• KOREAN JOURNAL OF CROP SCIENCE
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• v.51 no.7
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• pp.584-592
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• 2006

This study was conducted to investigate the effects of sowing date on yield component and yield in sprout-soybean. Six sprout-soybean cultivars were planted on three sowing dates in 2000 and 2001. 100-seed weight, number of seeds per pod, number of seeds, number of pods per plant, and ratio of empty pods distinct differences between sowing dates and cultivars. All yield components except the 100-seed weight and number of seeds per pod diminished recording where the sowing day will be late. The ratio of pods with two or three seeds was 77.5 from 80.9 percents. The ratio of two-seed pods were affected by sowing date. The yield of soybean of May 25 sowing was 290 kg/10a followed by June 15 and July 5 sowing with 269 kg/10a and 221 kg/10a, respectively Late sowing greatly decreased the yield of Doremikong, while yields of Tawonkong were more a less stable. In 2000, yield showed positive correlation with number of branches, number of pods per plant, number of seeds per plant, dry weight, leaf area, and oil content. While yield of 2001 showed positive correlation with number of nodes on main stem, stem thickness, number of pods per plant, dry weight, and leaf area.

• Journal of the Korean Geophysical Society
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• v.8 no.2
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• pp.81-87
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• 2005

Acquisition and processing of vector seismic waves were conducted through simultaneous generation of P, SH, and SV waves and receiving those waves using three-component geophones. Test data were received by 24 8-Hz geophones at an interval of 2 m along a 94-m profile. The data were recorded for 512 ms with sampling intervals of 0.2 ms. Raw data indicate that both reflected and refracted P waves are strongly recorded on the vertical component while SH waves are significant on the transverse horizontal component. On the inline horizontal component, both direct P and converted PS waves are recorded. First arrivals of P and SH waves were detected simultaneously on the vertical and transverse horizontal axes, respectively. The recorded vector data were separately inverted using traveltime tomography to yield P- and SH-wave sections. Using those two velocity sections, Poisson's ratios were able to be obtained effectively.

• Proceedings of the Korean Society of Crop Science Conference
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• 1991.05a
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• pp.16-17
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• 1991

• Journal of Korean Society of Forest Science
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• v.95 no.2
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• pp.188-193
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• 2006

Volunteerism is an emerging issue in public resource management such as forest recreation management. As volunteers, forest interpreters play a significant role in supporting and educating visitors to forest recreation areas. The purpose of this study was to examine forest interpreters' motivation and their job satisfaction. To collect data, a set of self-administered questionnaire was sent to 250 members of Chungbuk Forest Interpreters' Association during August and September of 2005. 152 completed questionnaires were returned. Principal component factor analyses yield five motivation factors and four satisfaction factors. All the factors were highly correlated.

• Journal of the Korean Operations Research and Management Science Society
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• v.4 no.1
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• pp.87-102
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• 1979

In Korea, the traditional main food is rice There is a shortage of food, though the land is uesd intensively. The Koreans produce mainly rice its yield is very much higher than other crops. This leads to the comsumption of one type of food and, hence, to an unbalanced diet. Since 1962, Korean income has been going up rapidly, and the demand for animal protein has also increased. In order to solve the probem, the government decided to develop the dairy industry, because this would enable the population to consume more animal protein, and there is weak competion between rice and milk production.

• Proceedings of the Korean Society of Crop Science Conference
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• 1999.05a
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• pp.124-125
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• 1999

• Proceedings of the Korean Society of Crop Science Conference
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• 2005.08a
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• pp.176-177
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• 2005

• 한국약용작물학회:학술대회논문집
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• 2008.05a
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• pp.122-123
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• 2008

• KOREAN JOURNAL OF CROP SCIENCE
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• v.28 no.2
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• pp.164-172
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• 1983

The present study was conducted to investigate the variations in morphological traits, yield and yield-related components of rice cultivars exposed to different weather conditions by growing at the locations with different altitude but with equal latitude. Three Japonica varieties (Daegoldo, Jinheung, Shin #2) and three Tongil type semi-dwarf varieties(Josaengtongil, Suweon 287, wx 817-65-2-3) were seeded at Suweon on April 21 and transplanted at Suweon ($127^{\circ}$ N37 20', altitude 37m) and Jechun ($128.2^{\circ}$, N37 10', altitude 280-300m) on June 1 with the spacing of 30 $\times$ 15 em. The morphological traits, yield and yield-related components were measured. Culm length, paincle length and 1000-grain weight showed a little increase in Japonica varieties in Jechun as compared to those in Suweon and vice versa in semi-dwarf varieties, showing no significant differences. Number of panicles, per hill and number of spikelets per panicle among yield-related components showed remarkable increase in all varieties in Jechun as compared to those in 'Suweon but such inter-locational differences differed with varieties within varietal group and between varietal groups. On the contrary, grain fertility was higher in Suweon than that in Jechun and in Japonica varieties than that in semi-dwarf varieites , showing greater inter-locational difference in semi-dwarf varieties. Among Japonica varieties Jinheung and Shin #2 showed remarkable increase in yield in Jechun as compared to that in Suweon but in semidwarf varieties it was just the opposite. The importance of each of the yield-related component contributing to yield showed similar tendency 'regardless of locations in Japonica varieties. However, it was evidently different between locations in semidwarf varieties, where number of spikelets per panicle showed greatest direct effect on yield in Suweon but in Jechun so did grain fertility followed by the number of spikelets per panicle.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.20
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• pp.152-162
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• 1975

Five barley varieties were compared under six 1evels of nitrogen fertilization and two methods of cultural management, conventional and drill seeding. The increase in grain yield and nitrogen content of the leaves showed a significant linear regression from added increaments of nitrogen in Haganemugi and Olbori, particulary under drill seeding. The other varieties resulted in various degrees of lodging and no significant increases in yield. The spike number per square meter was the major component of yield, but when the spike number per square meter was sufficient, 1000 grain weight was equally as important as a component of yield.