• Korean Journal of Organic Agriculture
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• v.7 no.2
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• pp.179-188
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• 1999

The effects of earthworm casts as a plant growth media on the growth of orchardgrass seedlings and the changes of physico-chemical properties in worm casts mixture soils were investigated during the growth period of 1998. Worm casts were mixtured with vermiculite, perlite and peat moss, and mixture ratios of worm casts with commercial recommended soil were 100:0(control), 75:25, 50:50, 25:75, and 0:100, respectively. The results were obtained as follows; 1. Plant length(PL) was increased in higher mixture ratios of worm casts and peat moss than those of other mixture ratios of commercial recommended soils. 2. Number of tillers(NT) were significantly increased in mixture ratios of worm casts and peat moss(50:50) and 100% of vermiculite. 3. Root length(RL) was significantly differences between mixture ratios at the worm casts, and the highest value was obtained at all mixture ratios of worm casts and perlite. 4. Dry weight of leaf(LW) was not significantly differences at mixture ratios of 50:50 in all treatments. Especially, between the mixture ratios of worm casts with peatmoss(25:75) and peat moss(75:25) were not significantly differences in dry weight of leaf(LW). The highest value of dry weight of leaf(LW) was obtained at mixture ratios of peat moss and worm casts. 5. Dry weight of tillers(SW) was not significantly differences at mixture ratios of 50:50 in all treatments, and peat moss(75:25) and vermiculite(75:25), respectively. 6. biological yield(BY) at all treatments were increased by yield components of dry weight of tillers(SW), dry weight of root(RW) and length of root(RL). 7. The biological yield of orchardgrass seedlings was greatly increased with mixture ratios of worm casts and peat moss over the 50%.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.30 no.3
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• pp.277-286
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• 1985

From a series of studies conducted on the local maize lines at the Agr. College of the Chungnam National Univ., a few maize lines with many tillers and ears per plant were identified and tentatively named as MET. The purpose of the study was to evaluate the MET lines, which were selfed for five generations, for silage purpose under the different plant densities. A hybrid, Suwon #19 and a synthetic variety, Puyo #3${\times}$#2, were included for comparison. Plant height at harvesting times showed no significant varietal differences. However, the MET lines were very slow in early plant growth compared to the hybrid or synthetic variety, probably due to inbreeding depression of the MET lines. Total fresh weight at the harvesting times was highest in the MET 1 line. The MET 1 line was about 2,000 kgr. per 10a. higher than the hybrid at the harvesting time. The highest fresh weight was obtained when grown under the plant density of 60 ${\times}$ 20cm. Total dry weight per unit area showed the same tendency as the fresh weight. Total dry weight of MET 1 line was about 2.4 tons per 10a., which was about 10% higher than the hybrid, Suwon #19. As the fresh weight, the total dry weight was also highest in the plant density of 60 ${\times}$ 20cm. The grain yield per 10 are of MET 1 was comparable to the grain yield of the hybrid, especially in the low plant density, 60 ${\times}$ 40cm. The average number of effective tillers of MET lines were 4.5, while the mean tiller number of the hybrid or synthetic variety were none. However, the lodging was one of the problem for growing MET lines. The 100 kernel weight of MET lines was about 9 gr., while the 100 kernel weight of the hybrid or synthetic variety was about 30 grm.

• Proceedings of the Korean Society of Crop Science Conference
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• 1991.05a
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• pp.58-59
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• 1991

• Proceedings of the Korean Society of Crop Science Conference
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• 1991.05a
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• pp.60-61
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• 1991

• Journal of Biosystems Engineering
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• v.9 no.1
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• pp.5-10
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• 1984

Using the renewal theory based on the Weibull distribution, an estimation was made on the number of replacement parts annually required for the after-service of some major parts of power tiller at the local repair shops or dealers. The production requirements of the parts were also estimated for the service in the next 5 years following the sales of power tillers.

• Proceedings of the Korean Society of Plant Biotechnology Conference
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• 2005.11a
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• pp.443-443
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• 2005

• Proceedings of the Korean Society of Crop Science Conference
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• 1998.04a
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• pp.199-200
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• 1998

• KOREAN JOURNAL OF CROP SCIENCE
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• v.24 no.1
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• pp.92-98
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• 1979

Korean local corn lines from various regions in the country were studied for the plant characters such as flowering days. plant height. growth rate. number of ears per plant. leaf size. brace roots and tillers. All the lines without exception were different in plant characters studied and the difference were also apparent among regions from where the original lines were obtained. The variation among lines and original regions indicated that the plant characters were quite dependent upon the magnitude of traditional cultural practices and other environmental factors such as precipitation or cropping systems in regions concerned.

• Proceedings of the Korean Society of Crop Science Conference
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• 1989.05a
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• pp.52-53
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• 1989

• Korean journal of applied entomology
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• v.15 no.1 s.26
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• pp.23-27
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• 1976

Screenhouse experiments were conducted to find out the varietal difference in ovipositional preference of the striped rice borer moths (Chilo suppressalis W.) on eight varieties of rice and its association with several plant morphological characters. The results indicated the strong preference of the moths for ovipositing on several varieties. The varieties Tongil (Suweon 213-1), Yushin, Jinheung and TKM-6 had comparatively more egg masses and more eggs than the varieties IR-26, IR-747, Rexoro and Juckna. The strong ovipositional preference of moths of Tongil, as compared to the resistant variety TKM-6 and the susceptible variety Rexoro, was. always consistent in this study whenever the number of tillers were uniformed and each two varieties were paired. It could be concluded that the moths definitely preferred Tongil among the test varieties. There was not any significant correlations between the ovipositional preference and the plant characters; such as number of tillers per plant, plant height, external diameter of stem, and size of leaf. The cause of strong perference of the moths for ovipositing on short type varieties Tongil and Yushin were still suspectable.