• 한국작물학회지
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• 제40권2호
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• pp.150-156
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• 1995

파종시기는 작물의 월동율에 가장 중요한 영향을 미치는데, 본 실험은 케놀라의 파종시기에 따른 내동성의 증가형태 및 이러한 내동성이 궁극적으로 월동율에 미치는 영향을 구명하기 위하여 수행되었다. 여섯 가지의 케놀라 품종을 8워 25일, 9월 10일과 9월 25일의 세 파종시기로 구분하여 포장에 파종하였으며, 파종 후 15일 간격으로 11월 중순까지 잎 표본을 채취하여 실험실에서 elec-troleakage test 법에 의하여 내동성을 측정하였으며, 월동율은 포장상태에서 가을과 봄에 걸쳐 살아있는 개체수를 세어서 산정하였는 바 그 결과는 다음과 같았다. 1. 내동성이 증가하는 형태는 파종시기에 따른 양태를 보였는데, 일찍 파종할수록 생육기 전반에 있어서 내동성의 증가가 일어나지 않는 반면 일찍 파종한 구에서는 꾸준한 증가세를 유지하였는데 이는 식물체의 생장정도에 따라 저온에 반응하여 내동성을 증가시키는 능력에 차이가 있는 것에 기인된다고 생각된다. 2. 세 파종시기에 있어서 공히 내동성의 급격한 증가를 보이는 기간은 기온이 케놀라의 저온적응에 알맞은 2∼5일 때임을 미루어 볼 때 식물체의 저온적응에 영향을 미치는 여러 가지 환경요인 중 저온의 중요성을 시사한다고 하겠다. 3. 내동성과 월동율은 긴밀한 상관관계를 보였으며, 이는 내동성이 월동율을 결정하는데 있어서 가장 중요한 요인의 하나이며 이러한 실내에서의 내동성측정이 월동율 향상을 위한 육종도구로 쓰일 수 있는 가능성을 확인할 수 있었다.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 2000년도 THE THIRD INTERNATIONAL CONFERENCE ON AGRICULTURAL MACHINERY ENGINEERING. V.III
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• pp.613-622
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• 2000

Watering operation for oyster mushroom growing houses is regarded as drudgery and time consuming farm operation for growers. Most of mushroom growing beds in oyster mushroom growing houses are designed as two-row with four floor beds, therefore the watering and ventilation between the bed floors are much difficult for farmers because of its structural design. The study aimed to reduce the watering operation and improve the mushroom growing environment through the humidification and air supply on mushroom growing beds. Results showed that appropriate size of nozzle is between 0.8~0.5ml/s for the humidification and higher than the 2.0ml/s for the watering. The optimum water supply pressure was regarded as between 1.0~2.0MPa and the uniform distribution of droplet on the bed showed on air flow speed of 14m/s. The prototype was equipped with twin nozzle with. the humidification nozzle of 0.85ml/s and watering nozzle of 5.0ml/s, and the air blast fan with the air speed of 10m/sec in each air spout. In the field test in a practical scale mushroom growing house, it was well operated dependant on the set desire by a electric control unit. The machine can be practically used as air blast watering and air blast humidification for oyster mushroom growing farms without manual.

• 한국토양비료학회지
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• 제50권3호
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• pp.150-161
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• 2017

This study was conducted with the data of monitoring on soil chemical properties of rice paddy soils in Gyeongbuk Province. The selected soil chemical properties were analyzed every 4 year from 1999 to 2015. The soil pH measured in 2015 was higher than pH 6.0, which was 0.3-0.4 pH unit higher than data until 2007 survey year. The mean content of organic matter was greater than $24g\;kg^{-1}$ since 2003, but 35% of soil samples remained below the recommended level ($20-30g\;kg^{-1}$) in 2015. The mean concentration of available phosphate was maintained at $40mg\;kg^{-1}$ higher than the upper recommendation level ($80-120mg\;kg^{-1}$), and more than 40% of paddy soils tested were found to have less than the recommendation level during the survey period. The exchangeable K concentration ranged from 0.25 to $0.39cmol_c\;kg^{-1}$. Exchangeable Ca showed an average at the optimum range ($5.0-6.0cmol_c\;kg^{-1}$) during the monitoring period. Exchangeable Mg decreased linearly ($0.02cmol_c\;kg^{-1}\;year^{-1}$) from $1.55cmol_c\;kg^{-1}$ as of 1999 to below the lower level of the recommendation range ($1.5-2.0cmol_c\;kg^{-1}$). The amount of available $SiO_2$ was increased significantly from 2011 to over the recommendation level (${\geq}157mg\;kg^{-1}$). It was revealed that the soil chemical properties of rice paddy fields was influenced by topology, soil texture, type and region as result of principal component analysis or cluster analysis. Therefore, an assessment on chemical properties of rice paddy soils should be performed to consider various soil physical conditions and agronomic practices such as fertilization, cropping system, and so on. Because of the high variability of nutrient levels across Gyeongbuk Province, nutrient management based on soil fertility test is required by respective farm land unit.

• Reproductive and Developmental Biology
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• 제35권3호
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• pp.395-398
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• 2011

The objective of this study was to compare the accuracy analysis and the effect of field application of a newly developed automatic heat detector in dairy cows. From 2009 to 2010, we used 48 Holstein cows (mounting cows : 38 heads, standing cows : 10 heads) raised in experimental barn of National Livestock Research Institute (RDA) for the accuracy analysis of automatic heat detector, and 14 Holstein cows raised in three commercial dairy farms of Cheonan and Pochun area for comparison of the effect of field application. The accuracy of response in cows attached with automatic heat detector was 86.8% (33/38) displayed on board when mounting activity observed, and 100% (10/10) when standing activity observed, and on average, 90.0% (43/48) displayed on board. The accuracy of automatic heat detector in on-farm test was 85.7% (12/14), and conception rate was 75.0% (9/12).

• 식물병연구
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• 제9권4호
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• pp.221-223
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• 2003

2002년 경상남도농업기술원 함양약초시험 포장에 재배중인 꽃범의꼬리에서 이상증상이 발생하였다. 병징은 지제부의 줄기가 수침상으로 물러지고 부패하면서 암갈색으로 변하고 그 위에 흰색의 곰팡이가 솜털처럼 생기고, 병반 부위와 토양 표면에 갈색의 둥근 균핵이 많이 형성된다. 병원균의 균사생장 및 균핵형성은 PDA배지에 배양시 $30^{\circ}C$에서 가장 양호하였다. 균핵은 갈색 또는 암갈색으로 크기는 1${\sim}$3 mm이었다. 균사 특유의 clamp connection이 관찰되었고 균사 폭은 3.6${\sim}$9.4 ${\mu}m$이었다. 본 병원균을 Sclerotium rolfsii로 동정하였으며 꽃범의꼬리 흰비단병으로 명명할 것을 제안한다.

• Animal Bioscience
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• 제36권5호
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• pp.731-739
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• 2023

Objective: This study was to evaluate the interaction of three different light-emitting diode (LED) light colors (white, green, and blue) and three intensities (5, 10, and 15 lx) on slaughter performance, meat quality and serum antioxidant capacity of broilers raised in three-layer cages. Methods: A total of 648 (8-days-old) male broiler chicks (Cobb-500) were randomly assigned in 3×3 factorially arranged treatments: three light colors (specifically, white, blue, and green) and three light intensities (namely, 5, 10, and 15 lx) for 35 days. Each treatment consisted of 6 replicates of 12 chicks. The test lasted for 35 days. Results: The semi-eviscerated weight percentage (SEWP) in 5 lx white was higher than that in 15 lx (p<0.01). The eviscerated weight percentage (EWP) (p<0.05) and water-loss percentage (WLP) (p<0.01) decreased in 10 lx white light than those in green light. Under blue light, the content of hypoxanthine (Hx) in muscle was lower than that under white and green light (p<0.01). The content of malondialdehyde (MDA) in 15 lx blue light was higher than that in 10 lx green light (p<0.05). Light color had an extremely significant effect on thigh muscle percentage, WLP, Hx, and crude protein content (p<0.01). Light intensity had a significant effect on SEWP (p<0.05), EWP (p<0.05), lightness (L^*) value (p<0.05), WLP (p<0.01), and the contents of superoxide dismutase (p<0.05), MDA (p<0.01), glutathione peroxidase (p<0.01). Conclusion: Using white LED light with 10 lx light intensity can significantly improve the chicken quality of caged Cobb broilers, improve the content of inosine acid in chicken breast and enhance the antioxidant capacity of the body. We suggest that the broiler farm can use 10 lx white LED light source for lighting in 8 to 42 days.

• 한국농공학회지
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• 제35권2호
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• pp.92-103
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• 1993

A sunday system with a horizontal bin-type composter was constructed and operated to evaluate its composting performance for four days for each test in October, 1992. A sundry system is one of popular systems for composting livestock manure, of which main benefit is to utilize unlimited, clean, and free solar radiation. A rectangular concrete bin(composter) with dimension of 300cm(length) X90cm(width) X60cm(height) was bedded alternatively with four lanes of aeration pipes and heating pipes, and was insulated at three walls with 50mm styrofoam. Each aeration pipe of a diameter of 25mm had 4mm perforated holes at every 15cm longitudinally, and supplied air of about 2m$^3$/min to the composter to maintain aerobic condition . A stirrer rotating at 1 rpm made one round trip every 20 minutes on the conveying chain along the the length of the composter. Five tests (Test 1~Test 5) were implemented to evaluate the composting effectiveness of a sundry system with a horizontal bin-type composter. Treatments of two levels of the mixture ratio of swine manure and paper sludge cakes(manure : paper sludge cakes= 1 : 4 and 1 : 2) and two levels of the water content(W/C ; 70% and 50%) were made to test the significance of the physicochemical properties for decomposition of the mixture materials. Temperature, C/N ratio, water content, microbial activity of the composting materials were taken measurements to evaluate its performance with the lapse of composting time for tests. A small-scale sundry system with a bin-type composter did not appear to be an appropriate system for composting livestock manure. Since heat generation by the composting materials could not overcome heat loss due to areation in a small-scale composter, a proper thermal enviroment could not be maintained to propagate massively thermopilic microorganism relatively in a short period of time. Different from the result of Chol et al.(1992) 6), a temperature variation of the composting materials did not show the peak clearly and C/N ratio didn't lower with time as expected. Mesophilic microoragnism seemed to play an important role for decomposition of the mixture materials. A sundry system with a bin-type composter may be good for a large-scale livestock farm household which may produce enough animal manure. Therefore a decision should be made very carefully to choose a system for composting livestock waste.

• 농촌의학ㆍ지역보건
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• 제44권2호
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• pp.82-89
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• 2019

목적 : 이번 연구는 인수공통감염병의 고위험군인 사슴농가 종사자를 대상으로 라임병의 감염 실태 파악 및 위험요인 분석을 위해 수행하였다. 대상 및 방법 : 전국 시 군 지역의 사슴농가를 중심으로 516명에 대해 설문조사 및 혈청검사를 실시하였다. 라임병 진단방법은 IFA(Indirect Immunofluorescence antibody Assay, 간접면역형광항체법)와 IFA검사의 높은 위양성률을 보완하기 위해 ELISA 검사 그리고 Western Blot 법을 이용하였다. 결과 : 전국 사슴농가 종사자 516명의 라임병 최종 혈청 유병률은 2.3%이었으며, 엘크 (Cervus Canadensis)만을 기르는 사슴 농가 종사자의 라임병 혈청유병률이 3.6%로 다른 종류의 사슴을 키우는 사슴 농가 종사자보다 라임병 발병 위험이 통계적으로 유의하게 높았다(p = 0.033). 결론 : 국내 사슴농가 종사자들이 인수공통감염병인 라임병에 노출되어 있음을 확인하였고, 키우는 사슴의 종류나 작업 행태, 보호복 착용 여부 등에 따라 라임병 노출의 가능성이 다름을 확인할 수 있었다.

• 농촌계획
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• 제19권2호
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• pp.1-10
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• 2013

This study is intended to examine the perception of importance-satisfaction in selective properties of rural theme park with the users and to suggest operation method and implications for rural theme parks which are being built on a nation-wide basis. The study results are as follows: First, the results from the analysis on importance-satisfaction in the selective properties showed that both attractiveness of natural landscape and excellence of surrounding environment are high. Second, the t-test with matched samples for importance-satisfaction showed that there were significant statistical differences in all items, and the users rated satisfaction lower than the importance. Third, IPA results showed that the items such as diversity of festival event, accessibility and convenience of public transportation, appropriateness of expense and kindness in service appeared in the 2nd quadrant 'direction of concentrated efforts'Therefore, this study was able to identify the perception of importance-satisfaction among the users of rural theme parks. The study findings suggest that it is necessary to preserve surrounding natural environment, ensure appropriate pricing, introduce events and increase service level in constructing and operating rural theme parks.

• 한국농공학회논문집
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• 제58권6호
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• pp.1-8
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• 2016

Crop damages due to agricultural drought has been increased in recent years. In Korea, water resources are limited indicating that proper management plans against agricultural drought are required for better water-use efficiency in agriculture. In this study, irrigation intervals and amounts for various crops and soil physical properties (sandy and silt loams) were estimated using the IWMM model. Five different crops (soybean, radish, potato, barley and maize) at the Bangdong-ri site in Chuncheon were selected to test the IWMM model. IWMM assessed agricultural drought conditions using the soil moisture deficit index (SMDI), and irrigation intervals and amounts were determined based on the degree of agricultural drought (SMDI). Additionally, we tested the effects of surface irrigation and sprinkler irrigation methods and various irrigation intervals of 2, 3, 5 and 7 days. In our findings, the irrigation intervals of 5 and 7 days showed the minimum rrigation amounts than others. When we considered that the intervals of 3 or 5 days are usually preferred to fields, the interval of 5 days was determined in our study. The estimated irrigation amounts for different crops were shown as maize > radish > barley > soybean > potato, respectively. The irrigation amounts for maize and barley were highly affected by soil properties, but other crops have less differences. Also, small differences in irrigation amounts were shown between the surface and sprinkler irrigation methods. These might be due to the lack of consideration of water loss (e.g., evapotranspiration, infiltration, etc.) in IWMM indicating model structural uncertainties. Thus, possible water loss (e.g., evapotranspiration, infiltration) need to be considered in application to fields. Overall, IWMM performed well in determining the irrigation intervals and amounts based on the degree of agricultural drought conditions (SMDI). Thus, the IWMM model can be useful for efficient agricultural water resources management in regions at where available water resources are limited.