• 한국작물학회:학술대회논문집
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• 한국작물학회 1991년도 춘계 학술대회지
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• pp.30-31
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• 1991

• 한국잡초학회지
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• 제30권2호
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• pp.103-110
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• 2010

일년생 잡초인 물달개비 및 올챙이고랭이의 출아와 초기생장을 예측하기 위한 모델 구축을 위하여 온도조건을 달리한 식물생장상에서 포트실험을 수행하였다. 이들 잡초의 출아 및 초기생장과 유효적산온도와의 관계를 비선형회귀로 분석한 결과 온도조건에 상관없이 각각 Gompertz 모델 및 logistic 모델로 설명이 잘 되었다. 물달개비 및 올챙이고랭이의 최대 출아율의 50%에 필요한 유효적산온도는 각각 69.3 및 $94.8^{\circ}C$이었으며, 4엽기에 이르는데 필요한 유효 적산온도는 각각 247 및 $234^{\circ}C$이었다. 본 연구에서 개발된 모델로 분석한 결과 평균 기온이 $3^{\circ}C$ 상승하게 되면 이들 잡초의 50% 출아는 물달개비의 경우 1일, 올챙이고랭이의 경우는 2일 빨라지고, 4엽기에 다 다르는 날짜는 이들 잡초 모두 3일이 빨라질 것으로 예측되었다. 따라서 온도상승조건에서 물달개비 및 올챙이고랭이를 효과적으로 방제하기 위해서는 현재의 처리시기보다 약 2-3일 빨라져야 할 것으로 예상된다.

• 한국자원식물학회지
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• 제32권6호
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• pp.683-688
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• 2019

This study was conducted to determine the number of days required to break a plant's dormancy and promote subsequent crop growth in new varieties of Gomchwi through the 4℃ treatment. Three new varieties of Gomchwi namely, 'Sammany', 'Gommany', and 'Damogy' were observed in this study. The rate of leaf emergence of 'Sammany' after 15-day of 4℃ treatment was 100%, while 'Gommany', and 'Damogy' took 20-days and 10-days, respectively to reach to 97.9% rate of leaf emergence. After 10-days of 4℃ treatment, 'Damogy' grew faster than the other varieties. and Harvest time for 'Damogy' was on January 18^th, after 5-days of 4℃ treatment and yield was observed to be the highest at 15-days of 4℃ treatment. 'Sammany' was next with a minimum of 10-days of 4℃ treatment, although 15-days is more preferred for better harvest. 'Gommany' on the other hand, did not grow enough for harvest by January 18^th, and its harvest time was delayed to January 31^st. It needed a minimum of 15-days and preferentially 20-days of 4℃ treatment to grow normally and be ready for harvest. The plant height, leaf length and leaf petiole length appeared to grow better by extending duration of the 4℃ treatment. The number of leaves of 'Sammany' and 'Gommany' varieties was three leaves for the 5-days treatment which may be due to the incomplete breaking of dormancy. Regarding the yield per plant, 'Sammany' yielded 112.3 grams (g) in 15-days treatment, and 'Gommany' yielded 106.5 g in 25-days treatment. In the case of 'Damogy', it yielded 123.5 g and 183 g in the 10-days and 25-days treatment respectively. It is concluded that 'Damogy', 'Sammany' and 'Gommany requires 10, 15, and 20 days of 4℃ treatment to break the plant's dormancy and promote better plant growth.

• 한국응용곤충학회지
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• 제42권4호
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• pp.335-343
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• 2003

파굴파리의 파 잎의 가해 습성을 조사한 결과 암컷성충은 잎의 외부에서 즙액을 섭취하고 엽육에 산란함으로서 피해를 주었다. 피해 잎은 직경 0.48mm의 백색 원형의 흡즙흔이 수십 개씩 점선을 형성하였고, 산란흔은 0.1${\times}$0.14mm 장타원형이고 1개 또는 수 개씩 V자형으로 무리를 지어 산란하였다 집단사육에서 성충의 흡즙은 우화당일에 시작하여 4-5일째에 가장 왕성하였고, 산란은 우화 2일부터 6일째까지 일별 산란수가 비슷하였다. 또한 흡즙과 산란은 밤보다는 낮에 더 활발하였다. 유충은 엽육에 갱도를 뚫고 엽의 위아래로 섭식하다가 밀도가 높고 발육이 진전되면 잎 끝쪽에서부터 아래쪽으로 이동하면서 잎을 고사시켰다. 유충 1마리의 식해량은 72.1$\textrm{mm}^2$이었다. 노숙유충이 잎에서 탈출하는 시간은 오전 5-7시이었고, 번데기는 토양깊이 5cm, 파측면 10 cm근처에서 대부분 용화하였다. 월동태는 번데기로 지표에서 토양깊이 10cm 이내에서 서식하였으며, 5월상순부터 6월하순까지 약 2개월 사이에 우화하였다. 성충은 잔존된 파, 묘상, 이식된 포장, 밭뚝 등으로 이동하여 생존하였다.

• 한국환경과학회지
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• 제33권6호
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• pp.383-402
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• 2024

Variations in lettuce growth and quality were observed depending on the type of artificial light source. The RGB LED treatment resulted in thick leaf development, leading to higher fresh weight, dry weight, and relative growth rates. Two cultivars, "Tomalin" and "seonpunggold," exhibited increased anthocyanin content and dark red leaf color under conditions of RGB LED treatment. Additionally, they exhibited high chlorophyll content under conditions of RGB LED and RGBFR LED treatments. Particularly, under Red LED treatment, the plants showed elongated leaves with narrow widths, resulting in a higher leaf shape index and a tendency towards leaf curling. Therefore, RGB LED lighting which appropriately blends red, blue, and green lights, is more effective than single lighr sources at improving lettuce growth and quality.

• 한국초지조사료학회지
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• 제4권2호
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• pp.158-163
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• 1983

種實用 수수와 수단그라스의 交雜種인 Pioneer 988의, 窒素施肥水準에 따른 時期別 生育 및 乾物生産量을 조사하기 위하여 本 硏究를 실시하였다. 窒素肥科는 成分量으로 10a當 15, 25, 35kg을 施用하였으며 幼植物로부터 開花後期까지의 生育期間게 몇가지 特性을 調麥한바 그 結果는 다음과 같이 要約된다. 1. 出現葉數는 生育이 進行됨에 따라 증가했는데 穗孕期까지 급격한 증가를 보였고, 出穗期에는 最終葉인 15葉이 出現했다. 2. 葉面積指數는 生育의 進行에 따라 증가했는데, 특히 穗孕期까지 그 增加가 급격했으며, 室素施肥水準別로는 幼穗分化期까지 15kg 施肥區에서 컷으나 穗孕期 以後에는 35kg 施肥區에서 컷다. 3. 乾物收量은 穗孕期 以前에는 15kg 施肥區에서 많았으나, 穗孕期 以後에는 35kg 施肥區에서 많았다. 4 乾物生産速度는 純同化率 및 平均 葉面積指數와 밀접한 관계가 있었으며 生育後期에는 純同化率의 增加와 더욱 밀접한 관계를 나타냈다.

• 한국작물학회지
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• 제53권4호
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• pp.434-439
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• 2008

The amount of salt to make seed sorting solution of the specific gravity of 1.13 was reconsidered and determined as 3.8 kg salt in 18 L water, which is lower amount than currently used. Five rice cultivars were examined. Percent germination and seedling emergence were not similar. Seedling emergence rate of Japonica varieties, Nampyungbyeo and Daerypbyeo-1 were 87% and 95% under specific gravity of 1.13, respectively. Seedling emergence rate of Tongil type variety, Dasanbyeo was as high as 67% in specific gravity of 1.06. Seedling emergence rate of waxy rice, Hwasunchalbyeo and Aranghangchalbyeo were examined. Seedling emergence rate was 94% in both cultivars in specific gravity of 1.04. Seedling emergence rate was same in specific gravity of 1.08 which is generally used for selecting seed currently. Early growth (plant height, leaf number, and dry weight) were not significantly different by specific gravity within species. In all cultivars except waxy rice, highest seedling emergence rate was observed in specific gravity of 1.13 which is currently used for selection and decreased as specific gravity is lowed. However, considering total amount of seeds in each group of specific gravity, amount of seed in lower specific gravity group is relatively small and total seedling emergence rate within variety dose not show big difference. However, if seeds with low speicific gravity are produced due to the bad grain filling condition and consequently total seed content of low specific gravity increases, results will be differnt. Reduction in total growth and yield could occur. It will be important to comply with the seed sorting criterion of 1.13 for Japonica, 1.06 for Tongil, and 1.04 for waxy rice variety to ensure the maximum rice growth and yield.

• 한국작물학회지
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• 제45권6호
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• pp.366-369
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• 2000

춘파재배시 파종기에 따른 생육단계별 적산온도, 소요일수, 엽 전개 및 수량에 미치는 영향을 검토하기 위하여, 파성 I인 사천6호와 파성 IV인 새찰쌀보리를 공시하여 2월23일부터 10 및 간격으로 4시기에 파종하여 시험한 결과는 다음과 같았다. 1.사천6호를 2월 23일 파종하면 6월 16일에 성숙하여 생육일수가 111일 소요되었고, 3월 24일 파종하면 6월 21일에 성숙하여 생육일수는 87일 소요되었다. 파종이 늦어지면 생육일수가 단축되어 성숙기는 비슷하여지는데 이는 주로 파종에서 출수까지 일수가 단축되기 때문이었다. 2. 품종에 따라 적산온도는 출현까치는 111-142$^{\circ}C$, 출수까지는 683-756$^{\circ}C$, 성숙까지는 1274-1326$^{\circ}C$ 소요되었다 추파성인 새찰쌀보리는 만파하면 파성이 완전히 소거되지 않아 성숙까지의 적산온도는 다른 시기에 비하여 많았다. 3. 2월 23일 파종한 사천6호는 엽이 하루에 0.1938개 전개되었으나 3월 24일 파종은 0.2156개 전개되어 파종이 늦을수록 엽전개는 빨라졌다 새찰쌀보리도 3월 24일 파종을 제외하고 같은 경향이었다. 4. 파종이 늦을수록 천립중이 감소하고 설립이 증가하여 수량이 감소하였는데, 사천6호의 2월 23일 파종은 수량이 10a당 299kg에 비하여 3월 24일 파종은 125kg으로 수량이 크게 감소하였다. 5. 춘파보리는 파성이 낮고 대립종인 사천6호가 좋았고, 가능한 일찍 파종하는 것이 좋고, 수원지방에서 늦어도 3월 10일 이전에 파종하여야 수량감소를 최소화할 수 있었다.

• Journal of Ecology and Environment
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• 제33권4호
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• pp.299-306
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• 2010

The use of local seed provenance is often recommended in forest restoration. Early vigor is a combination of the performance of seed germination and emergence after planting. The ability of young Brant's oak plants to grow and develop after emergence and its dependence on local habitat conditions was investigated in this study. The effects of seed source and shade on early growing seedlings of Brant's oak (Quercus brantii L.) were determined in field measurements. Seeds of Quercus brantii L. were collected from 4 forest areas (seed sources) in southern Zagros (Provinces of Kohkilouyeh-Bouyer Ahmad and Fars) at altitudes of 850, 1,100, 1,500, 2,100 m a.s.l., and planted in a nursery constructed in southwestern Iran. According to a split-plot design consisting of four blocks, each containing two main treatment plots (no shading, partial shading), each main plot was sub-divided into four sub-plots (for elevations of 850, 1,100, 1,500 and 2,100 m). Results showed that shade treatments had significant effects on emergence percentage and rate, shoot length, shoot dry weight (SDW), root dry weight (RDW), leaf area (LA), and chlorophyll content. Ecological factors also had an effect on seed performance. Altitude of seed source had a very significant effect on root length, LA, SDW, and RDW. The seeds collected from 850 m a.s.l. elevation showed the highest performance, especially in leaf area, root length, shoot dry weight, and root dry weight. Our results showed that the altitude of 850 m a.s.l. was the best for collecting Brant's oak seeds.

• 한국작물학회지
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• 제44권2호
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• pp.149-153
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• 1999

Prediction of rice developmental stage is necessary for proper crop management and a prerequisite for growth simulation as well. The objectives of the present study were to find out the relationship between the plastochrone index(PI) and the developmental index(DVI) estimated by non-parametric phenology model which simulates the duration from seedling emergence(DVI=0) to heading(DVI=l) by employing daily mean air temperature and daylength as predictor variables, and to confirm the correspondency of developmental indice to panicle developmental stages based on this relationship. Four japonica rice cultivars, Kwanakbyeo, Sangpungbyeo, Dongjinbyeo, and Palgumbyeo which range from very early to very late in maturity, were grown by sowing directly in dry paddy field five times at an interval of two weeks. Data for seedling emergence, leaf appearance, differentiation stage of primary rachis branch and heading were collected. The non-parametric phenology model predicted well the duration from seedling emergence to heading with errors of less than three days in all sowings and cultivars. PI was calculated for every leaf appearance and related to the developmental index estimated for corresponding PI. The stepwise polynomial analysis produced highly significant square-rooted cubic or biquadratic equations depending on cultivars, and highly significant square-rooted biquadratic equation for pooled data across cultivars without any considerable reduction in accuracy compared to that for each cultivar. To confirm the applicability of this equation in predicting the panicle developmental stage, DVI at differentiation stage of primary rachis branch primordium was calculated by substituting PI with 82 corresponding to this stage, and the duration reaching this DVI from seedling emergence was estimated. The estimated duration revealed a good agreement with that observed in all sowings and cultivars. The deviations between the estimated and the observed were not greater than three days, and significant difference in accuracy was not found for predicting this developmental stage between those equations derived for each cultivar and for pooled data across all cultivars tested.