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Open Access Journal

Korean Journal of Environmental Agriculture

p-ISSN 1225-3537
e-ISSN 2233-4173

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The Korean Journal of Environmental Agriculture is an official publication of the Korean Society of Environmental Agriculture. It is published quarterly a year, March 31, June 30, September 30, and December 31, and distributed to more than 700 members including individuals and institutions. The abbreviated title is ‘Korean J. Environ. Agric.’ The journal was launched on June 30 in 1982, the Print ISSN was issued on October 30, 1992 (Volume 11, No. 2) while the Online ISSN was issued on December 31, 2010 (Volume 29, No. 4). Whole document of a part of the articles in this journal are listed in the Google Scholar, Korea Citation Index (KCI) and ScienceCentral. The full text is freely available from http://www.korseaj.org.

Creative Commons Attribution Non-Commercial License

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Current Issue 2020. Vol.39, Iss.3more..

  • Effect of KOH Concentrations and Pyrolysis Temperatures for Enhancing NH4-N Adsorption Capacity of Rice Hull Activated Biochar
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    BACKGROUND:

    Recently, biomass conversion from agricultural wastes to carbon-rich materials such as biochar has been recognized as a promising option to maintain or increase soil productivity, reduce nutrient losses, and mitigate greenhouse gas emissions from the agro-ecosystem. This experiment was conducted to select an optimum conditions for enhancing the NH4-N adsorption capacity of rice hull activated biochar.

    METHODS AND RESULTS:

    For deciding the proper molarity of KOH for enhancing its porosity, biochars treated with different molarity of KOH (0, 1, 2, 4, 6, 8) were carbonized at 600℃ in the reactor. The maximum adsorption capacity was 1.464 mg g-1, and an optimum molarity was selected to be 6 M KOH. For the effect of adsorption capacity to different carbonized temperatures, 6 M KOH-treated biochar was carbonized at 600℃ and 800℃ under the pyrolysis system. The result has shown that the maximum adsorption capacity was 1.76 mg g-1 in the rice hull activated biochar treated with 6 M KOH at 600℃ of pyrolysis temperature, while its non-treated biochar was 1.17 mg g-1. The adsorption rate in the rice hull activated biochar treated with 6 M KOH at 600℃ was increased at 62.18% compared to that of the control. Adsorption of NH4-N in the rice hull activated biochar was well suited for the Langmuir model because it was observed that dimensionless constant (RL) was 0.97 and 0.66 at 600℃ and 800℃ of pyrolysis temperatures, respectively. The maximum adsorption amount (qm) and the bond strength constants (b) were 0.092 mg g-1 and 0.001 mg L-1, respectively, for the rice hull activated biochar treated with 6 M KOH at 600℃ of pyrolysis.

    CONCLUSION:

    Optimum condition of rice hull activated biochar was 6M KOH at 600℃ of pyrolysis temperature.

  • Changes in Physical, Chemical, and Biological Traits During Composting of Spent Coffee Grounds
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    BACKGROUND:

    Spent coffee grounds are the most valuable resource for agriculture and industry. However, it is almost thrown untreated into landfills or incineration. Composting is an efficient process for converting spent coffee to fertilizer.

    METHODS AND RESULTS:

    Composting was conducted in the compost pile (40 m3 ) equipped with a forced aeration system. Physical and chemical properties containing temperature, pH, electrical conductivity, and moisture were measured through the composting period. Moreover, biological changes were examined for the composting phase using Illumina Miseq sequencing of the 16S rRNA gene. We found 7-14 phyla comprising 250-716 species from a variety phase of compost. During the composting period, Firmicutes were dominated, followed by Actinobacteria and Proteobacteria

    CONCLUSION:

    The result indicated that the use of spent coffee improved the quality of organic fertilizer and changed the microbial communities, unique to the thermal composting stage, which could enhance the composting process. These findings suggest that spent coffee composted material can provide a significant amount of nutrients, thereby supporting plant growth.

  • Assessment of Growth and Inulin for Jerusalem Artichoke (Helianthus tuberosus L.) Cultivation in Saemangeum Reclaimed Land and Upland Soils
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    BACKGROUND:

    In order to cultivate upland crops in reclaimed land, economically appropriate crops should be selected. Jerusalem artichoke (Helianthus tuberosus L.) is one of the primary sources for inulin in higher plants. The objective of this study was to evaluate and compare growth and inulin of H. tuberosus L. according to the cultivation region in Korea.

    METHODS AND RESULTS:

    21 varieties of H. tuberosus L. were collected in Korea, and then 7 varieties of H. tuberosus L. were selected for this study. To compare growth and inulin, those varieties were cultivated in reclaimed land and upland soils. The growth of H. tuberosus L. significantly decreased when cultivated in reclaimed land. There was an increas at 17.8% in the content of white H. tuberosus L. tuber inulin in reclaimed land.

    CONCLUSION:

    The content of inulin in H. tuberosus L. tubers was found to be dependent on cultivation region and tuber color. There was a difference of the inulin content between the tubers with different colors in reclaimed land. Purple tubers of P20 were considered suitable varieties for cultivation in reclaimed land. White tubers of W1 and W8 were also considered suitable varieties for cultivation in reclaimed land.

  • Assessment of Seasonal Variation in Water Quality in Daedong Lake
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    BACKGROUND:

    Most lakes have increased concerns about water pollution due to the inflow of non-point sources caused by human activities. Therefore, the lake water quality survey was conducted in order to propose effective plans for water quality management by analyzing the characteristics of lakes and the change of water quality.

    METHODS AND RESULTS:

    In order to investigate the physicochemical water quality in Daedong lake, water quality analysis was undertaken from July 2018 to June 2019. Water temperature was ranged from 7.8 to 34.3℃ and pH varied from 6.9 to 10.2. The concentration of Dissolved oxygen, Suspended solid, Biochemical Oxygen Demand (BOD), and Chemical Oxygen Demand (COD) were 5.6 ~ 17.2 mg/L, 2.4 ~ 35.3 mg/L, and 4.5 ~ 15.1 mg/L, and 0.9 ~ 2.8 mg/L, respectively. The Total Nitrogen (T-N) concentration ranged from 0.974 ~ 2.126 mg/L, and Total Phosphorus (T-P) concentration ranged from 0.014 ~ 0.057 mg/L. The Chlorophyll-a (Chl-a) ranged from 2.7 ~ 37.9 mg/m3 . Through Carlson TSIm assessment using T-P and Chl-a results, evaluating trophic state, Daedong lake was evaluated as mesotrophic.

    CONCLUSION:

    Water pollution management plan needs such as nutrient removal technology and nonpoint source management for prevention of eutrophication in Daedong lake.

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