• 제목/요약/키워드: reclaimed rice field

검색결과 83건 처리시간 0.031초

Feasibility Study of Agronomic Application of Treated Sewage for Paddy Rice Culture

  • Woo, Sun-Ho;Yoon, Chun-Gyeong
    • 한국환경농학회지
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    • 제19권5호
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    • pp.433-441
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    • 2000
  • A feasibility study was performed to examine the agronomic application of treated sewage on paddy rice culture by field experiment for two consecutive years. The domestic sewage was treated by the constructed wetland system which was in subsurface flow type and consisted of sand and macrophyte. The effluent of the wetland system was used for irrigation water. The effluent was diluted to maintain the total nitrogen concentration below $26mg{\cdot}L^{-1}$ in the first year and used without dilution in the second year experiment. Growth components and yields were compared against the CONTROL plot where conventional method was applied. And also, soil characteristics of the plots before and after reclaimed sewage irrigation were analyzed. Generally, addition of the treated sewage to the irrigation water showed no adverse effects on paddy rice culture, and even enhancement was noticed in both growth and yield. Irrigation of treated sewage after concentration adjusted with conventional fertilization showed the better result, and the yield exceeded that of CONTROL case where clean water was irrigated. Soil characteristics changed after irrigation, and significant EC increasing was observed for the reclaimed sewage irrigation plots. From this study, it appears that reuse of treated sewage, as supplemental irrigation water could be a feasible and practical alternative. For full-scale application, further study is recommended on the specific guideline of major water quality components in treated sewage for irrigation and public health.

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Performance evaluation of a subsurface drainage culvert system in converted paddy fields

  • Do, Jong Won;Park, Jongseok;Kim, Hyuntai;Lee, Kwangya;Shin, Hyungjin
    • 농업과학연구
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    • 제47권2호
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    • pp.263-273
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    • 2020
  • With the change of the agricultural environment (increased rice production, decreased rice consumption, and rice production policies), converting paddy fields into upland fields is an increasing trend. In terms of conversion into upland fields, subsurface drainage is one of the most important factors for good field crop growth. This study evaluates the performance of a subsurface drainage culvert system in paddy fields and reclaimed lands. The obtained results are briefly summarized as follows: 1) After a comparative evaluation of several subsurface drainage culvert systems, including excavated subsurface drainage and non-excavated subsurface drainage types, type 3 (non-excavated, perforated drain pipe 50 mm, filter mat B50 cm, subsoiling 70 cm and culvert spacing 5 m) shows relatively high values among four types in terms of effectiveness (subsurface discharge capability) and economic efficiency (construction cost). 2) Type 3 has proven that it is suitable for design standards of discharge capacity through field tests performed in paddy fields (three sites: Gong-geom, Gae-san, Juk-san) and reclaimed lands (two sites: Gum-ho, Mi-am). 3) In the experiment of Sesamum indicum growth according to the existence of a drainage system, Sesamum indicum growth with a subsurface drainage culvert system had good value in terms of plant shoot and root length, shoot fresh and dry weight, and root fresh and dry weight).

신간척지에서 염해경감 및 등숙률 향상을 위한 완전낙수시기 구명 (Establishment of Perfect-Drainage Period for Reduction of Salt Injury and Improvement of Grain Filling Ratio in the Newly Reclaimed Land)

  • 최원영;양창휴;이장희;김택겸;정재혁;최민규;김시주
    • 한국작물학회지
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    • 제56권2호
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    • pp.177-181
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    • 2011
  • 본 연구는 신간척지에서 적정 완전낙수시기를 구명함으로써 안정적인 수량확보 및 미질향상을 하기 위하여 완전낙수시기를 출수 후 25일부터 50일까지 5일 간격으로 처리하여 신간척지인 새만금 계화포장에서 수행한 내용을 요약하면 다음과 같다. 1. 2010년 출수 후 적산온도는 평년대비 수확기를 기준으로 $100^{\circ}C$ 정도 높았고 강수량은 약간 적었다. 2. 평균 주당수수는 16.5개 이었고, 수당입수는 88개 이었다. 3. 출수 후 40~50일 낙수처리가 출수 후 25~35 일 낙수처리보다 등숙비율은 3% 정도 높았고 현미천립중은 0.6 g정도 무거웠다. 4. 쌀수량은 출수 후 25일 낙수 대비 30~35 일 낙수에서는 유의차가 없었고, 40~50일 낙수에서는 7~8% 증수하였다. 5. 완전립비율은 출수 후 35 일 낙수에서 높았고, 단백질 함량은 조기 낙수할수록 낮았다. 6. 토양수분과 토양경도는 고도의 부의상관이 있었고, 완전낙수후 시간이 경과할수록 토양중 EC는 높아졌다. 이상의 결과로 볼 때, 신간척지에서 안정적인 쌀 수량 확보를 위한 적정 완전낙수시기는 출수 후 40~50 일이라고 판단된다.

간척답 벼 직파재배에 관한 연구 (Studies on the Direct Sowing Culture of Rice in Reclaimed Paddy Field)

  • 이석수;심재성
    • 자연과학논문집
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    • 제5권2호
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    • pp.49-62
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    • 1992
  • 본 연구는 신간척답에서 담수직파, 항공직파, 건답직파, 어린모이앙, 중묘이앙재배에 따른 발아, 생육 및 수량변화와 과산화석회 종자분의 적량을 토양종류, 유기물시용 및 파종심도등을 토양조건별로 구명하여 직파재배의 실용화를 검토한 것으로 얻어진 결과를 요약하면 다음과 같다.1. 간척답에서 파종 20일후 (5월 6일 파종) 의 재배양식별 출현율은 담수 직파에서 73%, 항공직파에서 70%, 및 건답직파는 62%였다.2. 성숙기의 도복정도는 담수직파와 항공직파에서 5, 건답직파는 3, 어린모이앙 및 중묘이앙에서는 2의 도복 정도를 나타내었다. 3. 최고분벽경수는 담수직파에서 568개, 건답직파에서 527개였다. 또한 출수기는 중묘이앙에 비하여 담수직파가 4일, 건답직파가 8일, 어린모이앙이 2일 지연되었다. 4. 수량은 담수직파가 항공직파 보다 1%, 그리고 건답직파보다는 3% 증가를 보였으나, 어린모이앙에 비해서는 12%의 감소를 나타냈다. 5. 유묘기의 전건물중은 고염도로 갈수록 감소율이 높았다. 그리고 토양염농도 0.3%에서는 어린모이앙구가 57%. 담수직파구에서 60% 및 건답직번구에서 63%의 감소율을 나타냈다. 6. 과산화석회 분의량 1g의 10일간 산소발생량 담수초기 2~3일에 순수, 염수에서 1.0cc의 급격한 발생을 보이다 4일부터 평균 약 0.6cc로 낮아졌고 산소 발생량은 순수에서 6.0cc 0.3과 0.6%의 염수에서 6.4cc의 다소 많은 량이 방출되었다. 7. 간척답 토양에서는 파종당시 염농도 0.4% 이하의 조건에서 1cm 깊이 파종은 과산화석회 종자량의 우량 2cm 깊이 파종은 동량이 적당하고 유기물을 사용할 경우에는 1cm 깊이 파종만 하되 적정분의량은 종자량과 동량 처리하는 것이 출아에 효과적이었다. 8. 간척답에서 과산화석회 종자 분의 처리후 기계직파한 구에서 도복이 7로 인력산파 9보다 도복 경감이 되었다. 9. 간척답에서 종자를 과산화석회 분의하여 기계직파할 때 유기물을 사용한 처리가 무사용보다 5%의 수량 증수 효과를 보였다.

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계화 간척지구 강우 유출수의 비점오염원 유출특성에 관한 연구 (Characteristics of Nonpoint Source Pollution from a Reclaimed Rice Paddy Field)

  • 여미미;이제도;우강화;김영철
    • 한국습지학회지
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    • 제11권3호
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    • pp.9-19
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    • 2009
  • 본 연구에서는 계화간척농지로부터 발생 되는 비점원 오염물질 유출현황을 조사하였다. 간척 논면적은 2,988ha로 크게 1,181ha와 1,817ha 크기의 두개의 소유역으로 구성되어 있다. 두개의 소유역에 대해 각각 3번의 강우사상에 대해 조사가 이루어졌으며 강우량은 각각 66.0, 23.5, 23mm이었다. 간척농지에서 오염물질 유출 특성은 일반 내륙의 논에서와 다른 양상을 나타내었다. 일반적으로 우리나라 논에서는 발생되는 비점오염부하는 큰 반면에 연구대상 간척농지에서 발생되는 TSS, TN, TP의 비점오염 유출수준은 일반 임야지역 수준으로 나타났다. 다른 유역과 다르게 질소의 경우 용존성 유기질소가 주종을 이루고 있으며 인의 경우에는 용존성 인이 주종을 이루고 있었다.

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한국의 국가관리 간척지 토양의 화학성 변동: 4년 모니터링 결과 (Soil Chemical Properties of Reclaimed Tide Lands Under Government Management in Korea: Results of 4-years monitoring)

  • 류진희;이수환;오양열;이정태
    • 한국환경농학회지
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    • 제38권4호
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    • pp.273-280
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    • 2019
  • BACKGROUND: The reclaimed lands for agricultural use managed by the Korean government is consisted of 17,145 hectares of lands under construction and 13,384 hectares of completed lands. In order to utilize these reclaimed lands as competitive agricultural complexes, the government is preparing to develop comprehensive development plans for multiple purposes. For rational land-use planning and soil management, information of the soil chemical properties is necessary. METHODS AND RESULTS: From 2013 to 2016, soil samples were collected from 85 representative sampling sites of the reclaimed lands and analyzed for soil chemical properties including electric conductivity (EC), pH, soil organic matter (SOM), and nutrients. The annual mean soil EC ranged from 5.1 to 8.3 dS m-1 and have continued to decrease over the years (estimation equation with EC as dependent and year as independent variable was y =0.0736x2 - 1.4985x + 9.8305, R2 = 0.9753). The pH ranged from 7.3 to 7.6, which was higher than the optimum range (5.5~7.0) for agricultural soils. Soil organic matter (8 to 11 g kg-1) was lower level than the optimum range (20~30 kg-1). Available silicate (Av.SiO2) ranged from 169 to 229 mg kg-1, which was close to the minimum content (≥157 mg kg-1) for rice paddy field. Available phosphate (Av.P2O5) content (24~39 mg kg-1) was lower than the optimum range (80~120 mg kg-1) for rice paddy field. CONCLUSION: For efficient agricultural use of reclaimed lands under government management, our results suggest that the application of organic matter and supplying deficient nutrients as well as desalinization is required.

Effect of Capillary Barrier on Soil Salinity and Corn Growth at Saemangeum Reclaimed Tidal Land

  • Lee, Sanghun;Lee, Su-Hwan;Bae, Hui-Su;Lee, Jang-Hee;Oh, Yang-Yul;Noh, Tae-Hwan;Lee, Geon-Hwi
    • 한국토양비료학회지
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    • 제47권6호
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    • pp.398-405
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    • 2014
  • Salt accumulation at soil surface is one of the most detrimental factors for crop production in reclaimed tidal land. This study was conducted to investigate the effect of capillary barriers beneath the soil surface on dynamics of soil salts at coarse-textured reclaimed tidal land. A field experiment was conducted at Saemangeum reclaimed tidal land for two years (2012-2013). Capillary barriers ($3.5{\times}12m$) were treated with crushed-stone, oyster shell waste, coal briquette ash, coal bottom ash, rice hull and woodchip at 40-60 cm depth from soil surface. Silage corn (Zea mays) was cultivated during the experimental period and soil salinity was monitored periodically. Soil salinity was significantly reduced with capillary barrier compared to that of control. Oyster shell waste was one of the most effective capillary barrier materials to control soil salinity at Saemangeum reclaimed tidal land. At the first growing season capillary barrier did not influence on corn growth regardless of types of the material, but plant biomass and withering rate of corn were significantly improved with capillary barrier at the second growing season. The results of this study showed that capillary barrier was effective on the control of soil salinity and improvement of corn growth, which indicated that capillary barrier treatment can be considered one of the best management practices for stable crop production at Saemangeum reclaimed tidal land.

간척지 논의 부산석고비료 시용효과 (Effects of Phospho-gypsum Fertilizer as Reclamation Material in the Newly Reclaimed Paddy Fields)

  • 손보균;이도진;박범기;채광식
    • 한국토양비료학회지
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    • 제40권2호
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    • pp.145-150
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    • 2007
  • 간척지 논에 대한 부산석고비료 처리 효과 구명을 위하여 고흥과 영암 지역의 간척지 시범포를 대상으로 부산석고비료를 처리하여 벼의 수량, 생육 및 벼의 성분함량과 간척지 논의 토양특성에 대해 조사하였다. 출수기의 벼 초장과 주당경수는 고흥지역의 경우는 차이를 보이지 않았으나 영암지역은 초장이 111.9 cm로 무처리구보다 6.7 cm 길어 고도로 유의한 차이를 보였다. 주당경수는 처리구가 9.1개, 무처리구가 8.0개로 석고처리구가 1.1개 높게 나타났다. 부산 석고처리 유무별 벼 수량 및 성분함량은 조사지역 두 곳 모두 무처리구에 비해 처리구가 좋게 나타났다. 수량지수는 석고 처리구가 무처리구에 비해 고흥지역이 5%, 영암지역이 13% 증수되었다. 수수는 고흥지역의 무처리구가 400개 $m^{-2}$로 처리구 보다 많지만 등숙률이 처리구에서는 81%, 무처리구는 68%로 처리구에서 높게 나타났다. 미질의 성분인 단백질, 아밀로오스 및 지방산의 함량은 부산석고비료 처리구가 무처리구에 비해 높게 나타났다. 토양의 화학적 특성은 두 지역 모두 pH, EC, Av-S, Ca가 무처리구에 비해 부산석고비료 처리구에서 높게 나타났으며, 반면, 토양 중 치환성 Na는 부산석고비료 처리구가 무처리구에 비해 고흥지역 18%, 영암지역 28%로 낮아짐을 보였고, 부산석고비료를 처리함으로서 ESP와 SAR이 낮아졌다. 식물체 분석 결과 석고처리구에서 CaO > MgO > K2O의 순서로 흡수가 많아졌다.

Changes of Soil Properties with Various Soil Amendments in Saemangeum Reclaimed Tidal Saline Soil

  • Lee, Sanghun;Kim, Hong-Kyu;Hwang, Seon-Woong;Lee, Kyeong-Bo
    • 한국토양비료학회지
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    • 제46권4호
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    • pp.281-287
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    • 2013
  • Due to its high salt content and poor physical properties in reclaimed tidal lands, it is important to ameliorate soil physical properties to improve the efficiency of desalination. The objective of this study was to evaluate the changes of soil properties at Saemangeum reclaimed tidal saline soil with various soil amendments. Field experiment was conducted at Saemangeum reclaimed tidal land in Korea and the dominant soil series was Munpo series (coarse loamy, mixed, nonacid, Mesic, Typic, Fluvaquents). Woodchips, crushed-stone, oyster shell, coal bottom ash, and rice hull were added as soil amendments and mixed into surface soil to improve soil physical properties. There was large variability in soil hardness, but oyster shell treatment was significantly lower soil hardness at surface layer. Soil hardness was not significantly different below 15 cm depth. Infiltration rate was also significantly greater at oyster shell treatment. This may be due to the leaching of Ca ions from oyster shell and improved soil properties. However, there was no statistical significant difference of the soil bulk density, moisture content, and porosity. Improved physical properties increased desalinization rate in soil and retarded the resalinization rate when evapotranspiration rate was high. Although soil salinity was significantly decreased with oyster shell amendment, soil pH was increased that should be made up as a soil amendment. Our results indicated that oyster shell application increased infiltration rate and improved soil hardness, and thus oyster shell could be used to improve soil salinity level at Saemangeum reclaimed tidal saline soil.