• Journal of Mushroom
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• v.21 no.3
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• pp.167-172
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• 2023

A new brown variety of Flammulina velutipes, referred to as 'Asakgold,' was bred by crossing two monokaryons isolated from the "Geumhyang2ho" and "Garlmoe" varieties. The pileus color of the new variety is light brown and its shape is hemispherical. During bottle cultivation, the period necessary for mycelial growth was 40 days, 9 days for primordia formation and 15 days for fruiting body growth. The total cultivation period was 64 days, which was similar to that of the control variety "Yeoreumhyang1ho." The pileus of the new variety was similar and the stipe was thinner and longer than that of the control. The number of valid stipes per bottle was 495, which was 37 % higher than that of the control (362), and the yield was 214 g, 16 % higher than that of the control (185 g). The β-glucan content was 28.69 %, which was observed to be 1.6 times more than that of the control.

• Journal of Mushroom
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• v.6 no.1
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• pp.13-19
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• 2008

This experiment was carried out to examine physiological and cultural characteristics of two strains ASI 19003, 'Poplar field-cap mushroom' Agrocybe cylindracea, and ASI 19016, 'Chaxingo' A. chaxingu, at the bottle cultivation which have very similar morphological characteristics in genus Agrocybe. There was significant difference between the physiological and cultural characteristics of ASI19003 and ASI19016. The optimal temperature for the hyphal growth was $28^{\circ}C$ in the strain ASI19003 and $30^{\circ}C$ in ASI19016. The optimal pH was not different in two strains and these strains grew well at pH 5.5~7.0. But the optimal pH in the submerged culture was 5.5 in ASI19003 and 5.0 in ASI19016. Especially, hyphal growth of the strain ASI19016 was very poor at pH 6.0~7.3. The optimal carbon source for the growth was lactose in the strain ASI19003 and fructose in ASI19016, and nitrate sources were asparagine, alanine, and glycine in the strain ASI19003, and ammonium tartrate, asparagine, glycine, and alanine in ASI19016, respectively. The periods of incubation and fruiting body formation in the bottle cultivation during the spring were 27 and 13 days in the strain ASI19003, 29 and 17 days in ASI19016. The yields of fruit body were 114 g per bottle (850 $m{\ell}$ volume) in the strain ASI19003 and 100 g in ASI19016. In the summer, the periods of hyphal incubation and fruiting body formation were 29 and 11 days in the strain ASI19003, 30 and 12 days in ASI19016. The color of the cap in the ASI19003 strain according to temperature increase during the fruit body development become more pale, but the strain ASI19016 kept dark color relative to ASI19003. The fruiting body formation of the strain ASI19016 was faster than that of ASI19003. Accordingly, the cultivation of A. cylindracea ASI19003 during the spring, fall and winter, and A. chaxingu ASI19016 during the summer can keep high quality and stable supply all year round of these mushrooms.

• Journal of Bio-Environment Control
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• v.24 no.3
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• pp.153-160
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• 2015

The objectives of this study were to determine optimal length of off-time between irrigation cycles to improve irrigation efficiency using a frequency domain reflectometry (FDR) sensor-automated irrigation (FAI) system for tomato (Solanum lycopersicum L.) cultivation aimed at minimizing effluent from coir substrate hydroponics. For treatments, the 5-minute off-time length between 3-minute run-times (defined as 3R5F), 10-minute off-time length between 3-minute run-times (defined as 3R10F), or 15-minute off-time length between 5-minute run-times (defined as 5R15F) were set. During the 3-minute or 5-minute run-time, a 60mL or 80mL of nutrient solution was irrigated to each plant, respectively. Until 62 days after transplant (DAT) during the autumn to winter cultivation, daily irrigation volume was in the order of 3R5F (858mL) > 5R15F (409mL) > 3R10F (306mL) treatment, and daily drainage ratio was in the order of 3R5F (44%) > 5R15F (23%) > 3R10F (14%). Between 63 and 102 DAT, daily irrigated volume was in the order of 5R15F (888mL) > 3R5F (695mL) > 3R10F (524mL) with the highest drainage ratio, 19% (${\pm}2.6$), at the 5R15F treatment. During the spring to summer cultivation, daily irrigation volume and drainage ratio per plant was higher in the 3R5F treatment than that of the 3R10F treatment. For both cultivations, a higher water use efficiency (WUE) was observed under the 3R10F treatment. Integrated all the data suggest that the optimal off-time length is 10 minutes.

• Korean journal of applied entomology
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• v.48 no.4
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• pp.503-508
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• 2009

Biological-control-based-integrated-pest-management of major pests occurring on sweet pepper in greenhouse during summer season was tried. As many as 2.1 Orius laevigatus per $m^2$ were released in two times on June 6 and 19, and the population of thrips was kept under control and accordingly the damage was negligible throughout the season. To control aphids, a total of 0.8 Aphidius colemani per $m^2$ were released in four times, 0.2 of them at a time, flonicamid on May 14 and July 18 and pymetrozine on June 14 and September 4 were sprayed on the spots of high aphid occurrence to reduce the release of the wasp, and the density of aphids was kept under control. Whitefly was controlled successfully by releasing a total of 343.4 Amblyseius swirski per $m^2$ in nine times, 38.1 of them at a time, from May 9 until November 12 and dinotefuran was sprayed on November 12 when the density of whitefly increased up to 200 per trap. Tetranichus kanzawai was controlled by both Phytoseiulus persimilis which was released a total of 44.4 per $m^2$ in five times 8.9 of them at a time from May 23 to September 10, and the A. swirski which was released for the control of whitefly.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.41 no.1
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• pp.86-94
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• 1996

This experiment was carried out to investigate the differences of the growth and yield characteristics at different planting dates in two soybean ecotypes from 1993 to 1994. Two summer types of soybean varieties, Suwon 163 and CNS 342, and two autumn types, Hwangkumkong and Keomcheongkong ＃1 were planted 7 times from 22 April to 21 June with 10 days interval in 1993 and 4 times from 22 April to 21 June with 20 days interval in 1994 at experimental field, Dankook University, Cheonan. Emergence rate was shown to difference between the summer types and the autumn types, as planting date delayed and between 1993 and 1994. The average emergence period was more shortened in 1994 than 1993. This was reduced as planting date delayed. Days to flowering, pod formation and maturity were shortened as planting date delayed, and observed that shortening of days to flowering and maturity were smaller in the summer types than the autumn types. Stem height, stem diameter, number of mainstem nodes, number of branches and number of branch nodes were different between the summer types and the autumn types and between 1993 and 1994. These were reduced as planting date delayed. The number of pods per plant was also different between 1993 and 1994, and reduced as planting date delayed. The number of seeds per pod was not different between 1993 and 1994, and shown to similar tendency as planting date delayed. It was observed that one hundred seed weight of the summer types were reduced, but the autumn types were not as planted date delayed in 1993. In 1994, one hundred seed weight was not measured because almost all pods were unfilled or shriveled probably due to high temperature during pod formation period. The rate of unfilled pods per plant was higher the autumn types than in the summer type of soybeans in 1994.

• Research in Plant Disease
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• v.26 no.4
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• pp.256-263
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• 2020

Incidence of Fusarium wilt was surveyed in fields of summer radish in Gangwon province in Korea in 2018 and 2019. The disease started in early July and spread rapidly in hot summer of late July and August and in severe case, reached up to 80% in a field in Gangneung area. Symptoms in the seedling stage include poor growth and browning of internal tissue of root. During mid-growth, the leaves of diseased plant turned yellow over time, the surface of the roots changed from white to blackish, and the vascular tissues turned brown. A total of 23 isolates was obtained from the diseased plants and identified as Fusarium oxysporum f. sp. raphani by elongation factor-1α and intergenic spacer sequence analysis. Pathogenicity of the isolates was tested by artificial inoculation to the radish and other plants. All the isolates tested were pathogenic to radish plant, although there were differences in virulence on radish 11 cultivars. However, the isolates were not virulent to other plants except some cruciferous vegetables including Brussels sprouts, rocket, stock, and turnip. The results of pathogenicity test showed that it is necessary to rotate with crops other than cruciferous vegetables in order to prevent Fusarium wilt from radish fields.

• Horticultural Science & Technology
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• v.30 no.1
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• pp.101-105
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• 2012

'Secret Pink' was released by National Institute of Horticultural & Herbal Science in 2008. The cross was made between '03B1-23' and 'Sei-Monaco in 2005'. After the evaluation of the characteristics under shade culture in summer and retarding culture in spring and consecutive selection from 2006 to 2008, 'Secret Pink' was selected finality. The natural flowering time of 'Secret Pink' was the middle of October, and it is possible to flower all year round by shade and light culture. It has single type flowers with pink petals. The growth of plant was very vigorous and response time was 6.5 weeks. The diameter of flower was 6.7 cm. Number of flowers per stem and petals per flower were 14.5 and 25, respectively. Days to flowering under the short day treatment was about 50 and its vase life was 25.5 days in autumn season.

• Journal of Bio-Environment Control
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• v.29 no.1
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• pp.28-35
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• 2020

This study is to compare irrigation efficiency between sap flow sensor automated system (SF) and conventional irrigation system based on integrated solar radiation automated system (ISR) in tomato rockwool hydroponics. Total irrigated volumes was higher in the ISR system by 5.0L per plant, a lower drainage rate was found in the SF system, compared to the ISR system. There was no difference in shoot and fruit fresh weights, water use efficiency (WUE) and water amount consumed for producing 200g of tomato fruit. The daily average sap flow density (SFD) was closer to the change of solar irradiance (SI) in the plant grown under the SF system, compared to the ISR system. The correlation coefficient (r²) between the fruit diameter and the volumetric water content during the 56 and 82 days after transplant showed the SF treatment was higher than the ISR at night and daytime, and the correlation was higher at night time. The sap flow density and humidity deficit (HD) of SF treatment was related as closely as the solar irradiance. Further studies should demonstrate that SF irrigation system is a convenient method for hydroponic farmers with advantages, such as growth, higher yield, WUE, and accuracy.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.58 no.3
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• pp.253-259
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• 2013

This study was conducted to investigate proper mixed cultivation system of potato and succeeding crops (Chinese cabbage and Radish) in 2009. Potato varieties, 'Superior' a middle maturing variety and 'Haryeong' a late maturing variety were used. After potato harvest, succeeding crops of Radish and Chinese cabbage were planted on July 22th in 'Superior' variety plot and Aug. 3rd in 'Haryeong' variety plot. Potato crop was harvested in proper time, after 15, 30, 45 and 60 days. and a suitable potato variety for succeeding crops among 'Superior' and 'Haryeong' was checked. 'Superior' variety was observed to be low rotting, deformity and greening at Chinese cabbage and Radish treatment plot than non-treatment plot. In addition, high yields of potato was maintained in succeeding crop treatments.

• Journal of The Korean Society of Grassland and Forage Science
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• v.31 no.4
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• pp.353-360
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• 2011

This experiment was carried out to know adaptability, forage production and quality of corn hybrid for silage at paddy field at Chungnam region. Among agronomic characteristics, 'P32T83' hybrid was somewhat strong for waterlogging and good stay green, and low ear height as 57 cm and thicker stem diameter as 15.1 mm, and higher sugar content as 12 (Bo, %). The fresh and dry matter yield of 'P32T83' hybrid were the highest 55,220 kg/ha and 19,680 kg/ha, respectively. 'NC7117' hybrid was thicker as 15.5 cm and somewhat strong for waterlogging. The fresh and dry matter yield of 'NC7117' were 50,890 kg/ha and 19,110 kg/ha, respectively. The 'P32T83' hybrid was high as 81.9% in vitro dry matter digestibility (IVDMD). The result of this study indicated that 'P32T83' and 'NC7117' hybrid could be recommended as having good characters according to production, waterlogging tolerance, stay green, sugar content, and stem diameter at paddy field in Chungnam region.