• 한국약용작물학회:학술대회논문집
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• 한국약용작물학회 2011년도 춘계학술발표회
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• pp.100-101
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• 2011

• Korean Journal of Medicinal Crop Science
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• 제7권4호
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• pp.269-274
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• 1999

This experiment was carried out to investigate the effect of rain shelter cultivation on the its quality of safflower. The development and growth of safflower, especially the number of secondary branches per plant was increased by rain shelter. Under the rain shelter started earlier, the seed yield was increased by 95% compared with that of non-shelter condition. The number of plants in a unit area the number of flower buds and seeds per plant and seed weight were increased in rain shelter condition. As those plants were cultivated under the rain shelter, lightness(L) of their seeds was increased but redness (a) and yellowness (b) were decreased.

• Korean Journal of Medicinal Crop Science
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• 제7권1호
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• pp.22-26
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• 1999

This study was investigated to elucidate the growth characteristics of Acanthopanax sessiliflorus grown under different conditions and seasons. The emergence percent of seeds sown in the vinyl house was about 2.2 times better than that in the open field. The plants which had 2 to 3 normal leaves showed the highest value in root setting percent, and the root setting percent was decreased significantly in plants with one normal leaf and 4 to 5 normal leaves. The root setting percent of plants transplanted from April 19 to May 2 was 100%, but plants transplanted at April 4 or from May 17 to June 1 showed lower root setting. Tree percent, plant height. root length and fresh weight of plants grown by transplanting culture were better than those of plants grown by direct seeding.

• Korean Journal of Soil Science and Fertilizer
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• 제27권3호
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• pp.238-246
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• 1994

Rate of conventional allpication of chemical fertilizer and farm manure were surveyed for 23 crops and 13,259 farms on paddy and upland fields in 1992. 1. Farmers have applied fertilizers more than optimum levels on vagetable crops. Based on the optimum levels of N, P and K, the excess ratios of N, P, K fertilization were 40%, 138%, and 53% in vagetable crops and 38%, 7%, and 0% in field crops, respectively. 2. Among provinces, the fertilizer application for paddy rice was higher in Chung-nam and Jeon-buk, which have had higher yield compared to other provinces. And that for red pepper was higher in Kang-won, Jeon-nam, Jeon-buk, Kyeong-nam, Kyeong-buk, and for chinese cabbage in Kang-won and Chung-nam. 3. The fertilizers rates at a chief producing districts of crops(CPD) were higher in vagetable crops than in field crops. 4. Compared with total fertilizer levels of open culture, excess fertilizers in plastic house were 5.9kg/10a(21%) of nitrogen, 8.7kg/10a(52%) of phosphorus and 7.1kg/10a(34%) of potasium. In chemical fertilizer application, fertilizer levels of sweet corn, red papper, tomato and lettuce were higher in plastic house, while those of cucumber, strawberry, radish, chinese cabbage were higher in open culture. 5. Ratio of farmers who applied farm manures was below 60 % on field crops and 69~100% on vagetable crops. 6. The compound fertilizer for paddy rice(21-17-17) was applied on all the crops and its application rate was the highest in all the crops except for paddy rice(single cropping), malting barley, soybean, sesame.

• Journal of the Korea Academia-Industrial cooperation Society
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• 제21권4호
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• pp.538-545
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• 2020

This study measured the economic impact (from 2012 through the end of 2017) of the KOR-USA FTA (Free Trade Agreement) on the Korean citrus industry according to importing orange from the USA after the implementation of the KOR-USA FTA. Citrus fruits were divided into field citrus grown in open fields, house citrus grown in green houses, and late-maturing citrus (including winter season citrus) based on the cultivation methods and the varieties of citrus. We specified the structural and dynamic recursive demand-supply equilibrium models of three citrus fruits to analyze policy simulations. The results showed that for field citrus, due to the impact of some amounts of TRQ, the annual average of the real gross revenue dropped by 2.39 billion KRW between 2012 and 2017. As for house citrus, due to the impact of oranges and cherries, the annual average of the real gross revenue declined by 3.01 billion KRW between 2012 and 2017, and for late-maturing citrus (including winter season citrus), the annual average of the real gross revenue fell by 15.11 billion KRW between 2012 and 2017. This paper also suggests several policy implications.

• Journal of Internet of Things and Convergence
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• 제8권2호
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• pp.35-40
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• 2022

In the agricultural environment, pesticide control requires a high risk of work and a high labor force for farmers. The effectiveness of pesticide control using unmanned aerial vehicles varies according to climate, land type, and characteristics of unmanned aerial vehicles. Therefore, an effective method for pesticide control by unmanned aerial vehicles considering the spraying conditions and environmental conditions is required. In this paper, we propose an efficient pesticide control system based on agricultural unmanned aerial vehicles considering the application conditions and environmental information for each crop. The effectiveness of the proposed model was demonstrated by measuring the drop uniformity of pesticides according to the change in altitude and speed after attaching the sensory paper and measuring the penetration rate of the drug inside the canopy according to the change in crop growth conditions. Experiment result, the closer the height of the UAV is to the ground, the more evenly the crops are sprayed, but for safety reasons, 2m more is suitable, and on average a speed of 2m/s is most suitable for control. The proposed control system is expected to help develop intelligent services based on the use of various unmanned aerial vehicles in agricultural environments.

• Proceedings of the Korea Water Resources Association Conference
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• 한국수자원학회 2015년도 학술발표회
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• pp.213-213
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• 2015

밭에서의 점적 관개를 이용한 노지 재배의 경우 적정 관개 계획 수립을 위해서는 작물 및 토양의 수분 정보에 대한 정확한 파악이 필요하다. 본 연구에서는 밭 토양을 GIS(Geographic Information System)를 통해 격자 형태로 분할하여 작물의 증발산량 및 토양의 수분함량을 모의할 수 있는 격자 기반 토양 물수지 모형을 개발하였다. 본 모형을 통해 작물의 소비수량 및 필요 수량을 파악함으로써 작부기간 중 필요한 관개수량을 제시하는 것이 가능하다. 고도화 기상자료로는 국가농림기상센터에서 운영 중인 고해상도 WRF(Weather Research and Forecasting) 모형에서 생산된 격자 형태의 복사, 온도, 바람, 강수 자료를 사용하였고 고도화 기상자료의 격자 해상도 별로 모의되는 작물 및 토양의 수분 정보 간 비교 및 분석을 실시하였다. 토양 물수지 모형에 입력되는 격자형태의 자료로는 기상, 토성 및 토지이용 자료가 있으며 기상자료의 경우 가로 및 세로의 크기가 각 270, 810, 2430m로 동일한 3가지 경우로 나누어 적용했으며 토성 및 토지이용 자료의 경우 기상 격자의 최소 크기에 맞춰 가로 및 세로의 크기가 각 270m인 격자로 분할하였다. 이와 같은 과정에 의한 모의 결과 각 격자별 작물 증발산량, 토양수분함량 및 관개수량의 일 연별 시계열 자료를 얻을 수 있으며 동시간대 격자별 수문인자 값을 산정하고 위치에 따른 공간적 상호 상관성을 분석하였다. 결과적으로, 고도화 기상자료의 격자 크기에 따른 밭 토양 물수지 분석 결과를 통해 고도화 기상 격자의 규모별 밭 토양 물수지 분석 효용성을 파악하고자 하였다. 더불어, 시험 지역(Test Bed) 선정을 통해 토양수분 및 증발산량을 실측하고 본 모형의 모의 결과와 비교함으로써 검정하는 것을 향후 연구 계획으로 한다.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 한국농업기계학회 2017년도 춘계공동학술대회
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• pp.61-61
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• 2017

노지 고추 수확작업은 100% 인력에 의존하고 있으며 7~9월에 걸쳐 5~6회의 다수의 작업이 수행되어 노동 강도가 크다. 또한 농촌의 고령화와 노동력 감소로 인하여 수확인력의 부족이 발생하고 있음에도 불구하고 시중에 유통되고 있는 고추 및 노지채소 수확작업 편이기기는 동력이 아닌 인력으로 이랑사이를 이동하며 작물을 수확하는 구조로 되어있다. 이는 노동 강도를 줄여주는 효과가 미미하기 때문에 동력이 수반된 편이장치가 필요하며 또한 적절한 모터 및 제어장치가 요구된다. 적절한 모터를 선정함에 있어서 영향을 주는 인자는 주행저항(RR)이며, 구성요소로는 구름마찰저항(Rr), 공기저항(RА), 등판저항(Rg), 가속저항(Ra)이 있으며, 다음과 같은 식으로 정의된다. 주행저항(RR)=구름마찰저항(Rr)+공기저항(RA)+등판저항(Rg)+가속저항(Ra) 구름마찰저항(Rr)=구름마찰저항계수(${\mu}$)${\times}$차량총중량(W) 등판저항(Rg)=차량총중량(W)${\times}Sin{\theta}$ 공기저항(RА), 및 가속저항(Ra)은 1m/s 미만의 속도가 요구되기 때문에 무시할 수 있다. 동력원에서 최종 구동축으로 전달된 동력은 주행장치를 통하여 지면에 전달되고 이 동력에 의해 작업차의 주행장치에 추진력이 발생하며 주행장치의 추진력이 주행저항 이상이 될 때 작업차는 전진하게 된다. 따라서 작업차의 주행속도를 V(m/s), 전동기의 효율을 ${\mu}_m$, 동력전달효율을 ${\mu}_{TD}$라고 하면 다음과 같은 식이 산출된다. 전동기의 소요출력(P)=주행저항(RR)${\times}$속도(V)/전동기의 효율(${\mu}_m$)${\times}$동력전달효율(${\mu}_{TD}$) 구름마찰계수를 0.3이라고 할 때 포장의 경사도와 작업차의 주행속도 변화에 따른 주행소요 동력을 비교하였다. 주행소요동력은 포장의 경사각과 주행속도의 증가와 더불어 증가한다. 고추 및 노지채소 수확작업 편이장치의 작업시 요구되는 주행속도는 일반적으로 0.25m/s, 등반각은 5도이다. 이때 구동 전동기의 출력은 안전율을 고려하여 식에 의해 계산한 결과 1ps으로 산출 되었다. 선정한 구동모터의 감속비는 7.18 : 1, 에너지의 효율은 78 %, 기동토크는14 N/m 이며, 축전지의 경우 구동모터에 기반 하여 구입이 간편하고 상용화 되어있는 연축전지를 사용하여 교체 및 수리가 간단하도록 하였다. 축전지는 12V 18Ah의 축전지 2개를 사용한다.

• Korean Journal of Food Science and Technology
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• 제50권4호
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• pp.371-376
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• 2018

Consumption of wild edible greens (WEG) has risen in Korea recently, and processing of WEG at greenhouses is increasing. In this study, we investigated chamchwi (Aster scaber Thunb), a major WEG, to assess the effect of growth conditions on nutritional quality and blanching process. Field-grown chamchwi had 1.5-2-fold more total phenolic compounds and anti-oxidative capacity than the house-grown one. Among functional compounds, quercetin was significantly higher (about 5-fold) in the field samples (approximately $430{\mu}g/g$ fresh weight) than in the house samples. Soluble sugars in field-grown chamchwi were 2-fold higher than in the house samples. For both the samples, blanching process decreased chamchwi quality significantly, but the degree of loss for each component was different. Consequently, field-grown chamchwi exhibited superior nutritional quality than greenhouse-grown one, and blanching process resulted in a similar decrease of nutritional quality in both the samples.

• Korean Journal of Soil Science and Fertilizer
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• 제45권6호
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• pp.861-866
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• 2012

Water is the most important resource for the potato cultivation, especially to get the maximum water use efficiency and yield of potato, Water has to be applied moderately based on the water requirement of the potato. Crop water requirement (WR) is a function of the Potential evapo-transpiration(PET) and Crop coefficient (Kc). PET can be estimated by the climate data measured at the weather station in the production region. Kc was measured by the NIAST (RDA) through Lysimeter experiments. In this study, the growth stage of potato was divided as four (G-1 : Apr. 1~Apr. 15, G-2 : Apr. 16~May. 10, G-3 : May. 11~May. 31, G4 : Jun. 1~Jun. 15). The average PET during potato growing season of the 45 areas was $2.95mm\;day^{-1}$. The most water requirement was the G-3 stage among the potato growth stage. The MWR (Mean water requirement) according to growth stage was 1.0~1.2 (average 1.1), 1.5~1.8 (average 1.6), 1.9~2.2 (average 2.0) and 1.7~2.1 (average 1.8) mm $day^{-1}$, in the G-1, G-2, G-3 and G-4 stage, respectively. The TWR (Total water requirement) according to growth stage was 18.0~22.1 (average 19.3), 50.6~66.6 (average 56.3), 63.5~88.2 (average 72.4) and 38.3~54.5 (average 44) mm, in the G-1, G-2, G-3 and G-4 stage, respectively.