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강창성,노안성,김성기,박경열 한국토양비료학회 2011 한국토양비료학회지 Vol.44 No.3
Livestock manure compost (LC) generally contains high content of phosphorus, therefore can be a substitute for phosphorus fertilizers. In this experiment of the cultivation of lettuce in green house, the possibility of LC as a subsitute for phosphorus fertilizer was investigated and the fertilizer efficiency of nitrogen and potassium in LC as compared with chemical N fertilizer (urea) and K fertilizer (potassium chloride) was examined. In proportion to the increase in the application rate of nitrogen fertilizer, soil pH declined, whereas EC and NO_3-N content became higher. The application of LC appeared to increase the soil content of organic matter,available phosphate, exchangeable calcium, magnesium and sodium more than that of chemical fertilizer. Supplementation of the K fertilizer by the lack amount from the application of LC resulted in the same exchangeable potassium content in soil with NPK plot in which N, P and K fertilizers were applied by the amount of soil test recommendation. The relationship between soil NO_3-N content and nitrogen application rate from fertilizer and compost showed as y=0.57717a+0.19760b+74.65 (R^2=0.6347) in which y is the soil NO_3-N content (mg kg^-1), a is nitrogen application rate from fertilizer and b is nitrogen application rate from compost (kg ha^-1), respectively. From this equation, the supply ability of NO_3-N into soil of LC exhibited about 34% (pig manure compost 37.0, chicken manure compost 34.7, cattle manure compost 23.3) of nitrogen fertilizer (urea).
코로나-19 상황에서 휴직 중인 카지노 종사원의 지각된 스트레스가 이직의도에 미치는 영향 - 고용불안정성의 매개효과와 사회적 자본의 조절효과를 중심으로 -
강창성,강주현 한양대학교 관광연구소 2022 觀光硏究論叢 Vol.34 No.3
본 연구는 코로나-19 상황에서의 지각된 스트레스가 고용불안정성과 이직의도에 미치는 영향을 확인하고 고용불안정성의 매개효과를 검증하고자 한다. 또한, 지각된 스트레스가 고용불안정성에 미치는 부정적인 영향을 완화시킬 수 있는 방안을 검증하고자 사회적 자본을 조절변수로 제시하였다. 설문은 휴직 중인 제주도 내 외국인 전용 카지노 종사원을 대상으로 온/오프라인으로 실시하였으며, 총 250부를 실증분석에 활용하였다. 지각된 스트레스는 고용불안정성에 정(+)의 영향을 미치는 것으로 나타났으며, 고용불안정성은 이직의도에 정(+)의 영향을 미치는 것으로 나타났다. 하지만, 지각된 스트레스와 이직의도 간의 직접적인 유의미한 영향이 나타나지 않아 고용불안정성의 완전 매개효과를 검증하였다. 조절효과 검증에서는 사회적 자본의 유의미한 조절효과가 검증되었다. 본 연구를 통해 코로나-19로 인해 발생한 종사원의 스트레스와 고용불안정성, 이직의도, 사회적 자본의 영향 관계를 규명함으로써 효율적인 인적자원관리를 위한 방안을 제시하였다.
강창성,노안성 한국토양비료학회 2012 한국토양비료학회지 Vol.45 No.1
To promote the practical use of livestock manure compost (LC) for paddy rice cultivation, the fertilization efficiency of nutrients in LCs was investigated compared to that of chemical fertilizer. This experiment was conducted at rice field in Hwaseong, Korea, with 6 treatments by each of 3 kinds of tested LCs, cattle manure compost (CaC), swine manure compost (SwC) and chicken manure compost (ChC). The treatments consisted of 3 application levels of LCs and 3 chemical fertilizer treatments having the same application levels with LCs. NH4-N content in soil became higher according to the increase in the urea application rate, while it became lower in LC plots than in urea plots, and statistically had no significant difference among LC plots. There was a close relationship between phosphate fertilization rate and the increment of soil available phosphate content after experiment resulting y = 0.1788x - 6.169 (R2 = 0.9425) when applied fused superphosphate fertilizer,and y = 0.0662x - 2.689 (R2 = 0.9315) when applied LC at the equivalent rates to phosphate input (x:phosphate application rate, kg ha-1, y: increment in soil available phosphate content, mg kg-1). And from these two equations, the correlation on the phosphate application rate between fused superphosphate fertilizer and LC could be obtained as y = 2.7056x - 52.492 (x: P2O5 application rate of fused superphosphate, kg ha-1, y:P2O5 application rate of LC, kg ha-1). Plant height, number of tillers, nutrients uptake by rice, and rice yield showed higher levels in N 100% and N 150% application plots of chemical fertilizers, while every LC plots exhibited lower values and no significant difference among them. Relative nitrogen fertilization efficiencies of LCs compared to urea was 12.3% for CaC, 8.8 for SwC and 24.6 for ChC, respectively.
강창성,노안성 한국토양비료학회 2011 한국토양비료학회지 Vol.44 No.2
This survey was conducted to promote the environment-friendly use and recycling of livestock feces by obtaining information about the current state of livestock feces composts manufactured in Gyeonggi Province. Therefore, some aspects of quality and manufacturing techniques of livestock feces composts (LFCs) were examined especially in relation to the LFCs quality standard (LQS). By surveying the 70 composting plants in Gyeonggi Province, the total commercial production of LFCs in 2008 was estimated to be about 480,000 Mg year-1 and they were manufactured mainly by using both mechanical mixer and bottom air blower. LFCs were composed mainly of chicken feces 29.2%, pig+chicken feces 23.1%, pig feces 20.0%, livestock feces+oil cake 12.3%, pig+chicken+cattle feces 10.8% and pig+cattle feces 4.6%. On the basis of the current official standard which was revised on March 2010, 11 composts out of surveyed 76 ones did not meet the LQS due to inadequate content of water (5), OM/N (1), NaCl (2) and Zn (3). The satisfaction rate to LQS by manufacturers was 100% in the composts produced by farmer’s cooperative societies, 80.7% by civil factories, and 44.4% by farming guilds, respectively. The OM/N declined by adding chicken feces and oil cake, while Ca content was increased by the addition of chicken feces and NaCl was increased by adding cattle feces.