• 한국물환경학회지
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• 제32권6호
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• pp.546-551
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• 2016

In this study, capping with recycled aggregate and natural zeolite in marine sediment was performed to investigate its inhibitory effect on pollutants released from sediment to seawater. An experiment was performed by capping with amendments for 60 days, and concentrations of organic matter (COD), nitrate, phosphate and metallic elements (Ni, Zn, Cu, Pb, Cd, As, and Cr) were measured. Two capping materials effectively suppressed pollutant release. Recycled aggregate showed better effectiveness for organic pollutant, nitrate and phosphate release. Meanwhile, natural zeolite was effective for metallic elements. As a result, recycled aggregate and natural zeolite can be considered as cost-effective/inexpensive capping material candidates. Also, the capping material can be selected according to the target pollutant.

• 한국유기농업학회지
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• 제21권2호
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• pp.125-137
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• 2013

The Purpose of this paper is to estimates consumers' willingness to pay for Urban Agriculture Park attributes. we analysis the marginal WTP by choice experiment method. Choice experiment (CE) is designed to elicit the marginal WTP differences among urban agriculture park attributes (garden scales, learning and experience area, leisure and relaxation area and fund). The results of multinomial logit model are meaningful, the total marginal WTP on the urban agriculture park attributes is 18,852 won. gardens scales is 2,949 won, learning and experience area is 11,284 won, leisure and relaxation area is 4,619 won. In the current laws, the facilities related to urban agriculture park is not. Taking advantage of the new urban agriculture park, Amendments of the law is required.

• 농업과학연구
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• 제47권1호
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• pp.193-204
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• 2020

This experiment was conducted to study the effect of organic fertilizer on the growth of Peucedanum japonicum Thunberg and the change of soil chemical characteristics. The organic matter contents of coffee sludge and dried food waste powder were 44.26 and 51.18%, respectively. These values exceed the organic matter content of organic fertilizers recommended by the Rural Development Administration (RDA) of South Korea by more than 30%. Accordingly, they indicate the possibility of their use as organic fertilizers. The results from the analysis of soil properties after cultivation showed that the organic matter content of coffee sludge amended soils was two-fold higher than that of dried food waste powder amended soils. However, the content of available phosphorus was two times lower in the coffee sludge amendments. It is expected that the dried food waste powder was actively used to decompose organic substances, and that phosphoric acid was added by the soil microorganisms used to decompose organic substances. In terms of Peucedanum japonicum Thunberg growth, leaf discoloration was observed for all treatments except with the standard rate of dried food waste powder. The standard rate of dried food waste powder also produced relatively better results than other treatments with regard to other growth characteristics such as root length (34.08 cm), root diameter (0.78 cm), and fresh root weight (4.77 g plant^-1). Therefore, the standard rate of dried food waste powder produced better results than other treatments and can be used as an organic fertilizer in the growth of Peucedanum japonicum Thunberg.

• 한국유기농업학회지
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• 제22권4호
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• pp.719-730
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• 2014

화산회토양 감자 연작지 토양 pH 수준별로 고토석회, 유황, 황산칼륨, 패화석, 규산질비료, 석회질소, 유안비료를 이용하여 감자 더뎅이병 발생을 경감시키고 토양건전성을 유지하는데 적절한 대체농자재를 선발하고자 수행하였다. 토양 pH가 낮은 황산칼륨 처리구(24 kg/10a)에서는 더뎅이병 발병률이 84.4%, 발병도가 28.4%로 가장 낮았다. 방제효과는 12.3%, 상품율은 93.2%로 다른 처리구와 비교할 때 가장 높게 나타났다. 석회질소 처리구(60kg/10a)가 발병도 38.3%로 낮았고 방제효과 23.8%, 상품율 66.3%로 높았다. 토양 pH가 높은 시험구 중 더뎅이병 발병률은 석회질소 처리구(60 kg/10a)가 38.3%로 가장 낮았고 유안 처리구(48 kg/10a)는 62.6%로 높았다. 더뎅이병 방제효과는 석회질소 처리구(60 kg/10a)에서 23.8%로 유황 처리구의 6.1% 보다 4배 이상, 상품률은 66.3%로 가장 높게 나타났다. 감자더뎅이병 병원균 Streptomyces acidiscabies과 Streptomyces scabiei를 석회질소 2.5, 5 g/L, 10 g/L에 접종시 생장량은 다른 토양개량제 보다 상대적으로 억제되었다. 결론적으로 감자 파종 전에 토양 pH가 5 이하이면 황산칼륨을, 6 이상이면 석회질소를 시비하면 더뎅이병 발생을 경감시킬 수 있을 것으로 보인다.

• 한국환경농학회지
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• 제40권4호
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• pp.295-312
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• 2021

BACKGROUND: Global warming is one of the most pressing environmental issues which concomitantly complicates global climate change. Methane emission is a balance between methanogenesis and methane consumption, both of which are driven by microbial actions in different ecosystems producing methane, one of the major greenhouse gases. Paddy fields are major sources of anthropogenic methane emissions and could be compounded by organic fertilization. METHODS AND RESULTS: Literature reviews were conducted to give an overview of the global warming conditions and to present the relationship of carbon and methane to greenhouse gas emissions, and the need to understand the underlying processes of methane emission. A more extensive review was done from studies on methane emission in paddy fields under organic fertilization with greater emphasis on long term amendments. Changes in paddy soils due to organic fertilization include alterations of the physicochemical properties and changes in biological components. There are diverse phylogenetic groups of methanogens and methane oxidizing bacteria involved in methane emission. Also, multiple factors influence methanogenesis and methane oxidation in rice paddy fields under organic fertilization and they should be greatly considered when developing mitigating steps in methane emission in paddy fields especially under long term organic fertilization. CONCLUSION(S): This review showed that organic fertilization, particularly for long term management practices, influenced both physicochemical and biological components of the paddy fields which could ultimately affect methanogenesis, methane oxidation, and methane emission. Understanding interrelated factors affecting methane emission helps create ways to mitigate their impact on global warming and climate change.

• Ecology and Resilient Infrastructure
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• 제4권3호
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• pp.180-185
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• 2017

광산 활동에 의해 오염된 농경지의 복원은 개량제 처리와 복토를 기반의 미량원소 안정화 기법으로 진행되고 있다. 최근 복원된 부지 중 경사 농경지에서 토양 유실 문제가 대두되고 있다. 본 연구에서는 4종의 개량제 (벤토나이트, 석회, 유기물, 제강슬래그)를 다양한 비율로 단일 또는 복합처리 한 후 입단 형성의 효율을 평가했다. 복토재는 점토함량이 다른 3가지 토양 (A 토양=9.4%, B토양=14.7%, C 토양=21.2%)을 대상으로 했다. 단일처리 결과, A 토양은 유기물 5%, B와 C 토양은 석회 5%가 각 토양의 대조구에 비해 입단 형성이 가장 효과적이었다. 9가지 복합처리구 중에서 A 토양은 유기물 3% + 석회 1%, B와 C 토양은 유기물 1% + 석회 3% 처리구의 입단 형성이 가장 높았다 (A 토양=30.4%, B 토양=25.0%, C 토양=36.5%). 현장처리를 위해 각 복토재 (A 토양=0.045, B 토양=0.051, C 토양=0.054)와 국내 농경지의 평균 (0.032) 토양침식인자 차이만큼을 개량제에 의한 목표 입단 형성량으로 설정하였다(29.1% 입단형성). 비용편익을 고려한 최적 개량제 선정한 결과 A와 B 토양은 석회 3%, C 토양은 석회 5%가 가장 적합 했으며, 이를 통한 경사진 복원된 경사 농경지에서 토양 유실을 효과적이고 경제적으로 저감할 것으로 예측된다. 본 연구에서 석회 처리에 의한 토양 알칼리도 상승은 고려하지 않았다.

• 한국작물학회지
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• 제65권4호
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• pp.436-446
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• 2020

토양검정에 의한 유기자원 시비처방 효과를 구명하기 위하여 감자를 대상으로 포장시험을 실시하였으며, 유기자원 시비량은 유기자원의 질소, 인산, 칼륨 성분함량에 무기화율을 적용하여 결정한 결과를 요약하면 다음과 같다. 1. 질소 및 칼리의 이용효율은 화학비료와 유기자원처리의 차이가 없었으며, 인산의 이용효율은 0.1% 수준에서 유기자원구에서 높았다. 2. 감자 수확 후 토양화학성은 전기전도도, 질소 및 인산 함량이 유기자원구에서 높았다. 3. 감자 잎·줄기의 무기성분 중 질소 함량은 화학비료구에서 가장 높았고, 무처리구에서 가장 낮았다. 인산 및 칼륨 함량은 무처리구에서 가장 높았다. 인산은 화학비료구와 유기자원구의 차이가 없었고, 칼륨은 화학비료구에서 함량이 더 높았다. 4. 뿌리의 무기성분 함량도 잎·줄기에서와 같은 경향을 보였지만 건물중에 있어서는 수량이 많았던 유기자원구에서 가장 높았다. 5. 화학비료구와 유기자원구간 초장, 경수, 경경 및 엽색도는 차이가 없었지만 무처리구보다 높았다. 6. 괴경수량, 상서수량은 유기자원구에서 화학비료구보다 높은 경향이었으며 무처리구보다 높았다. 7. 지상부생체중과 T/R율은 유기자원구>화학비료구>무처리구 순이었다. 8. 초장은 경수, 경경, 괴경중, 상서중, 지상부생체중, T/R율 및 감자의 건물함량과 양(+)의 상관관계가 인정되었으며, 괴경중은 초장, 경수 및 경경과 양(+)의 상관관계가 인정되었다. 괴경중이 높을수록 상서중도 높았고, 지상부생체중이 높을수록 수량도 높은 양(+)의 상관관계가 인정되어 수량을 키우기 위해서는 지상부도 적정 이상으로 키우는 양분공급이 필요하다. 9. 이상의 결과를 볼때 본 연구에서 유기자원으로 처방한 시비방법은 화학비료대비 적정한 유기자원 처방법으로 활용가능하며, 후작물 재배에도 유리할 것으로 판단된다.

• 한국토양비료학회지
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• 제51권1호
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• pp.50-60
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• 2018

This study was to evaluate the effect of organic amendments incorporation on soil properties and plant growth under two different soil salinity levels and various cultivated crops at Saemangeum reclaimed tidal land for three years from 2012 to 2014. The soil texture of the experimental site was sandy loam. Four different crops, sesbania (Sesbania grandiflora), sorghum-sudangrass hybrid (Sorghum bicolor-Sorghum sudanense), rice (Oryza sativa L.) and barley (Hordeum vulgare) were cultivated at low (< $1dS\;m^{-1}$) and high (> $4dS\;m^{-1}$) soil salinity levels. The soil salinity was significantly lowered at the rice cultivation site compared to continuous upland crops cultivation site in high soil salinity level. But the soil salinity was increased as cultivating sesbania coutinuously in low soil salinity level. The soil organic matter content was increased with the incorporation of straw at the continuous site of rice and barley, and the average of soil organic matter was increased by $0.9g\;kg^{-1}$ per year which was effective in soil aggregate formation. The highest biomass yield plot was found in barley (high salinity level) and sesbania (low salinity level) cultivation site, respectively. Our research indicates that rice cultivation in paddy field with high salinity level was effective in lowering soil salinity and sesbania cultivation was useful to biomass production at upland with low salinity. In conclusion, soil salinity and organic matter content should be considered for multiple land use in newly reclaimed tidal land.

• 한국유기농업학회지
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• 제16권3호
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• pp.299-308
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• 2008

유기상토에 툽밥 발효 돈분으로 생산한 분립의 첨가비율을 달리했을 때, 벼의 유식물체 생육에 미치는 영향을 조사하였다. 저면도포 무처리구에서 추청 벼는 분립 20%까지의 혼합비율, 흑미 벼는 분립 10%까지의 첨가비율에서 유식물체의 생육이 양호하였다. 또한 저면도포 처리구에서는 추청 벼와 흑미벼 모두 분립 5% 혼합비율에서 유식물체의 생육이 양호하였다. 저면도포 처리구가 무처리구에 비하여 낮은 분립 첨가비율에서 유식물체의 생육이 양호하였던 것은 뿌리신장에 의하여 토양표면에 시용된 분립으로부터 생육에 필요한 양분의 공급이 이루어졌기 때문으로 추정된다. 또한 장기간 벼를 육묘할 경우에는 유식물체의 생육이 양호하였던 분립의 적정 혼합비율의 범위가 갖는 상토의 이화학성의 유지가 필요하다고 판단된다. 지렁이 분립의 이화학적 특성으로 볼 때, 유기 경종농업에서 토양시용 또는 상토재의 원료로서 유용하게 활용될 수 있을 것으로 판단된다.

• Journal of Applied Biological Chemistry
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• 제49권1호
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• pp.28-32
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• 2006

Effect of organic-C on immobilization and nitrification patterns in acidic soil was examined during 20 weeks incubation period to verify if organic amendments such as composted material can increase soil retention of N by stimulating microbial immobilization of $NH_4^+$. Four treatments were laid out: control without fertilizer N and glucose (treatment code: S), ammonium sulfate (SN), ammonium sulfate with single glucose at the commencement (0 week) of incubation (SNG), and ammonium sulfate with double glucose at 0 and 4 weeks of incubation (SNGG). Glucose application (SNG) significantly increased microbial immobilization of $NH_4^+$ within 1 week of incubation over SN. Immobilization was followed by remineralization thereafter; however, second-application of glucose (SNGG) restored $NH_4^+$ immobilization. At the same time, nitrification was significantly inhibited by glucose application as indicated by consistently low $NO_3^-$ concentration in SNG and SNGG soils, suggesting that microbial assimilation of $NH_4^+$ is predominant compared to nitrification when available C-source is abundant. These results suggest application of chemical fertilizer-N with organic amendment would have beneficial effect on soil-N retention and environmental conservation by reducing production of $NO_3^-$ which is likely to be lost through leaching or denitrification.