• 한국조경학회지
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• 제18권2호
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• pp.45-55
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• 1990

비탈면에 초목식생이 도입되면 훼손된 인위비탈명의 지표면 녹화를 이룰 뿐 아니라 비탈면의 지표면유거수의 거동에 상당한 영향을 미치어 토양표층의 면상침식이나 불안정한 상태의 토사유출의 억제에 상당히 효과적이며, EH한 토층 깊숙이 뿌리를 내리는 일부 식물에의해서는 표층분양의 만지에도 상당한 효과를 지닌다고 불수 있다. 본 연구의 결과 이러한 기능들에 대한 식물들의 효과들이 상대적으로 비교될 수 있었으며, 이들을 혼파처리시 변화되는 경관의모습을 예측할 수도 있었다. 주요 실험내용별 연구결과를 요약하면 다음과 같다. 1.초기조성속도 외래도입초종들 중에서 한지형 잔디들이 우수하였으나 여름철을 지나면서 부터는 그 세력이 급격히 약화되었다. 반대로 난지형잔디들과 자생식물들은 초기조성속도는 느리나 dufmadfm 지나면서 왕성한 생육을 함으로써, 혼파처리시에 이러한 식물들의 장 . 단점을 이용하는 것이 바람직한 것으로 판단된다. 2. 초종별지성부 및 지하부이 생장량을 비교 분석한 결과 지상부는 Weeping lovegrass 와 쑥 등의 건중량이 많았으며, 지하부의 생장에 있어서는 쑥의 건중량이 가장 많은 것으로 나타났으며, 그 다음이 Weeping lovegrass, 비수리, Creeping redfescue 등이었다. 또한 외래도입토종중 Creeping redfescre와 Tall fescue는 지하부와 지상부의 발달이 비교적 균형을 이루고 있었으며, 식근성 뿌리구조를 지닌 비수리는 비록 근중량은 쑥보다 적으나 깊이 뿌리가 형성 되는 특징이 있었으므로 지표면붕양에는 가장 억제효과가 있는 식물로 생각된다. 3. 초종별 뿌리의 전단력을 조사한 결과 초기에는 Italian ryegrass가 우세하였으나 시간이 경과하면서 부터는 Weepihg lovegrass, 비수리, 쑥 등의 뿌리 전단력이 증대되는 것으로 나타나 이들이 혼합된 혼파처리구들은 높은 측정치들을 기록하였다. 따라서 초기에 조성속도가 빠른 한지형잔디들이 지표면을 피복하도록 하고 여름의 고온기와 장마시기에는 뿌리전단력이 우수한 이러한 초종들로 지표면이 피복되도록 하는 것이 이상적이라 생각된다. 4. 혼파처리간의 토사유출량을 비교한 결과 토사 유출 억제효과는 한지형과 나지형잔디들의 혼합형(MixtureIII)과 자생처리구(MixtureV), Italian ryegrass와 자생식물의 혼합형(MixtureIV)등에서 비교적 낮은 수치를 토사유출량을 기록하였다. 이러한 결과는 자생식물들이 비록 초기생육속도는 외래도입초종에 떨어지지만 토사유출의 억제효과면에서는 이들 외래초종에 필적할 수 있음을 나타낸다고 할 수 있겠다.

• Journal of Ginseng Research
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• 제22권3호
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• pp.161-167
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• 1998

American ginseng plants (Panax quinquefolium L.) of various ages were harvested every two weeks during each of three growing seasons and dry matter yield of components and root respiration determined. Shoot dry weight was about 0.5 g, 2.5 g and 4 g for 2, 3 and 4-year-old plants, respectively and fruit dry weight was as much as 50% of this in 3- and 4-year-.old plants. Root dry weight decrease by 30~50% as shoots emerged and at the end of the season was about 2 g, 3.5 g and 5 g in 2, 3, 4 and 5-year-old plants, respectively. Shoot and root dry weight were linearly related with an approximate 1:2 ratio. Root respiration rate at 2$0^{\circ}C$ in the dark was about 5 $\mu\textrm{g}$ CO2 g-1 DW(dry weight) min-1 in the early season, then doubled within 50 days as shoots emerged, and thereafter declined over the season to 2~5 $\mu\textrm{g}$ CO2 g-1 DW min-1. The Q10 for dark respiration over the interval from 10 to 2$0^{\circ}C$ was 1.58. Root respiration rate and shoot growth rate was positively linearly related in all ages of plants. Key words: Dry weight, partitioning.

• 아시안잔디학회지
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• 제5권1호
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• pp.23-32
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• 1991

The purpose of this study was to determine the vegetative growth of two cool season turfgrasses during summer season in Korea. Ten respective cultivars of Kentucky bluegrass [Poapratensis L.] and perennial ryegrass [Lolium perenne L.] were exposed to unshaded, 30% and 60% shade for 4odays. First mowing height was 7cm, and then clippings were harvested every ten days at the same height. Shading increased the total length of clippings of all cultivars of two turfgrasses, but fresh and dry weight were significantly decreased. The highest shoot length obtained at 30% shade in Kentucky bluegrass and at 60% shade in perennial ryegrass. 'Rugky', 'Sydsport', 'Wabash' and 'Baron' of Kentucky bluegrass and 'Repel', 'Omega II', 'Ovation', 'Linn', 'Bell' and 'Manhattan' of perennial ryegrass showed relatively high tolerance to shade. Especially, in 'Citation II' perennial ryegrass, fresh and dry weight were increased by 30% shade. The number of tillers generally decreased with increasing shade. In 30% shade, 'Midnight' Kentucky bluegrass and 'Omega II' perennial ryegrass were least reduced and 'Baron' Kentucky bluegrass and 'Pennant' perennial ryegrass were most reduced. The cultivars of lower growth habit in full sunlight showed shade tolerance compared to those of higher growth habit.

• 한국조경학회지
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• 제28권4호
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• pp.1-8
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• 2000

This study is conducted to evaluate the effects of root restriction on growth of maple(Acer palmatum Thumb.). Tow types of container such as clay pot(CP), root control bag(RCB) were used to restrict maple's root and each type of container was divided into 5 sizes. The containers with plants were buried just below the soil level and maples planted directly in the soil (nonrestricted root treatment) were included as comparison. Data were collected on dry weight of leaf, trunk, thick root, rootlet and soil water potential. We have analyzed, simple linear regression, Pearson's Correlation analysis, Duncan's multiple rang test, and Covariance Analysis using SAS statistical software. The results of analysis based on these data are as follows; 1. Total dry weight of maple in CP was significantly larger than in RCB. 2. Difference in growth reduction by the kinds of containers was induced by different hydraulic diffusion ratios between container and soil. Difference in growth reduction by the size of container was induced by the difference density of rootlet and soil moisture contents in the container. 4. Commercial products of root control of root control bag appeared not proper for countries in which fluctuation of rainfall is severe. Because maples in RCB were restricted by excess soil water in the rainy season, or by lack of soil water in the dray season.

• 한국연초학회지
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• 제22권1호
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• pp.61-70
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• 2000

This study was carried out to improve the tobacco field condition and to determine the effect of lime amount and application time on soil pH, yield, and quality of leaf tobacco. Lime was applied to the tobacco field by determined amounts according to different pH level. The changes of soil pH, growth of tobacco, yield, and quality of KF109 and Br21 tobacco were surveyed by time lapse. The target pH value in tobacco field soil can be reached at 6 weeks after lime application, and then the soil pH was lowered slightly after that time. The lime amount needed to reach target pH was decreased 40 % in the same tobacco field after 1 year. Though the initial growth rate of flue-cured tobacco in the field of pH 7.0 was lower than that of conventional tobacco field, the field of pH 7.0 showed the highest yield after the maximum growth stage. The quality of cured leaf tobacco in the field of pH 7.0 applied lime at spring season was slightly lowered compared with that in conventional. This results indicated that the best pH condition in tobacco field for the best tobacco growth was 6.5 and the proper time of lime application was fall season of previous year by application of the whole quantity.

• International Journal of Advanced Culture Technology
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• 제11권2호
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• pp.375-380
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• 2023

The study was conducted in Manu-stream, located in Paju, Gyeonggi-do, from January 2021 to December 2021. The survey points were selected in the upper and lower streams based on where thermal discharged to investigate water temperature and fish species and biological community analysis and growth rate were analyzed. The average annual water temperature difference between the upper and lower stream is about 11.0℃, and in the case of the lower stream area, the water temperature is maintained at 20.0℃ or more per year. Fish that appeared during the survey period decreased lower stream compared to the upper stream, which is believed to be the result of a decrease in temperature-sensitive species as the simple riverbed structure and water temperature increased compared to the upper stream. As a result of biological community analysis, it showed a relatively stable community state at the upper stream. The growth rate of fish has a high regression coefficient b value in lower streams throughout the four seasons. It showed relatively good growth lower stream, with a high water temperature. However, the results of each survey point are similar from season to season. The indicator species is a resistant intermediate species, and the range of resistance to water temperature is wide, so it is judged that water temperature's effect on the indicator species' growth is low.

• 한국환경농학회지
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• 제32권4호
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• pp.332-337
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• 2013

신간척지에서 청보리의 안정재배를 위한 토양 염농도를 제시하기 위하여 새로 조성된 새만금간척지에서 토양염농도(EC) 0.8, 3.1, 6.5, 11.0 dS/m에 해당하는 지점을 선정하고, 화학비료로 $N-P_2O_5-K_2O$=150-100-100 kg/ha를 시용한 후 2011년 10월 26일에 영양보리를 220kg/ha 파종하였다. 재배기간중 토양 염농도는 수확기>출수기>파종기>월동기 순으로 파종기에 비해 수확기에 1.4~4.2배 상승하였다. 염농도가 높을수록 발근에 지장을 초래하여 지상부 생육도 저조하였고 특히 EC 11.0 ds/m에서 출현은 하였으나 겨울철이 지난 후 고사하였다. 수량은 토양염농도 0.8 dS/m(8.8 MT/ha)에 비해 3.1 dS/m과 6.5 dS/m에서 각각 68 %, 35 % 수준이었다. Proline함량은 생육초기가 수확기보다, 그리고 염농도가 높을수록 많았다. 수확기의 $Na_2O$와 MgO 함량은 염농도가 높을수록 많았고 N, $P_2O_5$, $K_2O$ 및 CaO 함량은 염농도가 높을수록 적었다. 따라서 토양 염농도가 3.1 dS/m이상으로 높아짐에 따라 청보리의 지하부와 지상부에 심각한 생육저해로 양분의 불균형 흡수를 초래하여 수량이 저조하기 때문에 안정한 청보리 생산을 위해서는 지하 배수시설 또는 관개수를 이용하여 3.1 dS/m이하로 염농도를 떨어뜨린 후 재배하는 것이 바람직할 것으로 판단된다.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.222-222
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• 2017

This study aimed to determine an optimal temperature of root zone for the chive cultivation in a greenhouse during the winter season that may raise the possibility of chive (Allium schoenoprasum L.) harvest any time year-round by reducing energy consumption. The maximum and minimum temperatures of root zone were 26.8 and $19.8^{\circ}C$ for the R-Z20, 28.3 and $23.6^{\circ}C$ for the R-Z25 and 22.4 and $14.3^{\circ}C$ for the control. The highest fresh weights of shoot and root, plant height, root length and stem diameter were observed in the R-Z20 treatment. There was no significant difference in the growth between the R-Z25 and control treatment. These results suggest that the optimal temperature of root zone is $20^{\circ}C$ for the chive cultivation in the greenhouse during winter season.

• 한국초지조사료학회지
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• 제16권4호
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• pp.291-298
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• 1996

This study was carried out at Crop Experiment Station in 1993 and 1994. The objective of this study was finding out variation of growth and yield of corn according to maturity. Hybrids of corn used in this study were early maturing corn Comet80, Elite90, Royaldent IOOT, Royaldent T$\times$llO, P3525, P3394, medium maturing corn Royaldent 120T. and late maturing corn Jungbuok, P3144W. G4743. Stalk height, leaf number, ear weight, stover weight, and TDN yield of early maturing corn were linearly increased with prolonged maturity in 1993 growing season. Leaf number, and stover weight of early and late maturing corn were linearly increased with prolonged maturity in 1994 growing season. But ear weight of late manuring corn was not increased as much as that of early manuring corn with prolonged maturity. Increase of total DM and TDN yield of late maturing corn was due to stover weight increase compared with ear weight increase of early maturing corn. Leaf number and stover weight were highly correlated with silk (Growing Degree Days) GDD.

• Journal of Ginseng Research
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• 제9권2호
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• pp.146-153
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• 1985

This study was conducted to know the effect of vinyl mulching from the sowing to germination on the seedbed for germination and production of seedling. Embryo growth was restrained with decreasing the water content in seed and stopped below 10% water content. Germination was possible over 55% water content but radicle growth was stopped at 55% water content. Ratioes of embryo / emdosperm length were about 50% at seeding time, and about 80% at just before freeing season, and the ratio was increased from the thawing season again. Vinyl mulching increased the soil water content and soil temperature. Germination rate and number of available seedling in vinyl mulching were increased 10% and 12%, respectively.