• Title/Summary/Keyword: 토양제염

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Liming Materials and Desalinization of Marine Originated Tidal Soil (석회(石灰)의 종류(種類)와 해성간척지(海成干拓地) 토양(土壤)의 제염(除鹽))

  • Oh, Wang-Keun
    • Korean Journal of Soil Science and Fertilizer
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    • v.23 no.2
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    • pp.107-113
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    • 1990

  • In comparision with calcium sulphate, the effect of calcium-carbonate, -silicate and -hydroxide on desalinization of tidal saline soil was investigated in a continuous leaching column experiments after mixing with an equivalent amount of Ca to sodium plus magnessium in the saline soil. One half of liming materials was mixed to the top one-tenth of column soil and the remainder was spread on the surface. Results obtained are as follows ; 1. Gypsum made easy to percolate and desaline (Na) tidal marine soil but accumulated magnessium in subsoil. 2. $Ca(OH)_2$, $CaCO_3$, and $CaSO_3$ precipitated Mg in the soil which limes were mixed, but they washed down magnessium more severely from the immediate bellow the limed soil and less from the subsequent soil layers. This leaching was more severer at the treatment of $Ca(OH)_2$and lowest at the treatment of $CaSiO_3$. 3. The alkalinity of lime in addition to the dissociation of exchangeable Na raised pH of limed leached tidal soil and slowed down the percolation rate which retarded desalining Na from limed saline soils. This effect was most severe in the $Ca(OH)_2$ treated soil. 4. pH of leached soils was correlated possitively with exchangeable Na and negatively with exchangeable Mg giving follwing relationship pH= 7.77+0.489 Na/Mg r = 0.845.

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Characteristics of a Reclaimed Tidal Soil for Effective Resalization at Saemangum and Youngsan-River

  • Chung, Doug-Young;Kim, Hyejin;Park, Misuk;Lee, Sang-Eun
    • Korean Journal of Soil Science and Fertilizer
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    • v.45 no.6
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    • pp.1222-1229
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    • 2012

  • The total area of a reclaimed tidal soil distributed on the south-west coast is approximately 156,600 ha, and the soil contains high contents of sand and silt as well as highly saline. Most of the reclaimed tidal soils are used as a paddy due to bad permeability and high groundwater table, resulting in easy accumulation of salts on the soil surface by capillary rise. Therefore, resalinization may occur because of rise of groundwater table after desalinization. The researches related to the reclaimed tidal soil mainly focused on desalinazation while most of the researches completed were limited to yields of crop based on desalinazation. pH of old reclaimed tidal soil is neutral or less than 7 while that of newly developed reclaimed tidal soils is greater than 7, that cause N-fertilizer to be volatile as ammonia. Thus, the physical and chemical properties should be investigated to be used as an arable upland instead of a paddy soil due to change in government policy. We need to develop measures to make soils grow crops normally by identifying problems related to reclaimed tidal soils.

  • https://doi.org/10.7745/KJSSF.2012.45.6.1222 인용 PDF KSCI

A Taxonomical Consideration based on Changes of Salinity and Profile Features of the Texturally Different Two Reclaimed Tidal Soils (간척지 염해답토양의 토성별 제염기간 및 단면특성변화를 기준한 분류학적 고려)

  • Son, Yeon-Kyu;Hyeon, Keun-Soo;Seo, Myung-Chul;Jung, Kang-Ho;Hyun, Byung-keun;Jung, Suk-Jae;Song, Kwan-Chul
    • Korean Journal of Soil Science and Fertilizer
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    • v.39 no.2
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    • pp.59-64
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    • 2006

  • To analyze the changes of soil physico-chemical properties after reclamation, we carried out an experiment for 75 samples of representative saline soils in South Korea. The more the years after reclamation is proceeded, the blighter the soil color is, soil horizon differentiation and structure is developed, but electrical conductivity(EC) decreased. After the soil survey, coarse textured soils were more quickly de-salined than the fine textured soils. In case of fine loamy textured Poseung series, it could be estimated that the series had Salic horizons in sub-order level of taxonomical classification. In other case of coarse loamy textured soil series, it could be estimated that the series had Sodic properties in sub-group level. Sodium contents of fine loamy textured soils were not decreased after reclamation, but those of coarse loamy textured Gwanghwal series reclaimed about 76 years ago were reclassified because of desalinization. To be desalined low to 4 dSm-1 of EC, it presumably takes about 108, or 12 years for fine loamy and coarse loamy textured soils, respectively.

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