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정덕영,이교석 충남대학교 농업과학연구소 2005 농업과학연구 Vol.32 No.2
In agricultural ecosystem, soils which play important roles of storage and cycling of substances become a crtitical social problem due to rapid increase of contaminants with respect to our health. Soil as productivity should be interpreted as soil quality, that is important criteria in maintaining sustainable agriculture for production of safe food. Therefore, it needs to set the criteria of soil quality by considering environmental factors including relevant parameters which are involved in soil quality soil health because soils are widely distributed and have various characteristics such as physical, chemical, and biological propevties. Therefore, it requires intensive investigation of evaluation methods and development of related parameters for environmentally sound agriculture and safe soil management.
Mechanisms of Adsorption with Respect to Sulfate Mobility in Multispecies Systems of Soils
Chung, Doug Young 충남대학교 농업과학연구소 2000 농업과학연구 Vol.27 No.2
토양내에서 황산이온의 이동성은 산화환원전위, 토양광물 특성, pH, 그리고 환산이온과 토양입자 표면에 흡착에 관여하는 타 음이온들에 의해 영향을 받는다고 아려져 있다. 제시된 황산이온의 흡착 기작은 토양입자 표면과 수용성상태의 음이온간의 상관관계를 나타낸 것이다. 그러므로 흡ㆍ탈착연구로부터 얻어진 적정한 계수를 적용함으로서 다중 이온이 존재하는 토양내에서의 일반적 등온흡착 곡선을 적용할 수 있는 이동모형은 실험적 접근 방법을 수용하게된다. The mobility of sulfate in soils depends on several factors including redox potential, soil mineralogy, pH, and the presence of other anions that compete for sorption sites with sulfate. The proposed model of adsorption mechanism for sulfate postulated that reaction is between anions in solution and charged surfaces of soil particles. With appropriate choice of parameters obtained from the adsorption-desorption experiments, the equation of transport model adapt an empirical approach, capable of handling most general equilibrium adsorption isotherms, suitable for multispecies systems.
Evaluation of Cropping Model of Green Manure Crops with Main Crops for Upland-Specific
Chung, Doug Young,Park, Misuk,Cho, Jin-Woong,Lee, Sang-Eun,Han, Kwang-Hyun,Ryu, Jin-Hee,Hyun, Seong-Hoon 한국토양비료학회 2013 한국토양비료학회지 Vol.46 No.2
For organic farming, green manure crops such as leguminous forages and barley have been broadly used to improve soil fertility and soil physical and chemical properties by repeatedly cutting and mulching them directly as winter crop in the field in the rotation. In this investigation we selected 78 agricultural farm corporations as well as individual organic farmhouses related to crop rotation from greenmanure crops to main crops in order to analyze the relationship of cropping system between main crops and green manure crops. The results showed that the green manure crops were divided into two groups as leguminous and nonleguminous crops, representing that those are limited to specific climate and farming systems of regions. Also the 10 or less green manure crops including sudangrass, hairyvetch, italian ryegrass, sorghun, buckwheat, oat, pea, rye, clover, and canola which belong to leguminous crops which are presently cultivated from the organic farmhouses within the rotational crop system. We also confirmed that the major main crops are sweet potato, soybean, corn, tobacco, spinach from usage frequency analyzed by NetMiner H 2.6 which was used to estimate the rotational cropping system among the green manure crops and main crops.
Overview of Rosetta for Estimation of Soil Hydraulic Parameters using Support Vector Machines
Doug-Young Chung(정덕영) 한국토양비료학회 2009 한국토양비료학회지 Vol.42 No.S2
심층토 내에서의 흐름과 이동과정을 포함하는 연구와 관리 측면에서 수학모델에 대한 관심도가 점점 증가하고 있다. 로제타는 토성이나 용적밀도 자료와 같은 대체 토양자료로부터 불포화수리특성에 대한 자료를 추정하는 프로그램이다. 이와 같은 형태의 모델은 애초 기본 토양자료를 수리특성자료로 전환하기 시작한 이래 대체 측정수단으로서 PTF라 불리워 졌다. 이러한 기능은 유사-실험모델을 사용하여 예축한 자료를 근간으로 하여 직간접적으로 토양수분을 추정할 수 있다. Mathematical models have become increasingly popular in both research and management problems involving flow and transport processes in the subsurface. Rosetta is a program to estimate unsaturated hydraulic properties from surrogate soil data such as soil texture data and bulk density. Models of this type are called pedotransfer functions (PTFs) as an alternative measurements since they translate basic soil data into hydraulic properties. These functions may be either measured directly or estimated indirectly through prediction from more easily measured data based using quasi-empirical models.