• 한국유기농업학회지
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• 제25권1호
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• pp.71-84
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• 2017

두둑을 재활용한 무경운 재배 토양의 고추의 생육량은 관행경운 토양에 비하여 22% 정도 증가되었고, 무경운 3년차는 12% 정도 증가되었다. 무경운 재배 2년차 토양에서 생산된 풋고추 건물중은 $348.4kg10^{-1}$으로 관행 경운 토양에 비하여 16% 증가되었으나, 무경운 3년차는 감소되었다. 무경운 2년차 토양의 세균은 관행 경운 토양에 비하여 유의적인 증가를 보였으나, 무경운 3년차에서는 관행 경운 토양과 유의적인 차이가 없었다. 방선균도 경운 토양에 비하여 무경운 2년차 토양은 유의적인 증가를 보였으나 무경운 3년차는 감소되었다. 곰팡이는 경운토양에 비하여 무경운 2~3년차 토양에서 1.3~1.7배 정도 증가되었다. 무경운 재배 토양의 $CO_2$ 발생량은 경운재배 토양에 비하여 41% 수준으로 발생량이 현저하게 감소되었다. 고추 생육 초기 관행 경운 토양의 미소동물은 톡토기목과 응애목 2종 6개체가 포획되었으나, 무경운 1년차 토양에서는 지네강 등 5종 11개체가 포획되었고, 무경운 2년차는 딱정벌레와 지네강 등 3종 5개체가 포획되었다. 고추 정식 46일 후에 조사한 경운재배 토양은 보라톡토기 등 4종 40개체를 포함 큰집게벌레 등 8종 97개체가 포획되었다. 무경운 재배토양은 9~10종 101~107개체가 포획되었다. 지표생물로서 환경의 변화의 기준이 되는 자연도 점수는 관행경운양 19점에 비하여 무경운 토양의 자연도 점수는 33점으로 1.74배 정도 높았다. 따라서 두둑과 고랑을 재활용한 한국형 무경운 농업은 관행 경운토양에 비하여 작물의 생육과 토양 미생물, 토양 곤충을 포함한 토양생물 다양성, 온실가스 발생량 감소에 긍정적인 역할을 하는 것으로 판단되었다.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2002년도 학술발표회 발표논문집
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• pp.61-64
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• 2002

We constructed climagraphs for 16 regions of Korea by using the average monthly minimum air temperature, maximum air temperature and global radiation. We characterized the outside climate requirements corresponding to the climate requirements of crops in greenhouses. The climagraphs allow to decide the appropriate climate periods for greenhouse cultivation without heating and cooling equipment. These graphs may be used for analyzing climatic characteristic of a given area, selecting the suitable region and greenhouse and making a rational plan for greenhouse cropping in Korea. We found difficulty in deciding the beginning and end of greenhouse heating and cooling period due to insufficient references.

• 한국농공학회:학술대회논문집
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• 한국농공학회 1999년도 Proceedings of the 1999 Annual Conference The Korean Society of Agricutural Engineers
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• pp.418-423
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• 1999

This study was performed to find an efficient method to overcome extremely high temperature within greehhouse in summer season. The actual states of practical use for greenhouse in hot summer season were investigated. About 21.6% of the investigated greenhouse farms were no cultivation, and most greenhouse farms were cultivating under the very inferior environment . To examine thermal enviornment of greenhouse according to cooling or assistant cooling , greenhouses were treated with natural ventilation, shading, roof sprinkling , and evaporative cooling with air cool fan. Shading and operating air col fan showed a drop in temperature of 3.8∼4.2$^{\circ}C$ as compared with natural ventilation, and most greenhouse air temperatures were maintained below 35$^{\circ}C$.

• 한국생물환경조절학회:학술대회논문집
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• 한국생물환경조절학회 2003년도 춘계 학술대회 논문집
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• pp.203-206
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• 2003

우리나라 시설원예 면적은 '95년 43,093ha에서 '01년 말 현재 52,125ha로 연평균 3.2%의 증가율을 보인 반면 난방면적은 연평균 10.8%씩 증가하여 12,710ha로 전체 시설재배 면적의 24.4%를 차지하고 있다. 또한 난방연료의 95% 이상이 경유이며, 최근 국제정세 불안 등으로 유가가 급등하여 시설재배농가의 연료비 부담은 더욱 가중되고 있다. (중략)

• 한국생물환경조절학회:학술대회논문집
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• 한국생물환경조절학회 2003년도 추계학술대회 논문집
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• pp.187-191
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• 2003

• 한국농공학회논문집
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• 제63권4호
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• pp.13-21
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• 2021

The feasibility of HWS for agricultural use was analyzed through a crop cultivation test to utilize the hydroponic waste solution (HWS) generated from the nutriculture greenhouse. The fertilizing effect of HWS was assessed on the basis of the inorganic nitrogen (N) mostly existed in HWSs, and nitrogen (urea) fertilizer. Lettuce was selected as the target crop influenced by the soil treatment and also for the crop cultivation test. Thus, the change in growth characteristics of lettuce and that in chemical characteristics of the soil were investigated. In terms of the growth of lettuce, the C control group with 70% nitrogen (urea) fertilizer and 30% HWS and the D control group with 50% nitrogen (urea) fertilizer and 50% HWS were more effective than the practice control group (B) with 100% nitrogen (urea) fertilizer. The results of this study confirmed the combined applicability of the chemical fertilizer and HWS for crop cultivation. Because NO₃-N present in HWS has a high possibility of leaching into the soil, its applicability as a fertilizer has been considered to be relatively low in Korea. However, if an appropriate mixing ratio of urea fertilizer and HWS could be applied, the problems associated with leaching of nitrate nitrogen could be reduced with beneficial effects on crop cultivation. Thus, future studies are required on the treatment effect of HWS with repeated cultivation, impact assessment on the surrounding environment, and appropriate fertilization methods using nitrogen (urea) fertilizer and HWS. These studies would facilitate the sustainable recycling of HWS.

• 한국유기농업학회지
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• 제23권4호
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• pp.923-938
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• 2015

This study was conducted to serve as the basis for establishing a standard cultivation, which enhances the alternative utilization of pig manure, a major cause of environmental pollution, by finding a means for reducing greenhouse gas emissions for eco-friendly cultivation. In a laboratory, $CH_4$ and $CO_2$ emission patterns were investigated corresponding to incremental pig manure treatments in paddy soil. The emissions peaked 12 to 27 days after manure application in the 100~400% applications. It was found that increasing applications of pig manure resulted an increase in $CH_4$ and $CO_2$ emissions. Additionally, application of more than 150% emitted a larger amount of these gasses than applying chemical fertilizer. However, the test application of 100% pig manure emitted a smaller amount of $CH_4$ and hence Global Warming Potential (GWP) than those emitted by chemical fertilizer. If appropriate amount of fertilization is applied in compliance with the standard application rate, the pig manure may be effective in reducing greenhouse gas emissions and the soil environment made more favorable than with the use of chemical fertilizer.

• 농업과학연구
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• 제45권4호
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• pp.623-634
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• 2018

This experiment was conducted to determine the effects of the pre- and post-harvest variable factors on the processed product of kimchi cabbage. Two kimchi cabbage cultivars, namely 'Chungwang' and 'Dongpung,' were grown in a field and under a plastic greenhouse condition and stored at $5^{\circ}C$ after harvesting with and without low-density polyethylene (LDPE) film packaging. Growths were determined after harvesting while salting characteristics were determined after the processing and storage. The results show that the height, weight and leaf thickness were higher in kimchi cabbages grown in the greenhouse than those grown in the field. The plastic house culture increased the kimchi cabbage growth of the head weight, head height and leaf thickness compared with that of the open field culture. However, the osmolality and firmness were higher in the outdoor cultivated kimchi cabbages. Kimchi cabbage packed in film covered sacks and stored at $5^{\circ}C$ showed lower weight loss than unpacked cabbages during storage. Salt concentration and pH were also affected by the different pre- and post-harvest factors after salting the kimchi cabbages. Salt concentrations of the kimchi cabbage were influenced by various factors such as the cultivars, cultivation methods and storage covering. Though the present findings showed a limited difference in salt concentration and pH between the cultivars of kimchi cabbages, this study suggests that there is a relationship between processed agricultural products and their pre- and post-harvest methods.

• 한국버섯학회지
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• 제13권1호
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• pp.26-29
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• 2015

양송이는 재배사라는 밀폐된 환경에서 재배되는 바 양질의 생산을 위해서는 재배사 내 환경에 대한 정보가 요구된다. 본 연구는 양송이 재배사내 실내환경에 대한 기초 정보를 얻고자 수행되었다. 재배사 내 온도와 습도는 $19.75{\pm}0.35^{\circ}C$, $87{\pm}3.67%$로 세균이 서식할 수 있는 환경조건이었으며, 부유세균의 농도는 $3.84{\times}10^3cfu/m^3$로서 환경부에서 고시한 실내공기질 오염유지 기준치인 $8.0{\times}10^2cfu/m^3$을 초과하는 수치였다. 분리된 부유세균은 Advenella kashmirensis, Bacillus vietnamensism, B. licheniformis, Burkholderia sordidicola, Fictibacillus phosphorivorans, Lysobacter daejeonensis, Microbacterium esteraromaticum, Pseudomonas aeruginosa, P. protegens, P. gessardii, P. mosseli 등 7속 11종으로 동정되었다.

• 농촌계획
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• 제19권4호
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• pp.125-135
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• 2013

Analysis and evaluation of uncertainty is adopting the advanced methodology among the methods for greenhouse gas emission assessment that was defined in GPS2000 (Good practice guideline 2000) and GPG-LULUCF (GPG Land Use, Land-Use Change and Forestry). In 2006 IPCC guideline, two approaches are suggested to explain the uncertainty for each section with a national net emission and a prediction value on uncertainty as follows; 1) Spread sheet calculation based on the error propagation algorithm that was simplified with some assumptions, and 2) Monte carlo simulation that can be utilized in general purposes. There are few researches on the agricultural field including greenhouse gas emission that is generated from livestock and cultivation lands due to lack of information for statistic data, emission coefficient, and complicated emission formula. The main objective of this study is to suggest an evaluation method for the uncertainty of greenhouse gas emission in agricultural field by means of intercomparison of the prediction value on uncertainties which were estimated by spread sheet calculation and monte carlo simulation. A statistic analysis for probability density function for uncertainty of emission rate was carried out by targeting livestock intestinal fermentation, excrements treatment, and direct/indirect emission from agricultural lands and rice cultivation. It was suggested to minimize uncertainty by means of extraction of emission coefficient according to each targeting section.