• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2002.07a
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• pp.108-113
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• 2002

우리 식생활에서 중요한 위치를 차지하고 있는 배추는 최근 식생활패턴 변화에 따라 외식 소비와 여성의 사회활동 증가, 가공원료용 수요 및 김치수출 증가 등으로 신선배추수요가 연중 평준화되어 안정적이고 지속적인 공급을 필요로 하고 있다. 그러나 배추재배 기계화는 경운정지, 비닐피복 및 방제작업을 제외하고는 대부분의 작업을 인력에 의존하고 있어 노동생산성 저하 및 생산비 증가의 원인이 되고 있다. 특히, 배추의 생산비 절감 및 안정적인 공급을 위해서는 전체 노동투하시간의 43%를 차지하고 있는 정식, 수확 및 제초작업 등 인력의존도가 높은 작업에 대한 기계화가 시급한 실정이다. (중략)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.05a
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• pp.134-135
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• 2000

개조개는 모시조개와 그 형태가 유사하지만 모시조개와는 달리 패각 길이는 약 10cm이고 패각의 내면이 진한 자색을 띄는 것이 특이하다. 이 조개는 여수, 남해 및 마산등의 앞 바다에서 연중 생산되고 있으며 조간대에서 수심 20m부근의 작은 돌이 섞여있는 모래 바닥에 서식하고 있다. 이 패류는 순수한 자연산으로써 고가 일뿐 아니라 최근 기호 식품으로 수요가 늘어 조리 방법도 된장찌개, 해물탕, 구이, 무침 및 미역국 등에 넣어 먹는 등 다양하게 이용되고 있다. 이와 같이 고급패류인데도 불구하고 지금까지는 개조개에 대한 식품학적 연구가 이루어지지 않았으므로 개조개 중의 유용한 성분의 계절적 변화를 밝히므로써 고도의 이용가공에 관한 기초자료를 얻고자 하였다. (중략)

• Korean Journal of Environmental Biology
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• v.18 no.1
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• pp.77-93
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• 2000

Field survey on the spatio-temporal distribution of water quality and chlorophyll a concentration, and the environmental factors on the variation of phytoplankton biomass were carried out at the 23 stations for four seasons in the Shiahae, southwestern coast of Korean Peninsula from February to October in 1995. I made an analysis on biological factor as chlorophyll a concentration as well as environmental factors such as water temperature, salinity and nutrients; ammonia, nitrite, nitrate, dissolved inorganic nitrogen, phosphate, N/P ratio, silicate and Si/P ratio. The waters in the Shiahae were not stratified due to the tidal mixing and high velocity of tidal current. And the high productivity in photic layer were supported by high nutrients concentration from freshwater on lands and bottom waters The low depth of transparency in the Shiahae had a bad influence upon primary production and marine biology. In Shiahae had a sufficient nutrients for primary production during a year. Especially dissolved inorganic nitrogen and silicate were high, the other side, phosphate was low. The source of nutrients in summer and silicate supply depend on input of freshwater from lands, the other side, dissolved inorganic nitrogen and phosphate were depend on rather supplied from bottom layer by the mixing and input of seawater from outside than input of freshwater from lands. Phosphate seemed to become a limiting nutrient for the primary production at all area of Shiahae in winter and at the northern parts in other seasons. However, dissolved inorganic nitrogen seemed to do it at the southern parts in other seasons except winter. Silicate didn't become a limiting nutrient for diatoms in Shiahae. Phytoplankton biomass as measured by chlorophyll a concentration was very high all the year round, it was controlled by the combination of the several environmental factors, especially of nitrogen, phosphorus and the physical factors such as light intensity. [Spatio-temporal distribution, Seasonal fluctuation, Nnutrients, Chlorophyll a, Environmental factors, Nutrient source, Limiting Nutrient, Light, Shiahae] .

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.8
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• pp.579-592
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• 2020

This study was designed to assess the water quality and phytoplankton community including chlorophyll a in blood cockle (Tegillarca granosa) farms in May, August and November of 2017 in the northwestern Yeoja Bay, Korea. As a result, the seasonal characteristics of water types by water temperature and salinity were clear. Nutrients were abundant in silicate throughout the season, but phosphate was scarce in spring and summer, and nitrogen sources were scarce in autumn. The species composition of phytoplankton community was a very simple distribution, and the standing crop was also very low. The annual dominant species is dominated by the diatoms, with Skeletonema costatum-ls, Nitzschia longissima in spring, Pleurrosigma normanii, Coscinodiscus gigas in summer, and N. longissima, Pseudonitschia pungens, Chaetoceros curvisetus, Eucampia zodiacus in autumn. In summer the results were different from other coastal waters of Korea. The principal component analysis(PCA) and correlation analysis showed that the characteristics of water quality and biological environments differed according to the season. Furthermore, it was determined by the supply of materials through fresh water on land, seawater congestion caused by the refueling of surface sediments with lower depth, and the balance of biological production and mineralization of organic matters in blood cockle farms.

• The Korean Journal of Ecology
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• v.17 no.3
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• pp.345-353
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• 1994

Litter production and decomposition were investigated for 2 years in the oak, Quercus acutissima, and the pitch pine, Pinus rigida, stands in the vicinity of Kongju, Chungnam Province. Litter production was measured with litter trap at monthly basis. Litterbag method was used for the measurement of litter decomposition. Litter producion continued throughout the year, but showed a peak in autumn. Second peak in May or June was caused by falling of bud scales and reproductive organs. Average litter production in the oak and the pitch pine stands were $567.1g{\cdot}m^{-2}{\cdot}yr^{-1}\;and\;653.2g{\cdot}m^{-2}{\cdot}yr^{-1}$, respectively. Litter production in this study area were higher than those in other reports. Nutrient concentrations in litter were the highest in summer when the least litter production occurred, and the lowest in autumn when the greatest litter production occurred, except for calcium in the oak stand. Nutrient concentrations of the oak litter were higher than those in the pitch pine litter. After 1 year, % remaining mass of oak and pitch pine litter was 43.6% and 58%, respectively. After 21 months elapsed, % remaining mass of oak and pitch pine litter was 22.2% and 33.2%, respectively.

• Journal of The Korean Society of Grassland and Forage Science
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• v.44 no.1
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• pp.6-13
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• 2024

This study was conducted to determine the optimal spring seeding dates for alfalfa yield and feed value. The experiment was conducted annually for three years (2021~2023) at the field in the Department of Animal Resources Development, NIAS, located in Cheonan. The treatments involved six seeding dates ranging from February 24 to April 14, with 10days intervals. Alfalfa was harvested four times a year at the early flowering stage. Dry matter yield showed a tendency to decrease with delayed the seeding date. However, depending on the climatidc condisions in the seeding year, the dry matter yield on March 14 or 24 was comparable to that on February 24. Annual dry matter yield varied, influenced by the daylight conditions each year. The average feed value did not significantly differ within in the same year with delayed seeding dates (p>0.05). Therefore, the most stable period for alfalfa spring seeding in the central area of South Korea is considered to be from February 24 to April 4, with February 24 indentified as the optimal date.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.10
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• pp.48-53
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• 2017

One of the policies of the Ministry of Agriculture, Forestry and Livestock Food and Livestock aims to export $10 billion worth of products. Although it was not easy to achieve the export goal of $ 6.5 billion in 2016, the policy should be pursued continuously. Accordingly, a facility modernization project and high-tech greenhouse project are being implemented to facilitate exports. Moreover, it is possible to consider substitution of imports in the policy shift. Imports of temperate and tropical fresh fruits totaled 1.2 trillion won in 2016. Accordingly, identification of alternatives to tropical and temperate fresh fruit imports will enable farm income to increase and the fresh fruit industry to grow. The major obstacle to tropical fruit production in Korea is high heating costs. However, Jeju Island apple mango farmers found that using non-taxable kerosene and hot water from power plants could reduce heating costs by 42.5%. Indeed, using hot wastewater can reduce heating costs by more than 40%. To improve competition with imported fruits, farmers can change their heating systems using financial support plans (e.g., 20% government subsidies, 20% loans, 30% subsidies from local governments). The income effect and import substitution effect of fruit tree farmers should be carefully analyzed in the future and the study will be closed to discuss the policy direction.

• Journal of Bio-Environment Control
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• v.12 no.1
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• pp.1-6
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• 2003

This study was conducted under the condition of greenhouse to investigate the relationships between the period of long day (LD) treatment before short day treatment, the dry matter production and flower quality of cut chrysanthemum (Indicum group) cv. Reagan Improved at Wagenigen University in the Netherlands. Rooted cuttings of chrysanthemum (Indicum group) cv. Reagan Improved were transplanted on 6th, 13th, loth of September and all of them were treated with short-days (SD) on 21th September. The periods from planting until final harvest were 70, 77, 84 days after being planted for 1, 2, and 3 week-LD period, respectively. The time of flower initiation was similar in all treatments. The number of flowers per plant was greater in the plot of 3 week-LD period than that in the plot of 1 or 2 week-LD period. The fresh weight and dry weight of flowers also increased more in the plot of 3 week-LD period than that in the 1 week-LD period by 4g and 0.4g, respectively. The final dry matter production ($g{\cdot}m$^{-2}$ ) was greater in the treatment of 3 week-LD period than 1 or 2week-LD period. In this study, LD period before short day treatment did not affect the time of flower initiation and flower quality. As a result, 3 week-LD period before short day treatment was strongly recommanded for producing high quality cut flowers of greenhouse-grown chrysanthemum.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2020.08a
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• pp.69-69
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• 2020

식물체가 건조 스트레스를 받으면 각 기관 물질 생산의 변이, 분화 및 발달 억제를 통해서 식물의 생산활동을 현저히 저하시켜, 식물의 생장, 형태, 개체발생 및 대사생리에 영향을 미치는 것으로 연구되어 왔다. 최근 기후 온난화로 인해 온도가 점진적으로 상승하고 가뭄과 같은 이상기상이 빈번하게 발생함에 따라 많은 노지 작물의 농업 생산성이 약화되고 있다. 배추는 우리나라의 대표적인 식품 중 하나인 김치의 주재료로 연중 안정적인 생산과 공급이 필요시 되지만, 배추의 경우 건조 조건에서 엽육조직의 붕괴와 같은 생리장해가 발생되기 때문에 최근 발생되고 있는 이상 기후의 영향으로 안정적인 생산이 어려워지고 있는 실정이다. 하지만, 배추에서는 이상 기후에 대응이 가능한 내건성 품종의 육성을 위한 연구는 미흡한 실정이다. 따라서 본 연구에서는 내건성이 높은 배추 개발을 위한 기초소재를 찾는 것을 목적으로 농촌진흥청 유전자원센터에서 보존하고 있는 재래종 배추 30계통을 분양받아 강릉원주대학교 생명과학대학 내의 조직배양실을 이용하여 연구를 수행하였다. 배지는 Tissue Culture Square Dish(125×125×20mm)에 Agar를 녹여 40ml씩 분주하여 고체배지를 조성한 후, 건조 처리구 Polyrthylene glycol 6000(PEG) 0%(Control), 20%(Mild Stress), 30%(Severe Stress)를 설정하여 60ml씩 추가 분주하여 배양기 28℃에서 15시간 처리를 하였다. 분양받은 각 계통의 종자는 1% 차아염소산 나트륨으로 10분간 종자표면을 살균한 후, 5번 정도 멸균수로 헹군 후, 표면 살균한 재래종 종자를 고체배지 시험관에 6립씩 치상하였다. 식물체 생육은 각 처리구별 3반복으로 하였으며 주간 12시간 주기, 광도 2,400Lux, 온도 20℃의 조직배양실에서 치상 후 7일간 생육하였다. 치상 후 7일간 생육시킨 식물체를 채취하여 지상부생체중, 지하부 생체중, 뿌리 길이를 측정하였으며, 지상부와 지하부로 나누어 50℃에서 72시간 건조시킨 후, 건물 생산량을 조사하였다. 본 실험 결과 건조 처리(PEG-6000)는 배추의 생장을 저해하였지만, 생육 저해 정도는 계통간의 차이가 있는 것을 관찰할 수 있었으며 무처리구와 스트레스 처리구간의 생장량 변화 정도를 기반으로 군집분석을 수행한 결과 'IT110483'과 'IT104903' 계통이 실험에 공시된 계통들 중 상대적으로 강한 건조 내성을 가진 것을 확인할 수 있었다. 따라서, 재래종 배추 계통 중 일부는 건조내성이 강한 새로운 배추 품종을 육성하는데 있어 유용하게 이용될 수 있을 것으로 사료된다.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2003.07a
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• pp.334-340
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• 2003

풋고추의 재배면적은 시설채소 면적이 증가하면서 연중 생산이 가능하게 되어 급속히 증가하고 있으며 신선 채소류에 대한 선호도가 늘어나면서 풋고추의 소비량이 늘어나고 있다. 2001년 현재 고추의 시설재배 면적은 5,517㏊로써 과채류 시설재배면적의 10%를 차지하고 있다. 재배지역별로는 경남, 전남, 광주, 충남지역이 전체 재배면적의 73%를 차지하고 있으며 풋고추는 시설재배로 대부분이 주산단지로 이루어져 있어 선별작업기계화가 요망되고 있다. 이와 같이 풋고추선별에 대한 기계화 요구도가 높은 반면 아직까지 풋고추의 선별작업은 전적으로 인력에 의존하므로 많은 노동력이 소요되며 작업능률이 낮고 육안에 의존하기 때문에 정확한 크기선별이 곤란한 실정이다. 또한 고추의 선별ㆍ포장에 소요되는 작업노력으로 인하여 주산지별로 선택ㆍ포장 작업의 기계화 요구도가 높다. (중략)