• KOREAN JOURNAL OF CROP SCIENCE
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• v.34 no.1
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• pp.48-54
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• 1989

This study was conducted to select the best adapted alfalfa cultivars among 32 introduced alfalfa cultivars in the Korean environmental condition. Plant height and dry matter yield per cultivar were determined. On the point of plant height, seven high ranked cultivars among the 32 alfalfa cultivars in high order were Diamond> Milkmaker> Arrow>Chalienger>Sapphire > Dekalb brand 135> LS-1920. and seven low ranked cultivars in low order were Pioneer brand 5929> Maxidor> Dekalb brand 167> Pierce> Blazer> Raidor> Pioneer brand 532. Seven high ranked cultivars from 32 alfalfa cultivars on the dry matter yield in high order were Pike>LS-1920>Challenger>Salute>Diamond>Decathlon>Pioneer brand 581, and seven low ranked cultivars in low order were Maxidor>Pioneer brand 5929>Pioneer brand 532>Florida 77> Pierce> Magnum> Blazer. Dry matter yield per cultivar was also greater when alfalfa cultivar was appeared higher plant height compared with those which were lower plant height. Leading cultivars for plant growth and yield under the Korean environmental condition were Pike, LS-1920, Challenger, Salute, Diamond among the 32 alfalfa cultivars. All those cultivars except Challenger cultivar are Semi-dormant which can be well grown under moderate temperatures.

• Korean Journal of Plant Resources
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• v.27 no.1
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• pp.89-94
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• 2014

Varietal distances were measured by Mahalanobis's $D^2$ statistics in 190 possible comparisons among twenty varieties of Prunus mume with twelve characters such as seed weight, length, width, and diameter, fruit weight, and number of sepals, petals, pistils, and stigmas, and leaf length and width. A complete linkage cluster analysis based on the Mahalanobis's distance ($D^2$) was attempt. Twenty varieties of Prunus mume were largely classified into five subgroups. Group I, II, III, IV and V included two, four, five, five and four varieties, respectively. Most of the varietal groups were not associated with their geographical origins. Number of stigmas, and leaf length and width among the twelve characters were the largest contributors to the $D^2$ in both intra-and inter groups.

• Korean Journal of Plant Resources
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• v.14 no.3
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• pp.286-294
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• 2001

Soil-borne barley viruses were investigated in 42 regions during 1999-2003, in Korea. BaYMV, BaMMV and SbWMV symptoms were found in 37 regions. Crops resistance to mosaic viruses were investigated by growing them on 10 regions infected with soil-borne viruses. It was found that 10 unhulled barley, 6-beer bar]ey, 16 rye and 2 wheat species showed resistance to virus. Most of 15 Japanese cultivars showed infection symptoms but many of them showed relatively higher resistance in Ikasan, Youngkwang and Yesan areas region. Mixed virus infection was investigated and it was found that inter-regional species except in 10 areas, were mix infected with BaYMV and BaMMV. But in Youngkwang area all of crop species except Secheon-6 were infected only with BaYMV. Japanese cultivars were mixed infected with BaMMV and BaYMV except at Yesan that were infected only with BaYMV.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.41 no.6
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• pp.718-724
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• 1996

Two soybean cultivars, ‘Lee’ and ‘Peking’, were used to evaluate the competition and interaction of rhizobium strains PRC205 (R. fredii, fast-grower) and USDA110 (B. japonicum, slow-grower). Strains were inoculated separately on the root parts of a split-root growth system. Both root sides were inoculated simultaneously with four combinations of strain treatment to evaluate the competition of strains. And to evaluate the interaction of strains one side of split-root system was inoculated a week prior to the other side. Nodule mass and dry weight of the plants were measured 3 weeks after treatments. PRC205 showed no effective nodulation and no competing ability with USDA110 on Lee cultivar, however, contrary results on Peking cultivar. Top dry weight of Lee inoculated with PRC205 was much lower than that of any other inoculation treatments, however, in Peking that with PRC205 was higher than that with USDA110. There were no differences in root dry weight among the inoculation treatments. USDA110 used as primary inoculant suppressed nodule mass of opposite side, secondary inoculant, severely in both cultivars. PRC205 showed same tendency as USDA110 in Peking, but revealed little suppression effects on USDA110 used as secondary inoculant in Lee. USDA110 used as primary inoculant in Lee and PRC205 in Peking showed much more dry weight of soybean plants than that of other treatments.

• Korean journal of applied entomology
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• v.26 no.4 s.73
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• pp.245-249
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• 1987

In the 82 apple varieties tested, the distribution of varieties grouped on the damage degree to Alternaria leaf spot were 15 varieties(l8.3%), which damaged above 50%, and 51 varieties(62.2%) damaged below 5%. Susceptible varieties to Alternaria leaf spot were Raritan, Indo, Winesap and Starkrimson, moderately resistant varieties Sekaiichi and Starking, and resistant Jonathan, Tsugaru, Molliies, Jonagold, Gala etc. The leaf hair density on the backside of leaf were rarer inresistant varieties than susceptible one. In inoculation test, penetration and infection of Alternaria mali were easier on the backside than surface of apple leaf at the same varity, and infection rate with Alternaria mali were higher at removal treatment than non-removal one of leaf hairs, so we can guess that leaf hair are related to resistance of variety to Alternaria mali.

• Korean journal of applied entomology
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• v.12 no.4 s.17
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• pp.139-142
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• 1973

Experiment was conducted to study resistance of rice varieties and lines originated from Korea and IRRI-sources to the white-backed planthopper, Sogatella furcifera Horvath. The nature of varietal resistance to the insects was evaluated from the viewpoints of nymphal period and adult emergence. The varieties Colombia, Muthumanikam and Pankhari-203 were resistant, the varieties CO-22, Mudgo and Vellailangalayan moderately susceptible, the other varieties all susceptible. Nymphal period and rate of adult emergence were significantly different according to the degree of resistance of the rice varieties. Nymphal period was short (about 10 days) in the susceptible varieties and long (about 14-16 days) in the resistant varieties. The .ate of adult emergence was significantly lower in the resistant varieties than in the susceptible varieties. The lower rate of adult emergence in the resistant varieties may be due to the fact that the insects were suffered higher nymphal mortality in the resistant than in the susceptible varieties.

• The Korean Journal of Mycology
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• v.36 no.2
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• pp.130-137
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• 2008

To distinct the commercial strains in Pleurotus spp., 81 strains in eight Pleurotus species were used. DNA fingerprinting using URP-PCR was conducted to determine the phylogenetic relationships among Pleurotus strains. DNA profiles of Pleurotus species obtained by twelve URP primers were analyzed for genetic similarity by NTSYS program. We could divide strains into ten clusters, in which three of them belong to P. ostreatus and the others to the different species, respectively. At the 76% similarity level, 70 P. ostreatus strains were distinguished into three clusters. Cluster I contained 35 strains and some of them showed almost 100% similarity, one strain closely related to Weonhyeong and six strains closely related to Wangheukpyeong. In cluster II, twenty-one out of 23 strains showed 100% to Suhan. Cluster III contained twelve strains, including six strains closely related to Chunchu-2. The results suggested that there are many same strains with different names in mushroom spawn market.

• Journal of The Korean Society of Grassland and Forage Science
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• v.13 no.1
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• pp.66-77
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• 1993

The experiment reported here was conducted at Suweon and Sunghwan. to evaluate desirable agronomic characteristics, forage yield and quality of nine introduced oat (Avena sativa L.) cultivars in comparison with the control cultivar Cayuse during the fall and spring seasons for three years. Speed oat and G-sprinter showed earlier in maturity than the control cultivar Cayuse, but Taiho, Zenshin and Almighty were recorded as late types. Taiho, Hay oat and Swallow tended to more lodging than the control cultivar under rainy growing conditions and Taiho, Zenshin and Hay oat were more susceptible to barley yellow dwarf virus among the cultivars tested. At Suweon, the early type cultivars Speed oat and G-sprinter significantly outyielded the control cultivar Cayuse over the 3 years of the fall experiment, but no significant forage yield was found between the early type cultivars and the control in the spring experiment except for 1991 At Sunghwan, the early type Speed oat and late types Almighty and Zenshin significantly outyielded the control in the fall experiment of 1991, but the 3 years of experiment showed no significant difference in the forage yield of oat cultivars in the spring experiment. Over the 3 years of the fall and spring experiments at both Suweon and Sunghwan. the crude protein (CP) content and in vitro dry matter digestibility (IVDMD) of the early types Speed oat and G-sprinter were lower than those of the control and late types, but the acid detergent fiber (ADF) and neutral detergent fiber (NDF) contents of the early types Speed oat and G-sprinter were slightly higher than those of the control and late types. Results of this experiment indicate that the early type oat cultivars tended to higher forage yield than the late types when sown in the fall, but no cultivar differences in dry matter yield were found when sown in the spring.

• Journal of the Korean Society of Food Science and Nutrition
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• v.40 no.5
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• pp.717-724
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• 2011

We evaluated the physicochemical properties of four varieties of muskmelons (Thankyou, Beauty, Picnic, Sympony) during storage at $7^{\circ}C$. We stored Thankyou, Sympony, and Beauty varieties for 28 days at $7^{\circ}C$, while the Picnic variety was stored for 21 days. After the storage period, the mineral content of the Thankyou variety changed the least, by 2.36%, while that of the Sympony and Picnic varieties changed the most. The Thankyou variety also lost the least amount of free sugar content during storage. The Sympony variety had the highest vitamin C content at the beginning of the storage (26.0 mg%/100 g). After 14 days of storage, there was little difference in the vitamin C content of the varieties, which ranged from 11.5 to 12.5 mg%/100 g. The Picnic variety, which had the highest respiratory quotient, indicated lower storability than the other varieties. In a sensory evaluation, the Thankyou variety was considered to be the best in terms of consumer preference. However, the stem water loss seen in this variety tends to be the first thing that consumers see and may determine its merchantable quality.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.32 no.1
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• pp.24-33
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• 1987

Competitive ability and response of grain yield in a mixed cropping of two cultivars having different agronomic traits were evaluated at the Yeongnam Crop Experiment Station in 1984 and 1985. Competitive ability was higher in Indica x Japonica cultivar, Milyang 23, and tall statured cultivar, Samgang-byeo, than in Japonica type cultivar, Nacdongbyeo, short statured type cultivar, Taebaegbyeo, respectively. Compared to pure stand, more grain yield was recorded when mixture rates were over 50% in a seed volume for the mixing rate of high yielding cultivar in two cultivars, but low compared to pure cultivation of the cul-tivar having the higher yielding ability in two cultivars.