• Journal of The Korean Society of Grassland and Forage Science
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• v.4 no.2
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• pp.147-151
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• 1983

In order to know the effect of planting date and cutting management on Jerusalem Artichoke (Helianthus truberosus L.) as a new forage or energy crop, JA tubes were planted from April 7 to June 27 with 20 day interval. Growth and yield could stay high as normal planting if tuber planting had been done until late May. The delayed planting after June caused deterioration of seed tuber, produced poor emergence and retarded growth. Previous harvested field did not need additional planting every spring because there were enough leftover tubers usually small size, less than 3gr., to provide a dense seedling establishment. This plot had too dense in population to adjust its spacing by thinning some of seedlings. One or two times cutting for forage or silage production reduced tuber yield very significantly. Therefore, it was not a good management to harvest for both forage and tuber production. Topping at 20cm from growing point in early July prevented from lodging and assured tuber yield.

• Korean Journal of Breeding Science
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• v.41 no.3
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• pp.342-345
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• 2009

"Hwaweon 2" was developed from an interspecific cross between Hwaseongbyeo and a wild species, Oryza rufipogon L. (IRGC 105491) based on marker-aided selection. The recurrent parent "Hwaseongbyeo" is a high grain quality cultivar with medium-maturity. Hwaweon 2 is nearly isogenic to Hwaseongbyeo except a small O. rufipogon introgression on chromosome 9. This segment was associated with genes controlling a number of traits including grain weight, heading date, culm length, and spikelets per panicle. The preliminary and replicated yield trial was conducted at Chungnam National University in 2004, 2005 and 2006. The local adaptability test was carried out by the National Seed Management Office (NSMO) in 2007 and 2008. This cultivar was registered to NSMO with a cultivar designated as "Hwaweon 2". This cultivar averaged 98cm in culm length and has a medium to late growth duration. This variety is resistant to stripe virus as the recurrent parent. Milled rice of "Hwaweon 2" is translucent and the grain quality traits are comparable to those of the recurrent parent. The yield potential of "Hwaweon 2" in grain is about 7.68 MT/ha at the ordinary fertilizer level about 14% higher than that of Hwaseongbyeo due to increase in grain weight and spikelets per panicle.

• Korean Journal of Breeding Science
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• v.41 no.3
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• pp.338-341
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• 2009

"Hwaweon 1" was developed from an interspecific cross between Hwaseongbyeo and a wild species, Oryza rufipogon L. (IRGC 105491) based on marker-aided selection. The recurrent parent "Hwaseongbyeo" is a high grain quality cultivar with medium-maturity. Hwaweon 1 is nearly isogenic to Hwaseongbyeo except a small O. rufipogon introgression on chromosome 8 harboring the gene for grain weight. The preliminary and replicated yield trial was conducted at Chungnam National University in 2004, 2005 and 2006. The local adaptability test was carried out by the National Seed Management Office (NSMO) in 2007 and 2008. This cultivar was registered to NSMO with a cultivar designated as "Hwaweon 1". This cultivar averaged 89 cm in culm length and has a medium growth duration. This cultivar is resistant to stripe virus as the recurrent parent, Hwaseongbyeo. Milled rice of "Hwaweon 1" is translucent and the grain quality traits are comparable to those of the recurrent parent. The yield potential of "Hwaweon 1" in grain is about 7.43 MT/ha at the ordinary fertilizer level about 10% higher than that of Hwaseongbyeo mainly due to increase in grain weight.

• FLOWER RESEARCH JOURNAL
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• v.17 no.3
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• pp.152-157
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• 2009

To obtain pure lines for breeding $F_1$ varieties of Primula malacoides, 10 lines that were considered uniform in growth and flowering characteristics were selected from self-crossings of the sixth generation ($S_6$). Plant height of the selected lines ranged from 20.8 to 33.2 cm, and number of leaves ranged from 33.6 to 54.2. The selected lines flowered at 181.4 to 207.8 days after sowing. Three lines, including 'PR-03-81', flowered in less than 190 days from sowing, while six lines, including 'PR-03-228', only flowered after more than 200 days from sowing. In terms of petal color, six lines, including 'PR-03-81', were pink, three, including 'PR-03-236', were purple, and line 'PR-03-275' was white. Flower diameter ranged from 2.4 to 2.9 cm, and number of pedicels per plant was between 15.4 and 26.4. Number of flowers per pedicel ranged from 20.2 to 30.2. Germination was more than 70%, and number of seeds per capsule (pod) ranged from 110.0 to 162.8. In summary, plant height was low and flower diameter was small and plants had many flowers and readily formed seeds. The selected lines are not only valuable as ornamental plants but could also be used as breeding materials for $F_1$ hybrids of Primula polyantha.

• Journal of Conservation Science
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• v.37 no.5
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• pp.579-589
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• 2021

Five waterlogged wood artefacts were excavated from Suyeong-ri site in Hwaseong, South Korea. The aim of the present study was to identify the species and estimate the date of manufacture and the manufacturing method of these artefacts. The study also aimed to conserve the original shapes of waterlogged wood artefacts by using the vacuum freeze drying method. The two large waterlogged woods were identified as Ulmus spp. and Morus spp., whereas one of the three small waterlogged woods was identified as Abies spp. and the other two as hard pine. Radiocarbon dating using wiggle match dated the manufacturing of these wooden artefacts between BCE 8520-8490 or BCE 8470-8290 in the Neolithic age, and a similar period was also confirmed for seed excavated from a place close to the location where the waterlogged wood artefacts were excavated. The surface of waterlogged wood artefacts had several traces of manufacturing processes - traces of tearing and chopping - were observed. Based on these observations, it was confirmed that stone adz was used to make these wooden artefacts. Thereafter, the waterlogged wood samples were conserved by immersing them into PEG#4,000 of concentration in water from 10% to 40% at room temperature(15~25℃) and subjecting them to vacuum freeze drying. However, the internal moisture was not completely removed in some thick parts of waterlogged woods by applying the general schedule such as raising the shelf temperature as the surface temperature rises. Therefore, additional study is required using the schedule-method for vacuum freeze drying of large waterlogged wood.

• Journal of The Korean Society of Grassland and Forage Science
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• v.41 no.3
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• pp.168-175
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• 2021

The optimal determination of seeding rate is critical to minimizing uncertainties about the large variations observed in forage quality and productivity when alfalfa is cultivated under different geographical areas and growing conditions. The objective of this investigation was to provide information about the proper seeding rate according to harvest timing for alfalfa cultivation in the Northern regions of Korea. Alfalfa was sown in September 2018 at a seeding rate of 20, 30 or 40 kg/ha and harvested four times in 2019: May 3, July 2, September 11, and October 13. Regardless of seeding rate, alfalfa plant height was longest at the third harvest (113 cm) and the shortest in the last annual harvest (43.8 cm). However, seeding rate had no effect on alfalfa plant height at any harvest. Forage relative feed value was increased in the first cutting but decreased in the third cuttings as seeding rate increased. However, seeding rate had slight effect on alfalfa forage quality components at the second and fourth cuttings. Total annual DM and crude protein production (in 4 harvests) was greater at higher seeding rates. Plots seeded at a rate of 40 kg/ha produced on average 1,257 and 2,620 kg/ha more forage (DM basis) than those seeded at a rate of 30 or 20 kg/ha, respectively. Forage DM production at the first, second, third, and fourth harvests accounted for 36.1, 24.0, 27.1, and 12.8 % of total annual DM production, respectively. Overall, small differences were seen when alfalfa seeding rate was different but maximum forage DM production (in four harvests) was detected when seeding rate was 40 kg/ha. These data could be useful to the alfalfa growers by allowing them to make more accurate trade-offs between seed price and the expected magnitude of forage yield gains in order to select the best seeding rate.

• Korean Journal of Breeding Science
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• v.49 no.3
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• pp.250-255
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• 2017

'Hwaweon 7' was developed from a cross between the African upland cultivar, 'Moroberekan' and 'Ilpumbyeo' based on marker-aided backcross selection. The recurrent parent, Ilpumbyeo is a high grain quality cultivar with medium to late maturity. Hwaweon 7 is nearly isogenic to Ilpumbyeo except a small Moroberekan introgressed segment on chromosome 6 harboring genes related with spikelets per panicle and internode diameter. The preliminary and replicated yield trial was conducted at Chungnam National University and Chungcheongnamdo Agricultural Research & Extension (CARES), Yesan in 2010 and 2011. The local adaptability test was carried out by the National Seed Management Office (NSMO) in 2012 and 2013. This cultivar was registered to NSMO with a cultivar designated as "Hwaweon7". This cultivar averaged 80cm in culm length and has a medium growth duration. Milled rice of "Hwaweon7" is translucent and the grain quality traits are comparable to those of the recurrent parent. The average yield potential of Hwaweon 7 in grain was about 6.48 MT/ha at the ordinary fertilizer level for two years about 5.1% higher than that of Ilpumbyeo due to increase in spikelets per panicle. This variety is tolerant to lodging and the tolerance is due to the APO1 gene controlling the base internode diameter on chromosome 6 introgressed from the donor parent, Moroberekan. The Apo1 gene would be useful in enhancing resistance to lodging in rice breeding program.

• Korean Journal of Breeding Science
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• v.49 no.3
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• pp.280-284
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• 2017

'Hwaweon 6' was developed from a cross between 'Hwaseongbyeo' and a wild species, Oryza minuta L. (Acc. No. 101154) based on marker-assisted selection and backcrossing. The recurrent parent 'Hwaseongbyeo' is a high grain quality cultivar with medium maturity. Hwaweon 6 is nearly isogenic to Hwaseongbyeo except a small O. minuta introgressed segment on chromosome 7 harboring genes related with spikelets per panicle. The preliminary and replicated yield trial was conducted at Chungnam National University and Chungcheongnamdo Agricultural Research & Extension (CARES), Yesan in 2009 and 2010. The local adaptability test was carried out by the National Seed Management Office (NSMO) in 2011 and 2012. This cultivar was registered to NSMO with a cultivar designated as Hwaweon 6. This cultivar averaged 80cm in culm length and has a medium growth duration. Milled rice of Hwaweon 6 is translucent and the grain quality traits are comparable to those of the recurrent parent. The average yield potential of Hwaweon 6 in grain was about 6.57 MT/ha at the ordinary fertilizer level for two years about 3.0% higher than that of Hwaseongbyeo due to an introgression of the quantitative trait locus (QTL) for spikelets per panicle (qSPP7) from O. minuta. This variety is comparable to Hwaseongbyeo in low temperature germinability and cold tolerance. The qSPP7 QTL would be useful in enhancing yield potential in rice breeding program.

• Korean Journal of Breeding Science
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• v.43 no.6
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• pp.620-624
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• 2011

'Hwaweon 4' was developed from a cross between the African upland cultivar, 'Moroberekan' and 'Ilpumbyeo' based on marker-aided backcross selection. The recurrent parent 'Ilpumbyeo' is a high grain quality cultivar with medium to late maturity. 'Hwaweon 4' is nearly isogenic to 'Ilpumbyeo' except a small Moroberekan introgressed segment on chromosome 4 harboring the resistance gene for blast. The preliminary and replicated yield trial was conducted at Chungnam National University in 2006 and 2007. The local adaptability test was carried out by the National Seed Management Office (NSMO) from 2008 to 2009. This cultivar was registered to NSMO with a cultivar designated as 'Hwaweon 4'. This cultivar averaged 76 cm in culm length and has medium growth duration. Milled rice of 'Hwaweon 4' is translucent and the grain quality traits are comparable to those of the recurrent parent. It has low protein content. The yield potential of 'Hwaweon 4' in grain was about 6.31 MT/ha at the ordinary fertilizer level for two years. This variety showed highly resistance reaction at the blast nursery test at four locations and also at the sequential planting method. This resistance is due to the resistance gene designated as Pi45(t) on chromosome 4 introgressed from the donor parent, 'Moroberekan'. The Pi45(t) gene would be useful inenhancing resistance to blast in rice breeding program.

• Korean Journal of Breeding Science
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• v.42 no.3
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• pp.222-225
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• 2010

'Seoritae' is a very famous variety of black soybean for mixed cooking with rice in Korea. However, it has a couple of bad traits such as late flowering and maturity. To improve these characteristics, seeds of original 'Seoritae' were irradiated using a 250 Gy gamma ray in 1994. Some mutants were identified and finally a new soybean variety 'Josaengseori' was developed in 2005. This variety has a few distinguishable characteristics such as smaller grain size, early maturity and high yielding compared to the 'Seoritae'. The flowering period of 'Josaengseori' is 57 days after seeding (DAS), which is 10 days earlier than that of 'Seoritae' (67 DAS). The maturation period of 'Josaengseori' is 130 DAS, which is 34 days earlier than 'Seoritae' (164 DAS). And the total yield of the new variety with 179 kg/10a is 2.4 times higher than that of 'Seoritae' with 74 kg/10a. 100 grain weight of 'Josaengseori' is 32.8 g, which is 20% lower than that of 'Seoritae' with 40.1 g.