• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2004년도 추계학술대회
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• pp.96-98
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• 2004

At the previous papers, we showed that K2O-CaO-P2O5 glasses had a solubility in air so that they could be used for glass fertilizer. In this work, we fabricated the Eco-glass fertilizer containing trace elements such as B, Mg, Zn, Fe, Cu, Co, and Mo by a melt-quenching process and the dissolution properties of these glasses were investigated with pH meter and ICP analyzer. In case of the glasses containing the trace elements, effect of trace elements on the dissolutions is not obvious and ignorant the stability of mother glass. Also, the dissolution amounts of each trace elements depend on the mother glass composition and the quantity of each trace element, and mother glasses determined the dissolving velocity of chemical elements.

• 한국세라믹학회지
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• 제42권6호
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• pp.371-376
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• 2005

Phosphate glasses were prepared by melting quenching process, and glass formation and dissolution properties were studied. The glass forming region in the $K_2O-CaO-P_2O_5$ system is quietly agreed with the report by Mazurin OV et al. with $M_2O-M'O-P_2O_5$ system (M : monovalent cation, M'divalent cation). Conditionally these glasses have solubility from absorbing the moisture or water and then release elements with trace elements, and the thermal and chemical properties were controllable by the $CaO,\;K_2O,\;P_2O_5$ contents. In the abnormal glass properties, this paper showed the possibility the present glasses can be a good candidate for one component of the slow released agriculture fertilizer.

• 한국산학기술학회논문지
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• 제6권2호
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• pp.144-148
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• 2005

앞선 논문에서 ${K_2}O$-CaO-${P_2}{O_5}$유리의 용출 특성을 이용한 유리질 비료로서의 가능성을 보고한바 있으며, 본 연구에서는 ${K_2}O$-CaO-${P_2}{O_5}$ 조성에 식물의 성장에 필요한 미량원소인 B, Mg, Zn, Fe, Cu, Co, Mo을 첨가한 유리를 제조하였으며, 제조된 유리의 용출 특성을 pH와 ICP분석을 통하여 관찰하였다 미량원소가 첨가된 유리의 경우 첨가전의 pH값의 변화와 차이가 없었으며, 모유리의 안정화에 영향을 미치지 못함을 알 수 있었다. 첨가된 미량원소의 용출량은 모유리조성과 첨가된 함량에 비례하였으며, 이러한 원소들의 용출속도는 모유리 조성에 의하여 결정되었다.

• 한국세라믹학회지
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• 제40권11호
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• pp.1132-1137
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• 2003

환경친화적인 유리비료로서의 응용을 위해 인산염계 유리의 용출특성에 대한 연구를 진행하였다. 0.1K₂O-0.1SiO₂-0.6P₂O/sub 5/계 유리를 기본조성으로 하고, CaO와 MgO의 함량변화를 준 다양한 유리조성에 대한 유리 형성 조건을 확인하고자 하였다. 또한 CaO 및 MgO의 함량변화에 따른 열적특성 및 용출 특성 변화를 확인하였다. MgO 함량의 증가에 따라 유리 전이온도 및 연화온도는 증가하였으며, CaO 및 MgO의 함량변화에 따라 용출특성에 큰 영향을 미치는 것을 확인하였다.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2005년도 추계학술발표회 요지
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• pp.176-177
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• 2005

• 한국재료학회지
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• 제14권1호
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• pp.67-72
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• 2004

The glass-forming conditions are investigated in the $K_2$O-CaO-$SiO_2$ $-P_2$$O_{5}$ system with 10~65 mole% of$ P_2$$O_{5}$. Thermal properties and dissolution properties were investigated according to variation of the SiO and KO contents in selected compositions. The glass formation condition was determined when $K_2$O/$P_2$$O_{5}$ mole ratio 0~0.24, $SiO_2$/($SiO_2$+$P_2$$O_{5}$ ) mole ratio 0～0.29, and CaO/$P_2$$O_{5}$ mole ratio 0~1.00. In the result of the thermal properties, the glass transition temperature($T_{g}$) and softening temperature($T_{s}$ ) were gradually shifted to the lower temperature range with increase of $K_2$O contents. The maximum value of the chemical durability was shown in $K_2$$PO_2$$O_{5}$ mole ratio 0.17 when the $SiO_2$ contents were changed, and $K_2$O was fixed at 10 mole%. Hence the change of the $K_2$O/$P_2$$O_{5}$ mole ratio was found that a new main factor of the chemical durability.

• 한국유기농업학회지
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• 제4권2호
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• pp.97-136
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• 1995

Recendtly an organic agricultured in Korea is getting a public attention not only for minimizing NO3- contamination of groundwater but also for producing of quility of agricultural products. But still there is not Basic Standards for Organic Agriculture in Korea and Japan since they just believe organic agriculture is one kind of the environmental friendly sustainable agriculture as written in western literature. In the paper it was discussed the core skills and doctrine of IFOAM Basic Standards compare to Korean Organic Farming Method in oder to point out thed disadvantages of overuse of organic fertilizer, 50-150MT/㏊ in each cultivation, intensive monocropping in glass-house without any rotation & legume, and without any green manure. Most korean or-ganic farmer believe that the more they apply organic fertilizer, the better they pro-duce high quility of crops and they practise organic agriculture completely. It was also suggested the overuse of organic fertilizer cause the accumulation of NO3- in rhizosphere and subsequently it might lead to drinkwater pollution by nitrate leaching. In conclusion it is suggested that for successful establishment of organic agriculture, The Association of Korean Organic Agriculture, The Society of Korean Organic Agri-culture and the certification body should be developed the Basic Standards which is acceptable by IFOAM Basic Standards.

• 한국생물물리학회:학술대회논문집
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• 한국생물물리학회 2002년도 제9회 학술 발표회 프로그램과 논문초록
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• pp.42-42
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• 2002

Salt accumulation in agricultural soils reduces the growth and productivity of crops. Although scientists have been studied the impacts of salinity on plants, the physiological mechanism of adaptation to salinity has not been well understood. Practically, salinity in irrigated soil of green and glass houses keeps increasing in Korea by the massive application of nitrogen fertilizer.(omitted)

• 한국환경농학회지
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• 제41권4호
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• pp.230-235
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• 2022

BACKGROUND: Ammonia gas emitted from nitrogen fertilizers applied in agricultural land is an environmental pollutant that catalyzes the formation of fine particulate matter (PM2.5). A significant portion (12-18%) of nitrogen fertilizer input for crop cultivation is emitted to the atmosphere as ammonia gas, a loss form of nitrogen fertilizer in agricultural land. The widely practiced method for fertilizer use in agricultural fields involves spraying the fertilizers on the surface of farmlands and mixing those with the soils through such means as rotary work. To test the potential reduction of ammonia emission by nitrogen fertilizers from the soil surface, we have added N, P, and K at 2 g each to the glass greenhouse soil, and the ammonia emission was analyzed. METHODS AND RESULTS: The treatment consisted of non-fertilization, surface spray (conventional fertilization), and soil depth spray at 10, 15, 20, 25, and 30 cm. Ammonia was collected using a self-manufactured vertical wind tunnel chamber, and it was quantified by the indophenol-blue method. As a result of analyzing ammonia emission after fertilizer treatments by soil depth, ammonia was emitted by the surface spray treatment immediately after spraying the fertilizer in the paddy soil, with no ammonia emission occurring at a soil depth of 10 cm to 30 cm. In the upland soil, ammonia was emitted by the surface spray treatment after 2 days of treatment, and there was no ammonia emission at a soil depth of 15 cm to 30 cm. Lettuce and Chinese cabbage treated with fertilizer at depths of 20 cm and 30 cm showed increases of fresh weight and nutrient and potassium contents. CONCLUSION(S): In conclusion, rather than the current fertilization method of spraying and mixing the fertilizers on the soil surface, deep placement of the nitrogen fertilizer in the soil at 10 cm or more in paddy fields and 15 cm or more in upland fields was considered as a better fertilization method to reduce ammonia emission.

• 한국토양비료학회지
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• 제43권3호
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• pp.322-328
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• 2010

This study was initiated to investigate the physical and chemical properties of the clay mineral illite and its effect on the growth of cherry tomato (Hongjak) as affected by the forms and concentrations of illite using the bed soil in the glass house. The composition of illite was analyzed by SEM(scanning electron microscope). The cherry tomato was cultivated in the bed soil in the glass house at Chungbuk National University for 10 weeks of total duration. The application rates of illite used as particulate and powder forms were standard 1:20 (w/w), two times 1:10 (w/w), four times 1:5 (w/w) of standard application, respectively. The surface of illite used in the study appeared to be hexagonal sheet and it included K and the variety of other elements. The growth lengths of cherry tomato were 11-23% greater in the pots treated than in the untreated pots. Based on the analyses of the major cations, K, Ca, and Mg from the cherry tomato the amounts of K taken in the leaf and stem of the cherry tomato were 8-45% and 3-30% greater than untreated pots, respectively. The amount of Ca in the leaf and stem taken up by the cherry tomato were 6-39% and 11-40% greater than untreated pots, respectively. The amounts of Mg in the leaf and stem taken up by the cherry tomato were 17-62% and 19-54% greater than untreated pots, respectively. Based on the analysis for the amount of cations, such as K, Ca, and Mg taken up by cherry tomato in treated and untreated bed soil, it appears that the illite treatment enhanced the early growth of cherry tomato.