time of rice changes unexpectedly, which poses problems in agriculture. Therefore, we investigated the effect of temperature on the heading response at different growth stages in rice. During the period from transplanting to heading, the plants were subjected to different temperature treatments, each for a 9-day period, to observe the heading response. For the heading date analysis, "heading date" was defined as the number of days from transplanting to the appearance of the first spikelet. We found that the influence of temperature increased in the order of rooting stage, followed by meiosis, early tillering, spikelet differentiation, and panicle initiation stage in all ecological types and cultivars. In particular, unlike the results reported previously, the effect of temperature on heading during the photo-sensitive period was very small. Meanwhile, the influence of temperature on vegetative growth response at different growth stages was not consistent with heading response. These results can be used as basic data for predicting the variation in heading date owing to temperature variation at each growth stage. In addition, we propose that the concept of day length should be included in determining the influence of temperature on the photo-sensitive period.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2022년도 추계학술대회
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• pp.167-167
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• 2022

Seed production of italian ryegrass has a problem of lodging during ripening and a decrease in quality due to difficulty in drying seeds during harvest. Therefore, in order to produce high-quality Italian ryegrass in paddy fields, it was carried out to reduce the density and solve the lodging problem through transplanting. In this experiment, Lolium multiflorum cv. Kowinearly was transplanted in autumn from a paddy field in Sindong-ri, Gwansan-eup, Jangheung-gun, Jeollanam-do. var. Kowinearly was made into a bed at 90 g/box and stacked in boxes. It was transplanted on October 27th after 2 days of germination at 30℃ and 15 days of seedling and greening. When transplanting, they were transplanted at intervals of 30×14cm. The existing cultivation method, drill seedling, was sowed at a level of 50 kg/ha, and both transplanting and drilling were carried out at a nitrogen fertilization rate of 45 kg/ha. The number of ears during transplant cultivation was 1,016/m² and the drilling tended to be higher at 2,278/m², but this was probably due to the difference in seeding amount. The seed number of an ear tended to be 56% higher in transplantation, which had a significant impact on yield. The seed yield was 2,096 ka/ha in transplantation, which was 21% higher than that of drilling. When looking at the relationship with weed occurrence, there were areas where all the weeds, such as amul foxtail, occurred due to the low density. Even in the same transplanting area, the seed yield was about 1,000kg/ha less in the area where the weeds were abundant. It seems that weed management is important in paddy cultivation. Therefore, it seems necessary to develop an exclusive herbicide for Italian ryegrass cultivation.

• 한국작물학회지
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• 제65권4호
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• pp.294-302
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• 2020

등숙기간 동안의 온도에 따라서 동일한 출수 후 일수가 경과하더라도 출수 후 적산온도가 달라져 종실의 등숙단계가 달라지기 때문에 수발아에 영향을 줄 수 있는 종실의 특성이 달라지게 된다. 그렇기 때문에 수발아 검정을 위한 처리 시점은 출수 후 일수가 아닌 출수 후 특정 적산온도에 조건을 맞춰 시험을 진행해야 한다. 한편 수발아 발생은 등숙기간 동안의 온도에 따라서 크게 달라진다. 이에 따라서 발생하는 전분립의 구조, 전분함량 및 ABA함량의 변이 등은 수발아 발생에 영향을 줄 것으로 생각되며, 특히 고온등숙 시 수발아 발생율의 증가와 종실 전분립의 구조, 유리당 함량 등 종실 이화학적 특성 변이와의 관계에 대한 추가적인 검토가 필요할 것으로 생각된다. 또한 고온등숙시 수발아 발생율이 증가하기 때문에 등숙기 고온에 노출되지 않도록 이앙시기를 조절하여 수발아 발생위험을 감소시켜야 한다.

• 한국작물학회지
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• 제66권1호
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• pp.1-7
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• 2021

쌀가루용 품종의 등숙기 온도에 따른 등숙특성 변이를 구명한 내용은 다음과 같다. 1. 고온(28℃)에서는 바로미2의 천립중이 21% 감소하면서 새누리(6% 감소)와 설갱(12% 감소)에 비해 크게 줄어들었으며, 전분함량의 감소 또한 바로미2에서 10% 이상으로 새누리와 설갱의 1~3% 감소와 대비되었다. 2. 저온(18℃)에서는 새누리나 설갱에 비해 바로미2의 등숙 속도가 매우 감소하였으며 특히 등숙 초반에 종실중의 증가가 매우 느렸다. 그러나 최종 천립중 및 전분함량은 22℃보다도 약간 증가하며 다른 품종과도 비슷한 것을 확인하였다. 3. 앞서 언급한 것처럼 쌀가루 가공용 품종 중 분질미(바로미2)는 등숙기 온도에 민감하기 때문에 추후 분질미 재배시 등숙기에 고온을 피할 수 있도록 이앙시기를 늦추는 편이 좋으며, 다만 과도하게 늦출 경우 저온조건에서 등숙기간을 제대로 확보하지 못하여 등숙이 충분히 되지 않을 수 있기 때문에 주의가 필요하다.

• 한국작물학회지
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• 제64권4호
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• pp.323-335
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• 2019

벼 주요재배 품종의 온도 및 일장에 따른 출수반응을 구명한 내용은 다음과 같다. 1. 온도에 따른 출수반응은 일장 12:00, 평균기온 22℃에서 28℃까지의 범위에서 1℃ 상승에 따라 평균 약 3.5일 정도 단축 되는 것을 확인하였으며, 온도가 상승 할수록 그 차이는 감소하는 경향을 보였다. 또한 온도에 따른 출수까지의 소요일수는 생태형별로 뚜렷한 차이를 보이지 못하였다. 2. 14:30과 12:00의 일장조건에 따른 출수까지의 소요일수 차이는 조생종 9.5일, 중생종 18.3일, 중만생종 23.5일로 온도반응과 달리 생태형간 뚜렷한 반응 차이를 보였으며, 일장조건이 짧아질수록 모든 생태형에서 일장반응에 따른 차이가 감소하는 것을 확인하였다. 3. 벼 주요 재배 품종의 화아분화 시점은 32일이었으며, 각 품종별 한계일장은 조생종인 운광, 오대, 고시히카리, 조평은 각각 19:20, 18:14, 18:58, 17:30이었다. 중생종인 대보, 하이아미, 삼덕은 각각 16:08, 16:15 및 16:55이었고, 중만생종인 새누리, 신동진, 추청, 삼광, 일품, 새일미, 황금누리, 동진찰, 일미, 호품, 영호진미는 각각 15:58, 15:56, 16:36, 16:44, 15:35, 16:26, 15:33, 16:20, 16:29, 16:13, 15:41이었다.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2022년도 추계학술대회
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• pp.120-120
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• 2022

Agrivoltaic System (AVS) was introduced with the concept that it could generate electricity by using the extra light remain after crops use for photosynthesis in farm, which can earn additional income. However, crop yield was declined under the AVS condition due to the decrease in light energy. In the past, many researchers have been studied about crop states under shading conditions. However, the phenomenon of partial shading such as under the AVS is not well studied. In this study, to figure out the response of crop under the different light conditions, the electron transport rate (ETR) and non-photochemical quenching (NPQ) of rice was investigated using the chlorophyll fluorescence measurement. Also, physiological changes of crops under the shading conditions were investigated. The growth experiment under partial shading under AVS and overall shading which made of 35% shade cloth was conducted to understand the eco-physiological responses of rice to light in terms of the photosynthesis. Under the shading conditions, SPAD value and chlorophyll contents were higher, but the leaf thickness was lower than control. The overall shading condition show lower ETR than others during the growing season. In contrast, NPQ was higher than other treatments. This means the available light energy cannot contribute to photosynthesis under the shading condition.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2022년도 추계학술대회
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• pp.168-168
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• 2022

According to the 5th Climate Change Report, global average temperature in 2081~2100 will increase 1.8℃ based on RCP 4.5 and 3.7℃ based on RCP 8.5 from the current climate value (IPCC Working Group I AR5). As temperature is expected to increase due to global warming and the intensity and frequency of rainfall are expected to increase, damage to crops is expected, and countermeasures must be taken. This study intends to evaluate rice growth in terms of nitrogen utilization efficiency according to future climate change conditions. In this experiment, Oryza sativa cv. Shindongjin were planted at the SPAR facility of the NICS in Wanju-gun, Jeollabuk-do on June 10, and were planted and grown according to the standard cultivation method. Cultivation conditions are high temperature, high CO₂ (current temperature+4.7℃·CO₂ 800ppm), high temperature (current temperature+4.7℃·CO₂ 400ppm), current climate (current tempreture·CO₂ 400 ppm). Nitrogen was varied as 0, 9, 18 kg/10a. The N content and C/N ratio of all rice leaves, stems, and seeds increased at high temperature, and the N content and C/N ratio decreased under high temperature and high CO₂ conditions com pared to high temperature. Compared to the current climate, NUE increases by about 8% under high temperature and high CO₂ conditions and by about 2% under high temperature conditions. This seems to be because the increase in temperature and CO₂ induced the increase in biomass. ANUE related to yield decreased by about 70% compared to the current climate under high temperature conditions, and decreased by about 45% at high temperature and high CO₂, showing a tendency to decrease compared to high temperature. This appears to be due to reduced fertility and poor ripening due to high temperature stress. However, as the nitrogen increased, the number of ears and the number of grains increased, slightly offsetting the production reduction factor.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2007년도 6th OSONG INTERNATIONAL BIO-SYMPOSIUM
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• pp.212.1-212.1
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• 2007

• 식물조직배양학회지
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• 제27권5호
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• pp.401-405
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• 2000

Influence of fructose addition to the cultivation medium on the production of taxanes and the growth of callus culture of Taxus baccata was studied. The cultures showed an ability to adjust to the substitution of some of the sucrose in the media by fructose and the fresh biomass accumulation was higher on the media containing different concentrations of fructose during the second cultivation period.

• 한국작물학회지
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• 제66권4호
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• pp.279-288
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• 2021

벼 드문모심기는 노동력과 생산비용을 절감할 수 있는 재배기술로 본 연구에서는 드문모심기의 적정 재식밀도 설정을 위해 분얼특성이 다른 품종별 생육 및 수량을 분석하였다. 37주~80주/3.3 m² 재식밀도에서 소얼형, 중간형, 다얼형 품종을 가지고 시험한 결과는 다음과 같다. 1. 재식밀도는 낮아질수록 주당 분얼수(이삭수)는 많아지지만 면적당 분얼수(이삭수)는 적어졌는데 소얼형 품종일수록 적었다. 분얼 발생기간이 길어졌고 소얼형 품종에서 가장 길어졌다. 2. 재식밀도 감소에 따라 출수기 직전의 엽색은 진해지고 군락피복도는 감소하였다. 분얼이 많은 호평과 예찬보다는 소얼형인 신동진에서 변화폭이 컸다. 3. 출수기는 재식밀도가 낮아질수록 0~2일 늦춰지는 경향을 보였고 수전기간은 차이가 나지 않았다. 4. 재식밀도 감소에 따라 천립중은 유의한 차이가 없었다. 반면 재식밀도가 줄어들면서 면적당 영화수와 등숙률의 저하로 수량이 감소되었다. 5. 안정적인 드문모심기 재배를 위한 재식밀도는 50주/3.3 m² 이상으로 판단된다. 또한 소얼형인 신동진이 재식밀도 감소에 따른 생육 및 수량 감소가 큰 것으로 나타나 분얼이 적은 품종보다는 많은 품종을 선택하여야 할 것으로 생각된다.