• KOREAN JOURNAL OF CROP SCIENCE
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• v.54 no.4
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• pp.390-396
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• 2009

To select optimal shade material in paddy soil, growth characteristics and ginsenoside contents were investigated in new cultivar, 'Cheonpoong' of three-year-old ginseng cultured under three kinds of shade materials such as three-layered blue and one-layered black PE (polyethylene) net (TBPN), blue PE sheet (BPSS), and aluminium-coated PE sheet (APSS). The order of light transmission ratio and air temperature by shade materials were BPSS > APSS > TBSB among three shade materials. Average soil water tension in PDC and IDC was 64 mbar (absolute soil moisture, 25%) and 123 mbar (absolute soil moisture, 17%), respectively, and soil water tension in IDC was changed more distinctly than that of PDC by season and shade materials. Yield in PDC was distinctly decreased more than that in IDC because of the increase of discolored-leaf and rusted-root ratio. BPSS and TBPN among three shade materials were the most effective on the increase of yield in PDC and IDC, respectively. Ratio of rusty-colored root showed not significant difference by drainage class and shade materials. Contents of panaxatriol ginsenoside (Rg1, Re and Rf) were decreased in PDC, while it of panaxadiol ginsenoside (Rb1, Rc and Rd) were increased in IDC. Total ginsenoside contents of IDC was distinctly higher than that of PDC, and BPSS showed the highest contents among three shade materials regardless of poorly and imperfectly drainage class.

• Korean Journal of Weed Science
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• v.31 no.1
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• pp.41-48
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• 2011

This survey of weed population by different soil moisture with paddy-upland rotation was conducted to investigate information on weed flora and its ecology between two years. Weed species were assessed in April : 2009, 2010. Soil samples were taken from each study plot to assess the impact soil moisture on the occurrence and abundance of dominance weed species. Soil water of poorly drained field ranged from 10.2~18.2% more than 11.8~14.3% of somewhat poorly drained field. Weeds of fields composed of 19 species belonging to 12 families. Among 12 families, 6 weed species belonged to Compositae (31.6%) were the biggest family, Cruciferae were 2 species (10.5%), and Rubiaceae were 2 species (10.5%), respectively. Youngia japonica had the highest summed dominance ratio(SDR) (97.0%) and followed by Conyza canadensis (92.1%), Galium spurium (35.3%) and Hemistepta lyrata (28.4%) of somewhat poorly drainage in 2009. Artemisia princeps the highest SDR (100%) and followed by Stellaria alsine(55.2%), Y. japonica (38.3%) and Nasturtium officinale (28.5%) of poorly drainage in 2009. And, Stellaria alsine had the highest SDR (86.8%) and followed by Alopecurus aequalis (77.7%), Astragalus sinicus (68.7%) and Y. japonica (46.3%) of somewhat poorly drainage in 2010. S. alsine the highest SDR (93.7%) and followed by A. aequalis (78.6%), Nasturtium officinale (31.3%) and Y. japonica (30.4%) of poorly drainage in 2010. Simpson's index was calculated to 0.12~0.23, which showed that weed occurrence with different soil moisture in paddy-upland rotation and between years was various. Similarity coefficient between years was 43.0% (2009) and 74.2% (2010), which indicate a low diversity because of the moisture in the agro-ecosystem.

• Korean Journal of Medicinal Crop Science
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• v.15 no.1
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• pp.12-16
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• 2007

This study was carried out to investigate the cultivated soil properties, the growth and yield of Ostericum koreanum Kit. in the Bonghwa area. The results were as follows: In Bonghwa area, soil texture of upland soil were mostly sandy loam and loam. Sloped areas of $7\sim15%$ were plentiful than the other slopes, that of next was $15\sim30%$ slope. Sandy loam and loam soil were mostly 'well' in the drainage class, but loamy coarse sand and loamy sand soil were 'excessively well' drainage class. In the 'moderately well' drainage class, yield of Ostericum koreanum was 289kg/10a, and that of 'poorly' drainage class was low. The yield of loam soil texture was 284kg/10a. Soil organic matter, Potassium and EC were lower in 'poorly' drainage, but the other constituents were not definite tendency by different drainage classes.

• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.412-412
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• 2023

정부는 2027년까지 식량자급률 55.4%를 달성하고, 채소·과실류 국내 공급 여력의 85% 수준을 유지하기 위한 적정 농지면적 150.0만ha가 필요하다고 추정하였다. 그리고 정부는 적정 면적 확보를 위해서 농지보전 목표가 포함된 중장기 기본계획을 수립할 예정이다. 이러한 식량자급률 달성과 채소 및 과실류 재배 면적 확보를 위해서는 논의 다각적인 활용 방안을 모색할 필요가 있다. 왜냐하면 최근 쌀 공급과잉 문제를 해결하기 위해 최근 '양곡관리법'이 정치적 이슈로 등장할 만큼 쌀 공급과잉 해소와 논 농지의 효율적인 활용에 대해 사회적 관심이 많다. 이러한 맥락에서 본 연구에서는 우리나라 최초로 논 배수 개선을 위해 지하암거가 설치된 경북상주시 공검면 일대를 대상으로 암거배수의 성과를 살펴보고 개선방안을 모색하였다. 이를 위해 본 연구에서는 지하암거 설치로 배수여건이 개선된 수혜농가 42명을 대상으로 심층면담을 실시하였다. 사례지역은 오태저수지를 기점으로 시작하는 공검소하천 양안에 넓게 위치하고 분지지형으로 하천보다 낮은 저지대로, 평상시·강수시 지하수위가 높아 습답이 형성되어 영농기계 사용이 어렵고, 일부지역의 경우 작물 파종, 수확을 하지 못하는 등 피해 발생하여 영농여건이 매우 불리한 지역이다. 이러한 배수불량을 개선하기 위해 수혜면적 55.6ha에 (지하)배수가 정비되었다. 이러한 배수 개선이 지역 영농에 미치는 효과는 다음과 같이 분석되었다. 첫째, 수혜구역 내 농가들은 배수불량으로 농기계 작업이 불편하고, 논의 습답을 제거하기 위해 해당 시설에 대한 필요성을 느끼고 있다. 또한 암거배수 시설로 인해 약 72% 농가들은 습답 개선의 효과가 있는 것으로 나타났다. 둘째, 전체 수혜농가의 약 72%는 암거시설로 인해 논의 습답이 개선된 것으로 나타났다. 특히, 암거시설로 인해 물빠짐이 개선되었고, 농기계 작업이 용이하게 되었다. 다만 사업 첫해에는 논을 파헤쳐 농기계가 빠지는 피해가 있었지만, 2차년도부터는 논이 정비되어 농기계 빠지는 피해는 없는 것으로 분석되었다. 셋째, 수혜 농가들이 느끼는 "습답 피해가 매우 있음"은 사업 시행 전 51.61%에서 사업 완료 후에는 4.17%로 급격히 감소하였다. 또한 "습답 피해가 전혀 없음"을 느끼는 농가는 사업 시행 전 3.23%에 불과했지만, 사업 완료 후에는 20.83%로 급증하였다.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.59 no.3
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• pp.282-292
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• 2014

This study investigated the changes of antioxidant compounds and antioxidant activity of foxtail millet (FM) and proso millet (PM) by drainage methods in poorly drained sloping paddy field. The experimented soils in this study were very poorly drained (VPDP) and imperfectly drained paddy soil (IDP). Two drainage methods namely under pipe drainage (UPD) and open ditch (ODD) were installed within 1-m position at the lower edge of the upper paddy fields. The soil moisture contents of UPD and ODD on VPDP were $18.52{\pm}4.58$ and $19.01{\pm}4.25%$, and IDP were $14.87{\pm}4.82$ and $18.64{\pm}3.85%$, respectively. Generally, crop yields, proximate and minerals composition of FM and PM showed significant differences by drainage methods. The total polyphenol, flavonoid and tannin contents, and radical scavenging activity of the ethanolic extracts of FM and PM showed significant differences by drainage methods. The total polyphenol content of FM and PM by drainage methods was 1.69~2.30 and 1.18~1.35 mg GAE/g, total flavonoid content was 0.31~0.76 and 0.27~0.41 mg CE/g, and total tannin content was 0.36~0.54 and 0.21~0.28 mg TAE/g, respectively. The DPPH radical scavenging activity of FM and PM was 39.53~59.81 and 27.91~40.25 mg TE/100 g, and ABTS radical scavenging activity was 113.59~152.10 and 61.38~79.19 mg TE/100 g, respectively. The antioxidant compounds and radical scavenging activity of FM and PM by drainage methods were frequently affected soil water.

• Journal of The Korean Society of Grassland and Forage Science
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• v.31 no.2
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• pp.119-126
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• 2011

This experiment was carried out to know adaptability and forage production and quality of sorghum, sorghum ${\times}$ sudangrass and sudangrass hybrids depend on drained condition at paddy field from 2007 to 2008 at Chungnam province. Growth, forage production and quality of sorghum, sorghum ${\times}$ sudangrass and sudangrass hybrids showed more well drained condition than poorly drained condition at paddy field. Among growth characteristics, 'SS405' hybrids were somewhat strong for waterlogging, then and good at stem diameter, disease resistance. The dry yield of 'SS405' hybrid at poorly drained paddy field was the highest as 12,938 kg per ha. Fresh yield of poorly drained paddy field was 52.7% compared to that of well drained paddy field. The dry matter yield of poorly drained paddy field was the lower as 66.4% than that of well drained condition. ADF (acid detergent fiber), NDF (neutral detergent fiber), CP (crude protein) and IVDMD (in vitro dry matter digestibility) in poorly drained paddy field were 90.3%, 100.6%, 85.7% and 89.6% level compared to well drained paddy field.

• Korean Journal of Soil Science and Fertilizer
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• v.24 no.1
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• pp.55-60
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• 1991

This study was carried out to obtain the effects of soil environment and characteristics on the growth and yield of young rice seedling. Twenty four rice fields were selected among the labor saving mechanization complex, and the growth statu s and various soil characteristics were investigated The young rice seedling planted soils were located at the range of elevation 5m to 210m, and the average water holding days was 5.1 days, and drainage class were mainly moderately well to imperfectly. The plant height on 30th day after machine transplanting were higher and the tiller numbers were smaller at the higher clay contents at moderately well and imperfectly drained soils. In case of sandy loam soils, the better the drainage class, the higher plant and more tillers. Soil hardness was lower in sandy loam, and the bulk densities of loam, silty clay loam and poorly drained soils were lower than the other fields. There were not differences of soil chemical properties between the soil textural groups but organic matter content were higher in poorly drained soils. The rice yields of young seedling planted fields were negatively correlated to soil bulk density and highly significantly correlated to the exchangeable calcium contents of the soils. The average yield of young rice seedlings was 487kg/10a, 2.5% higher than semi-adult rice seedling of 475kg/10a.

• 농업기술회보
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• v.51 no.4
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• pp.28-29
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• 2014

장마철 집중호우로 인해 배수불량 지대에서 작물이 장기간 침수되면 뿌리활력 저하로 인한 습해와 토양전염성병, 탄저병, 점무늬병 등 지상부 병해가 나타나다. 이번달에는 고품질 약용작물을 생산하기 위해 장마철 전 후 약용작물의 병해충 방제방법에 대해 알아본다.

• Proceedings of the KGS Conference
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• 2003.11a
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• pp.8-12
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• 2003

범람원은 홍수시 하천의 유량이 급격하게 증가해서 하천의 운반물질인 부유 하중이 하도를 넘어 하천 양안에 범람하여 퇴적되면서 형성된 지형으로, 유량이 많고 하곡이 넓은 지역에서 잘 발달한다. 범람원 중 자연제방은 지면이 높아 홍수의 피해가 적고, 배수가 잘 되기 때문에 취락의 입지나 농경에 유리하고, 배후습지는 지하수위가 높아 배수가 불량한 지형으로 오늘날에는 농경지로 개간하여 활용하고 있다. (중략)

• Proceedings of the Korean Institute of Landscape Architecture Conference
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• 2015.11a
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• pp.119-120
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• 2015