• Korean Journal of Agricultural Science
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• v.25 no.1
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• pp.12-18
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• 1998

This study was conducted to examine the effect of several postharvest treatments on the storable quality of three apple cultivars, 'Tsugaru', 'jonagold', and 'Hokudo' which are difference in harvest season. Ethylene evolution level showed cultivar-dependent pattern during storage and there was no correlation between the amount of ethylene evolution and storage period among cultivars. Polyethylene film(PE) wrapping was effective in the inhibition of water loss and functional ceramic film was also effective in the prevention of ethylene accumulation inside the wrap during 1 to 3 months of cold storage compared to those of simple PE wrapping. Ethylene scrubber and wax treatment positively contributed to keep the fruit firmness 10% higher than that of control fruit during storage. Waxing enhanced the appearance of 'jonagold' even after simulated marketing period through inhibiting wax accumulation on the fruit surface.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.32 no.1
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• pp.97-102
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• 1987

The objective was to obtain the basic information for the changes of the alpha-acid content according to days after flowering. altitude and weather of Hoeongseong, Korea. The alpha-acid of hops reached the highest con-tent in sixty one days after flowering, and the optimum time for cone picking was noted as 11-15th August. The altitude for the highest alpha-acid content was 190-260m of Hoeongseong. The year-to-year variations in the alpha-acid content of hops were higher than the altitude variations. The higher alpha-acid content was associated with a higher temperature and more amounts of sunshine in late July. Alpha-acid content and yield had a significant positive correlation.

• Journal of Korean Society of Forest Science
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• v.105 no.4
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• pp.456-462
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• 2016

This study was conducted to analyze the effect of forest road network on accessibility and cost reduction for forest operations before and after forest road construction by investigating harvesting operations in 5 regional Forest Services (8 management planning districts). The results showed that the accessible operation area within 500 m from forest roads or public roads increased about 3.5 times after the forest road construction. The average cost reduction was 308,000 won/km/year. According to the results, forest road had a great effect on improvement of accessibility and reduction effect of forest operation cost. Therefore, the policy for expansion of forest road should be continued for preparing of effective harvesting system.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.50 no.spc1
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• pp.187-190
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• 2005

This study was conducted to investigate the plant growth and seed yield between rain-shelter plastic house and out-door cultivation, and analysed the effect of harvesting time on seed quality. In rain-shelter plastic house cultivation, emergence date was 3 days and flowering date was 8 days earlier than out-door cultivation. Seed yield of rain-shelter plastic house cultivation was increased $25\%$ compared to out-door cultivation and it's more beneficial than out door cultivation. The crude fat content was higher and seed was whiter and better quality in rain-shelter plastic house cultivation than out-door cultivation. In out-door cultivation, the crude fat content was steadily increased until 40 days after full bloom, but the seed color was getting dark which was harvested at 30 days after full bloom and the color was turn to the dark brown when the seed was harvested at 40 days after full bloom. Harvesting of safflower seed's quality is best between 20 days and 30 days after full bloom.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.40 no.6
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• pp.705-710
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• 1995

In order to find out the effect of rainfall at harvesting season on germination of malting barley, the seeds sampled from Cheju island and southern part of Korea were examined. The germination rate of seeds from Cheju island where rainfall was frequent at harvesting season, ranged from 46 to 71%, even though disease infection of the seeds was not that serious as would be expected. High sugar content of seed was resulted from the degradation of carbohydrates during the harvest season. From TZ test the rainfall - affected seeds were found to be highly viable but in the state of secondary dormancy. Results of cold germination test showed that the seeds were recovered from the secondary dormancy. Therefore, it was recommended that the seeds affected by the rainfall at harvesting season should be utilized after 12 months when the dormancy period terminated. The germination percent of the seeds was significantly enhanced by prechilling and / or 1 ppm gibberellic acid treatment. Different seed lots showed different rate of germination and the degree of dormancy.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2017.04a
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• pp.90-90
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• 2017

생력화를 위한 구기자의 수확 기계화는 열악한 수확작업환경을 쾌적한 작업환경으로 개선하고 노동력 감소, 생산비 절감을 할 수 있다. 관행 손 수확과 진동 고리형 수확기 방법보다 높은 작업 능률 향상으로 영농규모의 확대 촉진 및 안정적인 영농 구조를 구축하여 재배농가의 생산비를 절감하여 경쟁력을 높일 수 있으며, 기존 인력에 의존하였던 수확작업을 기계화함으로서 전업농 및 대단위 경작이 가능하게 함으로서 국내에서 생산한 양질의 구기자를 국민에게 안정적으로 제공할 수 있다. 따라서, 본 연구는 구기자 수확작업의 생력화를 위하여 개발 보급된 수목형의 재배법 특성을 분석하고 이를 토대로 타격장치를 적용한 보행형 구기자 수확기를 개발하는데 목적이 있다. 수목형 구기자나무의 분지에 착과되어 있는 숙과를 주행하면서 탈과 할 수 있는 탈과 장치를 제작하기 위하여 타격형 탈과 장치를 3D 모델링 작업(Inventor V.11, Autodesk, USA) 후 시작기를 제작, 구기자 수확 시작기는 주행부, 타격장치, 집과부, 분지유인부로 구성하였다. 구기자 수확 시작기의 최대 높이는 형태학적 특성을 토대로 타격봉의 높이를 900 mm 이하로 제한하였으며, 조향장치의 높이는 800 mm로 하였다. 주행부는 구기자 재식 조사결과를 이용하여 고랑 폭 1,500 mm 이하에서 자유롭게 전 후진 이동이 가능하고 경사로 등을 주행 시에도 안전성을 높이기 위해 자동브레이크 기능이 있으며 타격장치의 타격 봉은 알루미늄 재질로 지름 100 mm, 길이 400 mm로 설계 제작하였으며, 구기자 분지 타격 시 분지와 타격 봉이 수직 상태로 타격이 가능하도록 제작, 집과장치는 포장의 두둑, 고랑은 일괄 표준화가 되어 있지않아 청양구기자시험장에서 측정한 재배법을 바탕으로 설계된 수집부 프레임의 적용범위는 폭 450 mm, 길이 720 mm, 높이 1,500 mm를 집과 범위로 하여 설계 제작하였다. 타격 방식을 적용한 구기자 수확기 성능평가 결과 조숙기에 30초 이상의 탈과 시 87.5 % 이상 탈과는 어려울 것으로 판단되었으며, 성숙기에는 타격시간에 관계없이 92 %의 매우 우수한 탈과율이 나타났다. 성숙기의 주행속도 48 m/h 일 때 탈과율과 집과율은 89 %, 92 %로 나타났다.단위작업시간당 최대 수확 능력은 관행작업 2.9 kg/hr, 진동고리형 수확기 5.2 kg/hr, 타격방식을 적용한 구기자 수확기는 최소 7.6 kg/hr, 최대 24.1 kg/hr로 관행작업과 비교하여 주행속도와 시기별 최소 2.6배, 최대 8.3배의 작업 성능 차이가 나타났다. 재배양식에서는 기계화 수목형이 적합한 것으로 나타났고, 타격방식을 적용한 보행형 구기자 수확기를 이용하여 수형별 시간대별 수확성능을 시험한 결과 우수한 결과가 나타났다. 이에 따라 구기자 재배 농가에 기계화수목형 재배법을 보급하고 타격방식을 적용한 구기자 수확기를 이용하면 작업환경 개선과 노동력, 인건비 절감을 통한 영농규모의 확대 촉진 및 안정적인 영농 구조로 구기자 경쟁력 제고를 할 수 있을 것으로 판단되어진다.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.63 no.4
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• pp.322-330
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• 2018

The correlation between the nutritional composition of soybeans and whole soymilk palatability was investigated using nine soybean cultivars (Teagwangkong, Daewonkong, Saedanback, Jinpung, Daechan, Miso, Cheongmiin, Cheongja 3, and Socheongja). Physicochemical analysis of soybeans, showed that the protein and lipid contents were 37.7-46.0 and 15.2-20.9%, respectively. Unsaturated fatty acids were 81.1-84.8% of total fatty acids, of which linoleic acids was 49.7-56.8%. Total tocopherol was $243.5-361.3{\mu}g/g$ of extract, of which ${\gamma}$-tocopherol was $67.14-86.49{\mu}g/g$. Total isoflavone contents varied within cultivars from $495.4-1,443.8{\mu}g/g$ of extract. Daidzin and genistin were 252.1-556.0 and $241.8-730.7{\mu}g/g$, respectively, which were major isoflavones in soybeans. For the sensory evaluation, whole soymilk was made from nine soybean cultivars and 20 panels investigate its palatability. The Daechan cultivar had the highest (9.1), and Cheongmiin the lowest (5.6), overall palatability score. Interestingly, sensory results were strongly correlated with linoleic acid (0.746) and stearic acid (-0.716) content. In summary, the fatty acid composition of soybeans is the key factor in determining the palatability of whole soymilk. This study could be applied to determine the suitability of cultivars for soybean products, including whole soymilk.

• Journal of The Korean Society of Grassland and Forage Science
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• v.22 no.4
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• pp.241-246
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• 2002

Rye-hairy vetch mixture would be recommended fur produce higher yield and conserving soil environment. This experiment was conducted to investigate the effect of planting and harvest dates on quality and productivity of rye-hairy vetch mixture. Plant height of rye and hairy vetch was increased with delayed harvest dates, but it found that there was on significant difference among seeding dates. The dry matter(DM) content was increased with delayed harvest dates, and it showed 30% DM in mid-May. Crude protein(CP) content was decreased sharply from 17~18% in heading stage to 9~10% in flowering stage. The content of ADF(Acid detergent fiber) and NDF(Neutral detergent fiber) were increased with delayed harvest date, but IVDMD(In vitro dry matter digestibility) and TDN(Total digestible nutrient) were decreased. The change of dry matter yield was affected significantly by harvest date but was not by seeding time. The results of this experiments indicated that harvest in late-April would be recommended to produce the highest yield and quality if it is considered to cultivate com fur silage. Harvest in mid-May would be recommendable with the cultivation of early maturity silage corn or sorghum $\times$ sudangrass hybrids.

• Horticultural Science & Technology
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• v.31 no.5
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• pp.573-579
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• 2013

This study was conducted to investigate optimal harvesting stage and the effects on cut roses of Korean cultivar harvested at different stages. Cut roses are harvested at three different flowering stages. The optimal harvesting stage of cut roses was different depending on varieties. The vase life of standard type 'Pink Song' and spray type 'Peace One' was extended when they were harvested in one and three stages, respectively. The vase life was generally increased when the cut roses were pretreated with a solution containing 2% sucrose + $200mg{\cdot}L^{-1}$ aluminum sulfate + $200mg{\cdot}L^{-1}$ $Mg(NO_3)_2$ + $50mg{\cdot}L^{-1}$ $CaCl_2$ as compared to the control regardless of the harvesting stage. And this pretreatment solution improved the flower quality of cut roses bred in Korea. But the effects of pretreatment were varied depending on the harvesting stage.

• Journal of Mushroom
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• v.21 no.3
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• pp.185-189
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• 2023

This study was conducted to develop a renewable and sustainable bio-material to replace polystyrene (EPS) in fungal-mycelium-based composite using agricultural by-products. Four mushrooms (Ganoderma lucidum, Fomitella fraxinea, Phellinus linteus, and Schizophyllum commune) were cultured in an oak sawdust plus rice bran substrate to select the mushroom with the best growth. The mycelia of G. lucidum showed the best growth. To investigate the optimal mixing ratio with spent mushroom substrate (SM) and oak sawdust (OS), samples were prepared by mixing SM and OS at ratios of 50%:50%, 60%:40%, and 80%:20% (w/w). Each substrate was then inoculated with G. lucidum. G. lucidum showed the best mycelial growth of 140.0 mm in the substrate with SM and OS mixed at a 60%:40% ratio. It was also found that the substrate with SM and OS mixed at a 60%:40% ratio had the best handling properties. The compressive strength of mycelial materials inoculated with G. lucidum was in the range of 300-302 kgf mm^-1, and the materials were four times stronger than polystyrene materials. These results indicate that substrates comprising spent mushroom substrate mixed with oak sawdust can be successfully upcycled to mycelium-based composite materials using G. lucidum. This represents a sustainable approach.