• 한국토양비료학회지
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• 제48권6호
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• pp.683-688
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• 2015

Nowadays, sustainable and environment-friendly agriculture has become an important issue all around the world, and repeated applications of mineral and/or organic fertilizer will probably affect mineral nutrient dynamics in soil in the long term but only a limited number of observations are available. This study was carried out to investigate whether there is any influence of different fertilizer management for red pepper (Capsicum annuum L.) cultivation on soil physicochemical properties, leaf mineral content, yield and fruit quality in the aspect of long-term practice in open field condition. NPK, NPK+compost, compost only, and unfertilized control plot were included in the treatments. The application of chemical fertilizer and/or compost repeated annually for 17 years from 1994 to 2011. Soil organic matter content was higher in compost treatments than in no-manure treatments. Available phosphate and the yield of red pepper were highest in NPK+compost treatment followed by NPK (chemical fertilizer), compost, and control. The results indicate that in the long term, nitrogen supply is still needed for increasing red pepper yield, but reduction in the use of chemical fertilizer could be also possible with the proper application of compost.

• 환경정책연구
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• 제9권2호
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• pp.41-55
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• 2010

댐은 사회전반에 걸쳐 많은 편익을 제공하고 있다. 이를 위해서는 일정수준 이상의 저수용량 확보가 필수적이다. 그러나 상류의 토사 유입으로 인하여 댐의 저수용량은 줄어들고 있는 실정이다. 전 세계적으로 5조 톤의 토사가 매년 댐 뒤에 쌓이는 실정이다. 강이 여러 지역에 걸쳐 흐르는 경우 상류의 농업에서 발생하는 토사는 장시간에 걸쳐서 지속적으로 발생하기 때문에 상류 농업종사자들은 관리를 소홀히 하는 경향이 있다. 특히 토사는 댐의 저수용량을 지속적으로 줄여 궁극적으로는 댐의 경제적 가치를 소멸시키는 효과가 있다. 따라서 상류 지역의 토사저감 노력과 함께 댐의 저수용량 확보가 급선무이다. 실증분석으로 나일강 상류의 수단 농업지역과 하류의 이집트 Aswan High Dam을 분석하였다. 실증분석 결과 상류 농업부문의 토사저감 노력과 댐의 토사제거 방안이 사회전체의 경제적 편익을 극대화하는 것으로 나타났다. 동태적 최적제어이론을 이용한 유역토사관리 모형에서 댐의 경제적 편익을 포함한 사회전체의 편익은 크게는 약 1,510억 달러로 추산되었다.

• 적정기술학회지
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• 제6권2호
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• pp.88-93
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• 2020

Kaanaeli Agri Business intends to increase Vanilla production by establishing A DEMO Plot at Ngyeku Village and Conducting Seminars/workshops to Farmer's groups, mainly on Sustainable Vanilla husbandry and Fish farming practices with affordable and customized methods involving: • Proper land use demarcation at household levels • Soil fertility management • Bio-intensive agriculture practices (Organic farming) • Environmental conservation and • To address Market issues, to medium and smallholder farmers of Meru district, Arusha-Tanzania.

• Geomechanics and Engineering
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• 제31권4호
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• pp.409-422
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• 2022

The use of calcium sulfoaluminate (CSA) cement as a rapid-hardening cement admixture or eco-friendly alternate for ordinary Portland cement (OPC) has been attempted over the years, but the cost of CSA cement and availability of suitable aluminium resource prevent its wide practical application. To propose an effective ground improvement design in sandy soil, this study aims at blending a certain percentage of CSA with OPC to find an optimum blend that would have fast-setting behavior with a lower carbon footprint than OPC without compromising the mechanical properties of the cemented sand. Compared to the 100% CSA case, initial speed of strength development of blended cement is relatively low as it is mixed with OPC. It is found that 80% OPC and 20% CSA blend has low initial strength but eventually produces equivalent ultimate strength (28 days curing) to that of CSA treated sand. The specific OPC-CSA blend (80:20) exhibits significantly higher strength gain than using pure OPC, thus allowing effective geotechnical designs for sustainable and controlled ground improvement. Further parametric studies were conducted for the blended cement under various curing conditions, cement contents, and curing times. Wet-cured cement treated sand had 33% lower strength than that of dry-cured samples, while the stiffness of wet-cured samples was 25% lower than that of dry-cured samples.

• 자원리싸이클링
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• 제21권1호
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• pp.17-29
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• 2012

대전시 ${\bigcirc}{\bigcirc}$ 권역 택지발지구내 불법매립지 선별 정비사업과정에서 회수된 선별결과물의 재활용성 및 에너지전환 기능성을 평가하였다. 본 연구에서 사용된 순환형 매립정비시스템(SLR-System, Sustainable Reclamation-System)은 수분함량 약 28.0%조건에서 약 91.4 $m^3/hr$ (about 130.61 ton/hr)의 처리 성능을 보였으며, 선별결과물의 회수율과 순도는 선별토사가 약 98.9%와 약99.66%, 선별가연물류가 약 91.8%와 약 92.0%로 각각 측정되었다. 특히, 선별토사의 경우, 입도크기가 ${\O}$35 mm이하로 유기이물질 함량이 0.31%(V/V)로 재활용법적 기준치를 만족하였으며, 최대 약 98.42%까지 재활용이 가능한 것으로 평가되었다 또한, 선별가연물의 경우, 저위발열량이 약 3,636 kcal/kg으로 RDF 품질기준을 만족하였으며 최대 약 84.43%까지 RDF 생산이 가능한 것으로 측정되었다.

• 한국조경학회지
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• 제44권3호
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• pp.56-64
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• 2016

친환경 건축물만이 아닌 지속가능한 대지개발 및 외부환경 조성에 대한 관심과 중요성이 높아짐에 따라 미국에서는 기존 친환경 건축물 인증제인 LEED와는 별도로 Sustainable Sites Initiative(SITES)라는 인증체계를 구축하고, 이를 통해 다양한 유형의 외부공간의 친환경 요소들을 평가하고, 개발 전 과정동안 지속가능하고 통합적인 디자인이 실현되도록 유도하고 있다. 본 연구는 SITES 인증을 획득한 프로젝트들의 구체적인 친환경 전략과 적용기술 등을 분석함으로써, 친환경적인 외부공간 조성기법과 평가체계를 검토하고, 국내 외부환경 친환경 평가체계의 개선에 대한 시사점을 얻고자 하였다. SITES 인증을 받은 텍사스 지역 세 대상지의 친환경요소 분석결과, 건축물 중심의 친환경 인증과 달리 토양, 식생, 물 보전 등 조경분야에서의 다양하고 실질적인 친환경 전략과 방법들이 적용되고 있었다. 또한 인증과정을 통해 다양한 분야의 전문가들이 협력하고 소통하는 통합적 디자인과 주민들의 참여가 이루어지고, 환경교육 및 실천으로 이어질 수 있도록 하고 있다. 외부환경 및 녹지의 친환경적 평가기준이 부족한 현실에서 국내 상황에 적합한 현실적이고 실효성 있는 외부환경 친환경 인증 및 평가체계가 필요할 것으로 판단되며, 본 연구는 향후 이러한 논의를 위한 기초자료로 활용될 수 있을 것으로 기대된다.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2002년도 추계학술발표회
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• pp.355-358
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• 2002

A sediments are Integral called as gravel, sand, clay, mineral materials which are settling in bottom layer of reservoir, stream, and oceans from land. In practical problems relations of sediments are flood by decreed of flow capacity and down of water quality. Dredged sediments are composed with constructed material and variety of pollutant compounds. Therefore, it is very much of cost effects in nationally, if development for use of constructed material separated only constructed material within sediments. And it will be continue to the dredge operation of stream sediment for retrofit of water environment and sustainable's after the years. The following results could be obtained : In case of high concentration sediments, sample for design of CDF was shown property of flocculent settling. Assuming that average inflow rate is 1, 000㎥/hr, mean residence time( $T_{d}$), average ponding depth( $H_{pd}$ ), and design surface area for flocculent settling( $A_{df}$ ) were 5 hr, 0.6m, and 15, 750 $m^2$ respectivelyrespectivelyy

• 한국농림기상학회지
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• 제4권3호
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• pp.175-196
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• 2002

The increase of meteorological uncertainty and unstable fluctuation of its behavior due to the global warming affect the temporal variation and spatial distribution of water resources and water use patterns in agriculture. There have been steady efforts to understand hydrological components and deal with such water related problems. This paper reviews firstly, the future effect of water resources due to climate changes, secondly, recent progress for precipitation, evapotranspiration, soil moisture, and thirdly, GIS/RS based integrated information systems conducted by both researchers and government ministries. There should be continuous studies and investments to cope with climate changes, and to accomplish sustainable development with the help of agricultural water resources. Some research topics were suggested to attempt with substantial contents considering our present capability and situation.

• 한국균학회지
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• 제49권4호
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• pp.517-524
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• 2021

Red pepper seedlings were inoculated either alone or with a mixture of all five species of arbuscular mycorrhizal fungi (AMF). After 10 weeks of growth in the greenhouse, the seedlings were transplanted into fields and cultivated without chemical fertilizers and pesticides for 10 weeks. The results showed that plant growth was significantly increased under both greenhouse and field conditions, suggesting that AMF inoculation has a positive effect on the growth of Capsicum annuum and improves the physical properties of the soil by increasing the concentration of glomalin. The application of AMF can positively contribute to sustainable agriculture by reducing the use of chemical fertilizers while increasing crop growth.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1999년도 국제 심포지엄 Proceedings of International Symposium on 친환경농업과 기계화방향
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• pp.137-159
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• 1999

Over the last three decades, Korean farming system has been directed to maximum agricultural production and to increase farmer's income through adoption of high-yielding crop varieties and high input of agrochemicals . These farming practices have resulted in problems of water-quality deterioration, soil degradation , and food safety. At present, over 40 million tones of animal waste are bing produced annually, which amounts to disposing the waste at the annual rate of 20 tones per ha in the total area of farming land in Korea. Nearly a half of total available water resources is used as irrigation water predominantly for rice paddy field. Thus, non-point source contamination of the water resources has been linked to agriculture across the nation. However, the extent to which agriculture contributes to the water quality is not fully known. Recently, Korean government provided various institutional measures to reduce the negative impacts of agricultural practices on the environ ental quality, and the Agricultural Environment Act was also passed by the legislature in 1998 and became effective January 1999. This Act does not cover the broad spectrum of the sustainable agriculture ; thus, the limited incentives within this Act are arguably ineffective to control the non-point source pollution. Recently new bulk blending of fertilizers(BB fertilizer) are bing produced (100, 000 tones in 1998) with Government subsidies. The BB fertilizers are to balance N-P-K ratio in the soils . Although the use of the BB fertilizers are encouraged with Government subsidies, non-point source pollution is still serious and will become worse. Precision farming is regarded as a new means for sustainable agriculture. It is a new technology that modifies the existing techniques and incorporates new one such as GIS, GPS , differential applicator to produce a new set of tools for the farmer to use. Precision farming, however, has constraints for individual farming practices. For exam le , farm size or parcel unit of each farmer is too small to adopt the precision agriculture on farmhouse-hold bases and farmer's ability to adopt the new technology is limited. However, it would be appropriate to establish local or regional cooperatives to operate such a precision farming system. It is recommended that Government provide sufficient incentives to help establish local and/or regional cooperatives.