• 한국농공학회지
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• 제43권4호
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• pp.37-49
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• 2001

This study was performed in order to produce the basic data for developing prediction techniques of desalinization to be applicable to reclaimed tidal lands at the beginning stage. the desalinization experiments were carried out by two water management practices, namely, the leaching method by subsurface drainage and the rinsing method by surface drainage. The 5 soil samples used in this study were collected in 4 tidal land reclamation projects. Regression equations were obtained in order to investigate the changes of electrical conductivity during the desalinization of reclaimed tidal lands and to estimate water requirements for desalinization. The results obtained from this study were summarized as follows: 1. According to USDA Salinity Laboratory classification system of salt affected soils the reclaimed tidal land soils used in this study were saline-sodic soils with the high electrical conductivity and the high exchangeable sodium percentage. 2. With the increase of the water requirements for desalinization the electrical conductivity was decreased with high degree of correlationships and the desalinization effects were remakable in both the leaching method and the rinsing method. 3. In case of the leaching method the electrical conductivity had been reduced below the classification value of salt affected soils when the depth o water leached per unit depth of soil (Dwl/Ds) was 0.3 and the desalinization effects showed a tendency to be much the same in each treatment.

• 한국토양비료학회지
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• 제48권5호
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• pp.326-331
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• 2015

High salinity and sodicity of soils play a negative role in producing crops in reclaimed tidal lands. To evaluate the effects of soil ameliorants on salt removal in a highly saline and sodic soil of reclaimed tidal land, we conducted a column experiment with treating gypsum, compost, and phosphate at 0-2 cm depth and measured the salt concentration of leachate and soil. Electrical conductivity of leachate was $45-48dSm^{-1}$ at 1 pore volume (PV) of water and decreased to less than $3dSm^{-1}$ at 3 PV of water. Gypsum significantly decreased SAR (sodium adsorption ratio) of leachate below 3 at 3 PV of water and soil ESP (exchangeable sodium percentage) below 3% for the whole profile of soil column. Compost significantly decreased ESP of soil at 0-5 cm depth to 5% compared with the control (20%). However, compost affected little the composition of cations below a depth of 5 cm and in leachate compared with control treatment. It was concluded that gypsum was effective in ameliorating reclaimed tidal lands at and below a soil layer receiving gypsum while compost worked only at a soil layer where compost was treated.

• 미생물학회지
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• 제6권4호
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• pp.131-140
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• 1968

The soil of the reclaimed tidal land, located in Chogi-ri, Is. Kanghwa, Korea was used in this experiment. The experimented soil samples were collected from 18 sites with its time elapsed after the shore-protection works, soil-depth and the vegetation of saline plants, and at each site samplings were conducted monthly from March through October, 1968, for the purposes of examining the changes of microbial populations for the microbes such as bacteria, actinomycetes and fungi, by using the dilution plate method. The numbers of the microbes in these soils generally showed lower levels comparing with those of other soils. The more time elapsed after the reclamation, the higher numbers of the microbes inhibited the soils. Higher populations were there in the surface soils than in the lower part of the area. The surface soils included comparatively better conditions in aeration and contents of organic matter than in the lower part, and this fact was. same as in general soils. However, not so was this in the case of March, April and October due to the higher soil temperatures in the lows. At the experimental sites where the halophytes such as Salicorniu were grown vigourously, the more densly the plants grew, the higher populations of actinomycetes and fungi were, but not in the case of bacterial population. This means, in this soil with dense Salicornia, it is difficult to obtain good-natured soils in short time without a higher population of bacteria. For the rapid utilization of the land soil, in this view of point, the methods increasing the number of bacteria in the soil are needed as well as the cultivation and harvesting Salicorniu which indicated in the privious paper(Hong, et al., 1969a). According to the results of this experiment, the changes of soil-microbial populations in the reclaimed tidal land soil containing high salinity depend deeply upon the interrelations of many environmental factors such as soil-salinity, soil-components and contents, concentration of organic matters, pH, aeration, and air and soil temperatures, as in the general soils.

• 한국조경학회지
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• 제31권6호
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• pp.85-94
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• 2004

This study was carried out to analyze physicochemical properties according to the soil height and to the six types of sites that were used as planting ground in the reclaimed land from the sea, Gwangyang Bay. The physicochemical properties of the soil types were tested by t-test(p<0.01, 0.05), at each of the 6 planting ground sites(p<0.01, 0.05), and at each height(p<0.01) of the planting grounds. These areas were tested by ANOVA and were significantly different. Improved soil was better than reclaimed soil from the sea for Zelkova growth because the improved soil contained lower amounts of pH, ECe, N $a^{+}$, $Ca^{++}$, $Mg^{++}$ SAR. Due to freedom from variables such as salt content in the underground as well as the physical and chemical disturbance of the soil, favorable planting ground for tree growth was recorded at the higher grounds than at the lower ones. Soil detriment to the tree growth in the studied sites included elements such as soil hardness, and the distribution of sodium in the tree root systems. The planting grounds for the favorable growth of landscape trees were determined in the following order: the grounds of mounding> the coved ground of improved soil, and the filled ground of improved soil.l.l.l.

• Journal of Plant Biology
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• 제12권1호
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• pp.7-14
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• 1969

Korea has a lots of margin for security of farm land from her coastal region. The area of saline soil may be reached about 10% of present farm land if the reclamation works are finished. This paper was conducted as a part of studying the possibilities of desalination of saline soil through the experiment of some halophytes. The halophytes in this works were Salicornia herbacea L., Suaeda glauca Bunge, chenopodium acuminatum Willd, and Scirpus triquerter L. Of the above halophytes, Salicornia was proved the most effective plant for desalination of saline soil referring to the following results; 1) The seasonal uptake of chloride by Salicornia was the highest of all. However, the general tendencies of all plants showed a decrease on August. 2) Salinity of soil showed the lowest value on the site where Salicornia was grwon densely. Comparing the other sites grouped by age of saline soil with the above site, the salinity of rice-paddy (10 years after reclamation) is similar to those of the site wehre Salicornia were as well as the 50 cm below the surface soil. 3) The maximum water holding capacity of surface soil appeared in the site of Salicornia, but in 50 cm below the surface, the maximum water holding capacity are almost on equat terms having no connection with the age of saline soil. Soil pH, other chemical compositions such as organic matter, magnesium, potassium, phosphorous, and nitrate were determined to elucidate the relationship between the changes of soil properties and chemical uptakes by certain halophytes. It is assumed that the above chemical compositions are frequently affected by the factors such as coastal circulation of salts, exchangeable base, microbial growth, climatic conditions, and irrigation of water.

• 한국토양비료학회지
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• 제31권2호
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• pp.120-127
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• 1998

우리나라 간척지 토양의 물리 화학적 특성을 체계적으로 정확히 분석하여, 개발초기 고염도 간척지의 합리적인 제염대책을 수립하기 위한 제염예측기법을 개발하는데 기초자료를 제공하고자 본 연구를 수행하였다. 전국 대단위 기존 간척지구, 현재 시행중에 있는 간척사업지구 및 간척 예정지구를 대상으로 11개 간척지구에서 채취한 306점의 공시토양을 분석하여 얻은 결과를 요약하면 다음과 같다. 간척사업 준공지구, 시행중지구, 예정지구별 가비중과 진비중의 평균값은 각각 1.30, 1.34, 1.32 및 2.62, 2.64, 2.65이고 전체평균은 1.33 및 2.64로 나타났다. 또한 공극율과 포화도의 평균값은 각각 50.4, 49.3, 50.2% 및 54.7. 57.1, 54.0%이고 전체평균은 49.6% 및 56.3%로 조사되었다. 조사지역의 토성분포는 전체 306개 조사지점중에서 미사토가 약45%, 미사질양토가 약45%, 양토가 약 10%를 차지하고 있으며, 토성이 미사토와 미사질양토인 지역을 합하면 전체의 약 90%에 달하였다. 따라서 우리나라 간척지의 토성은 대부분 미사를 다량으로 함유하고 있는 미사토 또는 미사질양토인 것으로 나타났다. 조사지역 토양의 염분농도는 전체 306개 조사지점중에서 전기전도도(EC) $20{\sim}30dS\;m^{-1}$인 토양이 약 63%, $30{\sim}40dS\;m^{-1}$인 토양이 약 23%의 분포를 보이고 있어 전체의 약 86%정도가 $20{\sim}40dS\;m^{-1}$ 범위내에 있으며, 개발초기 간척지토양의 염분농도를 대략 $20{\sim}40dS\;m^{-1}$ 범위로 볼수 있다고 판단된다. 조사지역 토양의 pH값은 전체적으로 6.5~7.9 범위내에 분포되어 있고, 전체평균값은 7.2로 조사지역별로 큰 차이가 없다. 공시토양의 치환성나트름백분율(ESP)은 38%가 ESP 30~40%, 53%가 ESP 40~50%로 전체의 약 90%이상이 ESP 30~50 % 범위내에 분포되어 있으며, 개발초기 간척지의 치환성나트륨백분율은 대략 30~50%범위내에 있다고 본다. 기존의 관련 실험결과와 본 조사지역 토양의 염분농도(전기전도도), 치환성나트륨백분율 및 pH 등 이화학적성질을 종합해서 분석해 볼 때, 우리나라 간척지토양은 U. S. Salinity Laboratory의 염해토양분류법상 염류알칼리토양에 속한다고 판단된다.

• 한국작물학회지
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• 제54권4호
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• pp.339-345
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• 2009

서남부 간척지에서의 고품질 쌀 생산을 위한 생태형별 적정 이앙시기를 구명하고자 2002년부터 2004년까지 호남농업연구소 계화도출장소 시험포장 문포통(세사양토, 토양 염농도 0.1%)에서 운광벼, 고품벼, 삼광벼, 신동진벼, 청호벼, 호평벼를 공시하여 이앙시기별 벼 생육, 수량구성요소, 수량 및 품질 관련형질을 검토한 결과를 요약하면 다음과 같다. 1. 단위면적당 영화수는 생태형에 관계없이 5월 20일 이앙에서 가장 적고 그 이후 이앙에서는 일반적으로 비슷한 경향을 보였다. 2. 중만생인 호평벼는 등숙비율이 5월 20일 이앙에서 높았으나, 기타 품종들은 6월 1일 이후 이앙에서 높았다. 3. 완전미 비율은 이앙시기간에 일반적으로 이앙시기가 늦어짐에 따라 높아지는 경향을 보였으며, 단백질함량은 운광벼 및 삼광벼는 조기 이앙에서, 고품벼, 신동진벼 및 청호벼는 만기 이앙에서 높은 경향이었으나 호평벼는 이앙기간에 뚜렷한 차이를 보이지 않았다. 4. 완전미 수량은 운광벼, 신동진벼, 호평벼는 6월 10일과 6월 20일 이앙에서 높고 삼광벼 및 청호벼는 6월 1일과 6월 20일 이앙에서 높았다. 5. 따라서 완전미 수량, 등숙비율, 미질 등을 고려한 이앙적기는 중만생종인 삼광벼, 청호벼, 호평벼는 6월 1일, 조생종인 운광벼와 중만생종인 신동진벼은 6월 10일로 판단된다.

• 한국작물학회지
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• 제50권spc1호
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• pp.41-45
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• 2005

서남부 간척지에서의 고품질 쌀 생산을 위한 생태형별 적정이앙시기를 구명하고자 2002년부터 2004년까지 호남농업연구소 계화도출장소 시험포장 문포통(세사양토, 토양 염농도 $0.1\%$)에서 삼천벼, 화성벼, 남평벼를 공시하여 이앙시기별 벼생육, 수량구성요소, 수량 및 품질 관련형질을 검토한 결과를 요약하면 다음과 같다. 1. 단위면적당 영화수는 생태형에 관계없이 이앙시기가 빠를수록 많은 경향이었다. 2. 삼천벼의 등숙비율은 조기이앙에서, 화성벼는 6월 9일 이후 이앙에서 높았다. 3. 완전미 수량은 삼천벼와 화성벼는 이앙시기가 빠를수록 많았고 남평벼는 5월 30일 이앙에서 많았다. 4. 따라서 완전미 수량, 등숙비율, 미질 등을 고려한 이앙적기는 조생종은 5월 20일$\~$5월 30일, 중생종과 중만생종은 5월 30일$\~$6월 9일로 판단된다.

• 한국환경농학회지
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• 제17권2호
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• pp.122-126
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• 1998

작물들의 염분에 대한 반응을 알아보기 위해 200mM의 NaCl이 들어있는 영양액을 공급하는 사경재배를 통하여 작물들의 내염성을 비교하였고,간척지 토양에 파종하여 작물들의 출현율과 초기생육을 관찰하였다. 작물종 중 내염성이 강한 종은 목화, 보리, 밀, 옥수수 등으로 이들은 200mM의 NaCl이 함유된 영양액에서 고사하지 않고 생육이 가능하다. 그러나 녹두, 완두, 팥, 콩과 갚은 콩과작물이 염분에 특히 약하였다. 작물을 간척지 토양에 파종했을때 건물중의 피해가 가장 심하였고, 출현율, 초장 순으로 염분에 대한 반응 정도가 작았다. 또한 염분 정도가 증가함에 따라 작물체의 엽수도 감소하였다. 공시 작물들의 초장이 50% 저해 되는 염분 농도를 추정해 볼 때 화본과의 벼, 보리, 옥수수는 각각 22.6, 56.9, 40.4ds/m의 EC에서 초장 50% 저해되었고, 콩과 작물인 녹두와 콩은 각각 22.6과 21.7ds/md의 EC에서 초장이 50% 감소됨을 추정할 수 있었다.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2005년도 국제학술회의
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• pp.136-137
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• 2005