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밭 토양에서 규산질비료 시용이 토양 환경에 미치는 영향
주진호 ( J. H. Joo ),이승빈 ( S. B. Lee ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2011 강원 농업생명환경연구 Vol.23 No.4
Application of silicate fertilizers is typically practiced to amend soil quality and improve rice productivity at the paddy field in Korea, and their effects are well-established. However, a little research on the effect of silicate fertilizers on soil and crop growth in upland soil was reported. Most of silicate fertilizers applied in Korea is slag-originated silicate fertilizer. Some water soluble silicate fertilizers are manufactured and commercially available. The objective of this study was to assess changes of soil chemical properties in potato-grown plots by applying slag-originated silicate fertilizer and water soluble silicate fertilizer. Field experiment was conducted on a silt loam paddy soil, where four levels of each silicate fertilizer were applied in soil at the rate of 0, 1, 2, 4 times of the recommended levels. Application of slag-originated silicate fertilizer increased soil pH, while no significant pH increase was occurred with the treatment of water soluble silicate fertilizers. Soil pH increased proportionally as slag-originated silicate fertilizer was applied. Available SiO2 contents also increased with the treatment of slag-originated silicate fertilizer. Exchangeable Ca, Mg and available phosphate contents in soil increased with application of slag-originated silicate fertilizer, while no significant increases for exchangeable Ca, Mg and available phosphate contents were shown with the application of soluble silicate fertilizer. Throughout this study, soil application of slag-originated silicate fertilizer enhanced soil chemical properties, while water soluble silicate fertilizer application in soil needs further study to better understand application method, application rate, type of water soluble silicate fertilizer, etc.
유재홍 ( J H Yoo ),심명용 ( M Y Shim ),이전규 ( J K Lee ),이영돈 ( Y D Lee ),주진호 ( J H Joo ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2015 강원 농업생명환경연구 Vol.27 No.3
Organic agriculture is holistic production management systems which promote and enhance agro ecosystem health, including biodiversity, biological cycles, and soil biological activity. The Codex guidelines have been prepared for the purpose of providing an agreed approach for the requirements which underpin production of the labelling and claims for, organically produced foods. These guidelines set out the principles of organic production at farm, preparation, storage, transport, labelling and marketing stages, and provides an indication of accepted permitted inputs for soil fertilizing and conditioning, plant pest and disease control and, food additives and processing aids. Any substances used in an organic farming system for soil fertilization and conditioning, pest and disease control should comply with the relevant national regulations. The permitted substances for organic agriculture according to Environmental friendly Agriculture Promotion Act in Korea are 43 substances for use in soil fertilizing and conditioning and 42 substances for plant pest and disease control.
상토 소독방법에 따른 재사용 상토에서의 묘삼생육특성 및 미생물상 변화
이광재 ( K J Lee ),정혜정 ( H J Jung ),정햇님 ( H N Jeong ),김성일 ( S I Kim ),안문섭 ( M S Ahn ),주진호 ( J H Joo ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2015 강원 농업생명환경연구 Vol.27 No.1
묘삼 안정생산 및 비용절감을 위한 상토 재활용 가능성을 확인하고자 토양훈증제와 고압멸균법을 이용하여 상토를 소독 후, 소독방법에 따른 묘삼 재배 시 상토내 미생물상 변화와 묘삼 생육특성을 비교하였다. 엽장, 엽폭, 근장 및 근경 등 묘삼 생육특성은 증기 및 약제소독 처리구에서 무처리구에 비해 우수한 것으로 나타났으며, 상토 소독처리에 의해 잘록병 및 근부병 발생이 감소함을 확인하였다. 묘삼 재배 전후의 상토 내 미생물상 조사 결과, 세균류는 처리구간에 큰 차이를 나타내지 않았으나, 진균류와 피시움균은 소독 처리한 상 토에서 묘삼 재배 후 각각 0.3 ± 0.2×103 CFU/g medium, 1.6 ± 0.1×103 CFU/g medium 및 0.7 ± 0.1×103 CFU/g medium, 2.4 ± 0.3×103 CFU/g medium으로 조사되었으며, 이는 묘삼 모잘록병 및 근부병 발생율이 무처리구에 비해 낮은 시험결과와 일치하였다. 실험 결과와 같이, 증기 또는 약제를 이용한 상토 소독을 통해 상토 구입비용 절감 및 토양병원균에 의한 인삼 연작피해 경감에 도움이 될 것으로 사료된다. This study was carried out to develop the reuse method of ginseng seedling medium for safe production of ginseng seedling and saving cost. The leaf length, leaf diameter, root length and root diameter of ginseng seedling at the medium sterilized by steam or dazomet were superior to control group. Moreover, disease incidences of damping-off and root rot were decreased at sterilized medium than control, and the densities of fungus and pythium sp. after cultivation of ginseng seedling at the medium sterilized by steam or dazomet were 0.3 ± 0.2×103 CFU/g medium, 1.6 ± 0.1×103 CFU/g medium and 0.7 ± 0.1×103 CFU/g medium, 2.4 ± 0.3×103 CFU/g medium, respectively. These results suggested that sterilization of medium using by steam or chemical could be used as proper method for reuse of ginseng seedling medium.
$MgB_2$ bulk의 미세구조와 임계전류밀도에 미치는 polyacrylic acid doping 효과
이승묵,황수민,이창민,주진호,김찬중,Lee, S.M.,Hwang, S.M.,Lee, C.M.,Joo, J.,Kim, C.J. 한국초전도학회 2010 Progress in superconductivity Vol.11 No.2
We fabricated the polyacrylic acid (PAA)-doped $MgB_2$ bulks and characterized their lattice parameters, actual C substitutions, microstructures, and critical properties. The boron (B) powder was mixed with PAA using N,N-dimethylformamide as solvent and then the solution was dried out at $200^{\circ}C$ and crushed. The C treated B powder and magnesium powder were mixed and compacted by uniaxial pressing at 500 MPa, followed by sintering at $900^{\circ}C$ for 1 h in high purity Ar atmosphere. We observed that the PAA doping increased the MgO amount but decreased the grain size, a-axis lattice constant, and critical temperature ($T_c$), which is indicative of the C substitution for B sites in $MgB_2$. In addition, the critical current density ($J_c$) at high magnetic field was significantly improved with increasing PAA addition: at 5 K and 6.6 T, the $J_c$ of 7 wt% PAA-doped sample was $6.39\;{\times}\;10^3\;A/cm^2$ which was approximately 6-fold higher than that of the pure sample ($1.04\;{\times}\;10^3\;A/cm^2$). This improvement was probably due to the C substitution and the refinement of grain size by PAA doping, suggesting that PAA is an effective dopant in improving $J_c$(B) performance of $MgB_2$.
하홍수,김호겸,고락길,김호섭,송규정,박찬,유상임,주진호,문승현,Ha H. S,Kim H. K,Ko R. K,Kim H. S,Song K. J,Park C,Yoo S. I,Joo J. H,Moon S. H 한국초전도학회 2004 Progress in superconductivity Vol.6 No.1
Ni alloy tape is electropolished to be used as a metal substrate for fabrication of IBAD (ion-Beam Assisted Deposition)-MgO texture template fur HTS coated conductor. Electropolishing is needed to obtain a very smooth surface of Ni alloy tape because the in-plane texture of templates is sensitive to the roughness of metal substrate. The critical current of YBCO coated conductor depends on the texture of YBCO that depends on the texture of the IBAD MgO layer. And so the smoothness of the metal substrate is directly related to the superconducting properties of the coated conductor. In this study, we have prepared a reel-to-reel electropolishing apparatus to polish the Ni alloy tapes for IBAD. Various electropolishing conditions were investigated to improve the surface roughness. Hastelloy tape is continuously electropolished with high polishing current density (0.5 ∼ 2 A/$\textrm{cm}^2$) and fast processing time (1 ∼ 3 min). Polished hastelloy tapes have surface roughness(RMS) of below 1 nm on a 5 ${\times}$ 5 $\mu\m^2$ from AFM and SEM.