• KOREAN JOURNAL OF CROP SCIENCE
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• v.41 no.4
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• pp.420-428
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• 1996

This study was conducted to investigate the response of growth and yield of rice under five different cultural methods, machine transplanting(MTNT), puddled drill seeding (PDSNT), drill seeding on soil surface (DSNT) , broadcasting on soil surface (BSNT) under no-tillage paddy condition and conventional machine transplanting(MTT) in Jeonbuk series(siltyloam soil) from 1993 to 1995. Soil hardness was higher in no-tillage soil and increased with highly difference between tillaged and no-tillage soil with deeper soil depth. Bulk density was heavier in no-tillage soil and porosity was higher in tilled soil than that of the control. The rate of effective tiller was higher in MTT, following MTNT, PDSNT, DSNT and BSNT. Weed occurrence was more serious in no-tillage soil, than that of tillaged soil. The rate of lower internode length was lower in DSNT and BSNT and was similar with MTT in PDSNT and MTNT. Height of center gravity in terms of lodging tolerance was lower in direct seeding than in machine transplanting. Depth of buried culm was shorter in no-tillage soil, especially in DSNT and BSNT. Total amount of root was higher in MTT, following MTNT, PDSNT, BSNT and BSNT and the distribution rate of root in shallower soil layer was higher in no-tillage soil, especially in BSNT and DSNT. Field lodging occured highly in BSNT, following DSNA, PDSNT and MTNT with high lodging scale in DSNT and BSNT. Panicle number per unit land square meter was the highest in MTT and the least in BSNT. Ripened grain ratio was low in BSNT and DSNT due to heavy lodging. Yield of milled rice was 93% in PDSNT, 87% in DSNT, 81% in BSNT and 96% in MTNT, compared with 534kg /10a in MTT.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.10a
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• pp.269-270
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• 2001

옥덩굴류(Caulerpa)는 청각목(Codiales)에 속하는 녹조류로 몸 조직은 낭상체로 되어 있으며, 난해산으로 열대 및 아열대에 많이 분포한다(Garcia et al., 1996). 옥덩굴류는 세계적으로 20여종 이상이 보고 되었으며 우리 나라에는 Caulerpa okamurae 1종만이 알려져 있다(강, 1968). 옥덩굴은 조직이 부드럽고 다육질이며, 형태와 색깔이 아름다워 신선한 야채 또는 샐러드 형태의 식품으로 이용될 수 있어 식량자원으로서 개발 가능성이 크다. 또한 난해산으로 김과 미역의 양식이 되지 않는 고수온기에 재배할수 있어 해조류 양식의 효율성을 피할 수 있을 것으로 보인다. (중략)

• KOREAN JOURNAL OF CROP SCIENCE
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• v.29 no.2
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• pp.191-197
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• 1984

This study was conducted to investigate the flowering habit for the botanical types of peanut (Arachis hypogaea. L) in cultural limiting region. Eight peanut varieties pertaining to virginia, Spanish, Valencia, Shinpung type were used in this study. Shinpung type, a new erect type was developed at Crop Experiment Station, ORD. Appearance of the first flower of peanut plants is observed at a relatively early growing stage. Number of days to first flower were 41 days under vinyl-mulching while non-mulching culture took 55 days. Number of days to first flower were delayed in order of Valencia, Spanish, Shinpung, Virginia type. Flowering durations were distinguished among botanical types and days of those were Virginia 85-93, Spanish 101-105, Valencia 106-113, Shinpung 82-88 days, respectively. The Spanish and Valencia types produced more flowers than Virginia and Shinpung types. The maximum flowering stage of Shinpung and Virginia types reached early and ceased by one cycle, while Spanish and Valencia types came late and showed maximum stage through the early and late stage during the growth stage. By vinyl-mulching, the maximum flowering stage was shortened by 20 days than that of non-mulching. Distribution of flowers for each of branch positions to total flowers occupied 52-53% in two cotyledonary branchs, 23-27% in 3rd to 5th branchs, 20-25% in over. 6th branchs. Shinpung type was considered more favorable botanical type than the other types for the breeding of early maturing high yielding variety because of shortening of days to first flower, flowering duration and distribution of lower branch of effective flowers.

• Korean Journal of Soil Science and Fertilizer
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• v.30 no.1
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• pp.35-40
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• 1997

This study was conducted to investigate methane emission under different rice cultural practices in paddy soil (Jeonbug Series, occurring on fluvio-alluvial plain). The rates of application of fresh rice straw were 5,000kg/ha in combination with 110 and 160kg N/ha as chemical fertilizer. The methane emission among the rice cultural practices was in the order of transplanting cultivation, direct seeding on flooded surface and direct seeding on dry paddy field. The average methane flux was $10.27mg/m^2/h$ in direct, seeding on dry paddy field and $24.1mg/m^2/h$ in transplanting cultivation. The diurnal variation of methane emission at heading stage was high from 9 a.m. till 7 p.m. and the methane emission rate was highly correlated with air temperature fluctuation and soil Eh. The seasonal change of methane flux was high from ear formation stage to heading stage.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.30 no.1
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• pp.63-68
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• 1985

This study was conducted to investigate the dry matter production and distribution ratio of dry matter produced for each of 5 botanical types (Virginia-Small Seed, Virginia-Large Seed, Spanish, Valencia, Shinpung) of Peanut (Arachis hypogaea L.) in Peanut culture limiting region. The total dry weight increased in order of Virginia-Large seed, Virginia- Small Seed, Shinpung, Spanish, Valencia type. The maximum Crop growth rates (Cmax) were Virginia-Small seed 18.22-23.41 g/㎡/day, Virginia-Large seed 19.61-20.03 g/㎡/day, Shinpung 16.33-19.77 g/㎡/day, Spanish 13.86-16.28 g/㎡/day, Valencia 13.97-16.25g/㎡/day, respectively. LAI showed the high value at vinyl-mulching than non-mulching. In the early filling stage, distribution ratio of dry matter produced showed the highest at the shinpung type than the other types.

• Proceedings of the Korean Society of Crop Science Conference
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• 1990.05a
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• pp.40-41
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• 1990

• Proceedings of the Korea Information Processing Society Conference
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• 2023.11a
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• pp.792-793
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• 2023

본 연구는 최근 농촌 인구 및 농촌 물 부족으로 인해 대량 재배가 어려워 짐으로서, 물고기 양식과 수경 재배를 동시에 할 수 있는 시스템이 도입되고 있다. 수경재배 작물과 가정에서도 쉽게 구할 수 있는 물고기로 선정하여 연구를 진행하였다. 향후 이를 활용하여 가정에서도 쉽게 수경재배를 할 수 있는 이른바 "아쿠아포닉스" 시스템에 관한 연구이다.

• Spatial Information Research
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• v.3 no.1
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• pp.47-53
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• 1995

The weed survey in lowland rice fields through Korea was conducted in 1992 to determine a change of the weed communities based on different regions, soil types, planting methods, and cultural practices. GIS was applied to identify a spatial analysis of predominant weed species in specific region. On behalf of vegetatine analysis such as absolute and relative density, absolute and relative frequency, importance value, and summed dominance ratio(SDR), there was highly dominant with a perennial weed species, Eleocharis kuroguwai Ohwi over whole country. However, in particular it was most predominant at southem area of Gyunggi province in Korea. Thus, rice farmers of this area have to introduce a specific comperhensive control strategy against this predominant weed species.

• Korean Journal of Weed Science
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• v.5 no.2
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• pp.137-142
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• 1985

This experiment was conducted to know the difference in weed population in the five cropping patterns kept same for six years from 1976 such as ricebarley, potato-rice, pea-rice, rice-rye, and rice-fallow. More and many weeds were growing in single cropping field than double cropping field. Dominant weed species in pea-rice and potato-rice cropping patterns were M. vaginalis and S. hotarui, M. vaginalis and P. distinctus. Coefficient of similarity of the cropping patterns between pea-rice and potato-rice appeared higher than single cropping system. However, pea-rice and rice-fallow cropping patterns showed low coefficient of similarity.

• Korean Journal of Plant Resources
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• v.25 no.5
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• pp.586-590
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• 2012

This study was conducted to investigate the seedling cultivation methods of Ostericum praeteritum Kitag. The results are as follows ; Ostericum praeteritum transplanted from wild seedlings and seedling cultured in the open field grew quite well, but their bolting rate was higher than other seedlings resulting in low root production. Seedling cultured in tray pot of green house produced good quality root as 426 kg/10a indicating the most adequate seedling method for Ostericum praeteritum production. Main compounds of Ostericum praeteritum roots were found as oxypeucedanin and bisabolangelone, and contents of wild seedlings were lower than theirs of the other seedlings methods.