• 어항어장
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• s.15
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• pp.59-65
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• 1991

• Nuclear industry
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• v.27 no.8 s.294
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• pp.48-52
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• 2007

• Radioisotope journal
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• v.17 no.2
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• pp.70-79
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• 2002

• Information and Communications Magazine
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• v.16 no.2
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• pp.83-94
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• 1999

• 방재와보험
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• s.55
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• pp.26-30
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• 1992

• Proceedings of the Korean Reliability Society Conference
• /
• 2005.06a
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• pp.41-44
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• 2005

• KOREAN POULTRY JOURNAL
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• v.8 no.4 s.78
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• pp.98-100
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• 1976

• Research in Plant Disease
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• v.12 no.1
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• pp.28-31
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• 2006

One of major potato viruses is Potato virus Y (PVY) in Korea. In the southern part of Korea, potatoes have been grown as double crops in a year by using cv. 'Dejima' and 'Chubak' due to very short dormancy. However, they have caused a serious problem such as a rapid degeneration. It has been thought that the degeneration is affected by the high incidence of PVY in neighboring potato fields. Therefore, the investigation of factors causing the degeneration is very important in the production of healthy seed potato. In this study, the PVY reinfection rates of several potato varieties and the different seed sources of cv. 'Chubak' have been investigated. Results show that the lowest infection rate of PVY among four potato cultivars derived from minitubers is cv. 'Superior'. The others are in order of 'Dejima', 'Atlantic' and 'Chubak'. Also, the incidences of PVY differ significantly when several seed sources are examined. When the seed potatoes (G2, the progeny of microtuber) as spring potato crops are planted in area without potato field nearby, the infection rate of PVY is as low as that of microtubers. However, PVY incidence in the progenies of minitubers as fall potato crops largely increases. Therefore, the best way of potato production under double cropping system is to use the healthy seed potato produced in area without potato field and plant relatively resistant cultivar such as Dejima.

• Korean Journal of Medicinal Crop Science
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• v.9 no.4
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• pp.295-300
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• 2001

This experiment was conducted to evaluate the germination rate according to temperature, pelleting materials, pelleted size, seed storage periods under light and dark conditions in Rehmannia glutinosa. The highest germination rate was obtained from $25^{\circ}C$ in both light and dark condition. Two-year old seeds showed higher germination rate compared to one-year old seed. Talc material showed the highest germination rate among the pelleting materials by 82.5%. Among the different pelleting sizes, the highest germination rate was shown in 2.0 mm, and especially Talc pelleting showed 100% germination rate on 17days after seeding. In case of combination of pelleting materials, both of talc + vermiculite, zeolite + vermiculite showed lower germination rate than the control and 0.7 mm pelleted seed showed the highest germination rate.

• Journal of Practical Agriculture & Fisheries Research
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• v.14 no.1
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• pp.119-130
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• 2012

To increasing efficiency of the seed production through GA₃ treatment, treatment of GA₃ 20mg/ℓ at its fourteen leaf stage had an effect on 21% increasing seed yield at leaf lettuce (cv.'Ttugseomjeokchugmyeon') in seed production from 50.9ℓ/10a to 61.7ℓ/10a, and 'GA₃ 50mg/ℓ at its eight leaf and fourteen leaf stage had a effect on 14% increasing the seed yield of head lettuce (cv.'Urake') at seed production from 14.2ℓ/10a to 21.1ℓ/10a reducing rate of dead plant in field. Especially, it will be recommended for planting after June for seed production of head lettuce owing to decreasing rate of dead by soft rot and stem rot.