• 한국관개배수논문집
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• 제14권2호
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• pp.214-224
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• 2007

This study was carried out to investigate of water quality and irrigation water use possibility of reservoirs near Saemangeum for upland and horticultural fields. Water samples were taken at 6 reservoirs for 5 months from June, 2006 to November, 2006. The water temperature, pH, EC, EC, chlorophyll - a of 6 reservoirs were ranged 8.7-$31.2^circC$, 6.9-9.2, 73.0-637.0$\mu$S/cm, 0.9-443.2mg/$m^3$, respectively. The concentration of DO, BOD, COD, T-N, T-P and SS were ranged 5.7-11.7mg/L, 0.5-8.9mg/L, 2.9-18.0mg/L, 0.07-6.52mg/L, 0.002-0.406mg/L, 0.5-54.0mg/L Also, storage ratio and storage capacity of Mije reservoir, Okgu reservoir, Oknyeo reservoir, Neungje reservoir were decreased between June and April, but those of Oksan reservoir was kept high during irrigation period. Water supply of reservoirs was 4,474,100$m^3$(Oksan), 6,165,900$m^3$(Mije), 13,209,900$m^3$(Okgu), 4,675,600$m^3$(Oknyeo), 7,682,000$m^3$(Neungje), 19,231,000$m^3$(Cheongho) in 2006, respectively. It is resevoirs for upland and horticultural fields that use main irrigation water resources before Saemanguem fresh-water lake development, and use assistance irrigation water resources in emergency after Saemanguem fresh-water lake development. In the meantime, for continuous use of reservoir as irrigation water resource for upland and horticultural fields, we must examine about surplus water capacity, and need investigation about supply possibility of irrigation water, condition of irrigation water, water quality.

• 한국농공학회논문집
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• 제51권4호
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• pp.67-73
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• 2009

Chemical properties of soil in the proposed horticultural complexes of Saemangeun reclaimed tideland were studied for sustainable development of the newly reclaimed land resources. The soil texture of Gwanghwal, Gyehwa, Mangyeong and Okgu complex area were sandy loam. The pH and ESP (exchangeable sodium percentage) were 7.42 to 7.82 and 61.05 to 73.62 %, respectively. Compared to general agricultural land in Korea, the soil organic matter and other plant nutrients were low. The concentrations of heavy metals in the soil were found to be acceptable except several sites where they doesn't meet the warning standard of agricultural land contamination. Continuous monitoring and interception of external pollutants are suggested for water-soil-plant system conservation.

• 농업과학연구
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• 제42권4호
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• pp.313-318
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• 2015

In the year 2013, onions cultivation in Jeonnam province suffered by frost-pillar damage. To reveal the aspects of the cause and outbreak, we surveyed those damaged areas. Usually the frost-pillar damage occurred in February. But the outbreak aspect is so unforeseeable. In 2013, the damage was shown as 10.6% in onion fields including paddy fields, but no damage was noticed in 2014. The damage was noticed as 77.8% in paddy fields and 30.1% in upland. And, by the difference of the onion transplanting date, it occurred as 0.7% by the middle of November to the early of November, 22% by the middle of November and 69.0% by the early of December. If one performed the supplementary planting at $3^{rd}$ week of February, the highest survival percent was observed as 53.3%. If the date is early, another frost-pillar damage was occurred. If it's late, the damaged plant was perished with dry. In any case, we found improper transplanting caused the yield decrease. Therefore, we recommend the timely transplanting is the most important way for the prevention of frost-pillar damage in the onion cultivation.

• 환경생물
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• 제42권2호
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• pp.172-175
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• 2024

A poorly known spider, Pholcus kwangkyosanensis Kim & Park, 2009 is redescribed with diagnosis, detailed descriptions, and taxonomic photographs of diagnostic characters. P. kwangkyosanensis is similar in appearance to P. kwanaksanensis Namkung & Kim, 1990, in terms of the shape of the genital organ and body, but it can be easily distinguished from the latter by the shape of the cheliceral apophysis, uncus, and procursus in males, as well as the shape of the epigynum and pore plates in females. The specimens of this spider were collected at the type locality (Mt. Gwanggyosan, Suwon), specifically under the bridge on a local stream in an agricultural landscape surrounded by rice fields, upland fields, or horticultural greenhouses.

• 원예과학기술지
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• 제31권5호
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• pp.652-655
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• 2013

한국에서 야생(잡초)참외의 자생분포지역은 서해의 옹진군으로부터 남으로 보령 서산(태안), 서천, 군산, 부안, 고창, 영광, 무안, 신안, 해남, 진도, 완도, 고흥, 여수, 하동, 남해, 고성, 통영, 거제시 등의 해안 또는 도서 지방과 제주시, 북제주군 및 남제주군이었다. 이들 지역에서 농경지 또는 그 부근에서 현존하고 있음을 확인하였다. 야생참외가 자생하고 있는 장소는 농경지 및 그 부근이었다. 지방별 자생하고 있는 농경지내용은 대두밭에서 가장 많았다. 다음은 녹두밭, 고구마밭, 고추밭, 참깨밭, 목화밭, 땅콩밭 순위의 빈도였다. 조 밭 주변, 개울가의 논두렁, 밭두렁, 수박밭, 옥수수밭, 농가인접의 채소밭, 감귤밭, 퇴비무더기, 폐농지, 도로변 및 기타 농가정원에서도 자생하고 있었다. 대체로 키가 낮은 작물의 경작지이면서 광선공간이 있고 다소 건조한 곳에서 자생이 많았다. 과실의 숙기는 7월 상순에서 10월 하순까지였는데 9월의 응답빈도가 많았다. 과실이 성숙되면 꼭지가 빠지는데 이는 자생에 효율적인 특성으로 추정되었다. 과실의 용도는 장난감과 식용이 많았다. 과실을 사람이나 가축이 먹고 분으로 배설된 것을 밭거름으로 사용하면 거기서 발아되어 결실되고 익은 과실은 추수기에 사람이나 가축이 다시 먹게 되어 세대가 유지되는 것으로 추정되었다.

• 한국토양비료학회지
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• 제30권2호
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• pp.146-151
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• 1997

주요(主要) 채소류(菜蔬類) 재배지 토양의 화학적 특성을 밝히고, 화학성분 함량의 변동양상(變動樣相)을 파악하여 토양개량(土壤改良) 및 시비량(施肥量) 기준설정(基準設定)의 기초자료(基礎資料)로 활용(活用)하고자 고추, 마늘, 양파, 수박, 무, 배추, 감자 등의 주산단지(主産團地)에서 작물별로 30개 포장(圃場)(합계(合計) 210개 포장(圃場))을 선정(選定)하여 토양화학성을 조사(調査)한 결과(結果)는 다음과 같다. 1. 노지채소(露地菜蔬) 재배지 토양의 양분함량은 대체적(大體的)으로 채소류 재배에 적합(適合)하나 성분별(成分別)로 구분(區分)하여 보면 pH와 유기물(有機物), 고토(苦土)등은 밭토양 개량목표에 미달(未達)되고 있으나 인산과 가리는 개량목표를 상회(上廻)하였다. 2. 채소류 재배지 토양의 양분함량(養分含量)을 작물별로 구분(區分)하여 보면 마늘>감자>배추>양파>고추>무>수박 재배지 순(順)으로 높았다. 3. 채소류 재배지 토양의 미량원소(微量元素) 함량(含量)은 Fe 71~89, Mn 38~40, Cu 1.4~1.6, Zn 2.2~3.0 mg/kg 범위(範圍) 이었다. 4. 밭토양의 화학성분 분포비율(分布比率)을 보면 pH는 5.0 이하가 41%인 반면(反面) 유효인산과 치환성 칼리 및 석회는 각각(各各) 73, 47, 63%가 밭토양 개량목표(改良目標)를 상회(上廻)하고 있다.

• 한국토양비료학회지
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• 제49권2호
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• pp.208-217
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• 2016

The Rural Development Administration moved to Jeonju for the balanced development of the land. This situation required establishment of new research fields with soils appropriate to cultivation. We applied a variety of amelioration techniques to mature soils of new research fields of the National Institute of Agricultural Science (NAS) and evaluated effects of the integrated amelioration techniques. The schedule of amelioration was following: 1) location of research fields was determined, 2) surface and subsoil samples were collected separately, 3) after aligning the top level of research fields, subsoil and surface soil were re-established with soil amendment, 4) the green manure crops were grown four seasons to improve the uniformity and increase the organic content of the research field, and 5) drainage canal and/or underdrainage were applied to poorly drained fields. The last green manure crop was rape in RDA fields and green barley in NAS fields. The average height, fresh weight, and dry matter weight of rape in good condition were 123 cm, $3,938kg\;10a^{-1}$, and $651kg\;10a^{-1}$, respectively. The height, fresh weight, and dry matter of green barley, on average, were 97 cm, $3,013kg\;10a^{-1}$, and $1,004kg\;10a^{-1}$, respectively. In the chemical properties of paddy field, pH and levels of silicate, calcium, magnesium, and potassium were in appropriate range but organic matter content of $16g\;kg^{-1}$ was less than the optimum level. In the chemical properties of upland field, pH and levels of phosphorus, calcium, magnesium, and potassium were appropriate range but organic matter content of $12g\;kg^{-1}$ was less than the optimum range. Evaluation of well-adapted soil was performed. The field in RDA was classified into the superior class with points ranging from 90 to 95 by the field evaluation test. The fields in NAS were mainly evaluated as the superior class with points greater than 85. However, some fields in NAS remained low quality with scores between 80 and 83. Further soil amelioration practices were suggested to fields with low soil quality.

• 원예과학기술지
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• 제19권4호
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• pp.465-470
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• 2001

토양 중 Se 함량은 논보다 밭토양에서 높았으며 지역 간 차이가 있었다. Se 함량은 Se 처리농고가 높을수록 증가였으며, 엽초보다 인경에서 많았다. 마늘에 시용한 Sodium selenate는 sodium selenite보다 Se 흡수를 많이 시켰다. Se 처리에 따른 마늘 생육은 무처리와 차이가 없었다. Sodium selenate의 엽면시용은 농도가 높아질수록 인경에서 Se 함량이 높았으나, 토양처리는 농도에 따른 차이가 뚜렷하지 않아서 엽면시용이 효율적인 것으로 보인다. 무처리구의 Se 함량은 논토양에 비하여 강우가 차단된 하우스의 인공용토에 재배한 마늘에서 높았다. 무기성분에서 인이나 유황은 인경에 많으며, 유황, 마그네슘 및 칼륨은 Se 처리구에서 무처리보다 약간 높게 나타났으나 처리농도에 따른 일정한 경향은 없었다.

• 원예과학기술지
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• 제31권1호
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• pp.24-31
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• 2013

This study was conducted to determine the characteristics of quality and yield in potatoes grown at paddy field before rice transplantation during the spring season. Three potato cultivars ('Jowon', 'Haryeong', and 'Goun') were grown in Gangneung (asl 5 m) and Seocheon (asl 20 m). In both locations, weather condition belonged to the fourth zone (spring cropping) in potato production location's distribution of Korea. Daily mean soil temperature in both the locations was $0.2-0.6^{\circ}C$ lower than air temperature, while soil moisture was adequate level to potato growth in spite of spring drought. TR ratio was not affected by location, but by cultivar. Specific gravity, starch content, dry matter rate, and yield were significantly influenced by location and by cultivar. There was no difference in total tuber number by location, however there was a large gap in marketable tuber yield according to locations and cultivars. There were high negative relationships between yield and main qualities such as dry matter rate and starch content, while high positive correlation was observed between main qualities. It was possible to produce potato before rice transplanting at drained paddy fields located in representative two locations of potato spring cropping and their characteristics in growth and quality were similar to those generally well known in upland cultivation. Paddy field was thought to be more favorable than upland in terms of available soil moisture supply against spring drought. Further research, however, was needed to increase soil temperature and also preliminary review on proper cultivar according to location seemed to be needed for high yield.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.315-315
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• 2017

In Japan, more than 80 % of soybean growing area is converted fields and excess water is one of the major problems in soybean production. For example, recent study (Yoshifuji et al., 2016) suggested that in the fields of shallow groundwater level (GWL) (< 1m depth), rising GWL even in a short period (e.g. 1 day) causes inhibition of soybean growth. Thus it becomes more and more important to predict GWL and soil moisture in detail. In addition to conventional surface drainage and underdrain, FOEAS (Farm Oriented Enhancing Aquatic System), which is expected to control GWL in fields adequately, has been developed recently. In this study we attempted to predict GWL and soil moisture condition at the converted field with FOEAS in Biwa lake reclamation area, Shiga prefecture, near the center of the main island of Japan. Two dimensional HYDRUS model (Simuinek et al., 1999) based on common Richards' equation, was used for the calculation of soil water movement. The calculation domain was considered to be 10 and 5 meter in horizontal and vertical direction, respectively, with two layers, i.e. 20cm-thick of plowed layer and underlying subsoil layer. The center of main underdrain (10 cm in diameter) was assumed to be 5 meter from the both ends of the domain and 10-60cm depth from the surface in accordance with the field experiment. The hydraulic parameters of the soil was estimated with the digital soil map in "Soil information web viewer" and Agricultural soil-profile physical properties database, Japan (SolphyJ) (Kato and Nishimura, 2016). Hourly rainfall depth and daily potential evapo-transpiration rate data were given as the upper boundary condition (B.C.). For the bottom B.C., constant upward flux, which meant the inflow flux to the field from outside, was given. Seepage face condition was employed for the surrounding of the underdrain. Initial condition was employed as GWL=60cm. Then we compared the simulated and observed results of volumetric water content at depth of 15cm and GWL. While the model described the variation of GWL well, it tended to overestimate the soil moisture through the growing period. Judging from the field condition, and observed data of soil moisture and GWL, consideration of soil structure (e.g. cracks and clods) in determination of soil hydraulic parameters at the plowed layer may improve the simulation results of soil moisture.