• Title/Summary/Keyword: creeping

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The Growth Effects of Creeping Bentgrass by SCB(Slurry Composting and Biofilteration) Liquid Fertilizer application (SCB 저농도액비의 시용이 크리핑벤트그래스의 생육에 미치는 영향)

  • Ham, Suon-Kyu;Kim, Young-Sun;Park, Chi-Ho
    • Asian Journal of Turfgrass Science
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    • v.24 no.1
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    • pp.56-61
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    • 2010
  • This study was conducted to evaluate the effect of application of SCB liquid fertilizer produced after slurry composting and biofiltration (SCB) on turfgrass growth in golf course during 6 month period from May to October in 2008. The change of soil properties by applying CF and SCB was unaffected respective treatments. As compared with NF, turf color index of CF, S-1 and S-2 increased by 1.8%, 2.5%, and 3.4%, respectively and chlorophyll content by 13%, 19%, and 25%, respectively. Dry weight of S-1 and S-2 was increased by 15% and 26% than that of CF. As compared with CF, N uptake rate in S-1 and S-2 was increased by 21% and 37%, P uptake rate 57% and 28%, and K uptake rate 16% and 27%, respectively. S-2 showed the best effect for turf color index, chlorophyll content, dry weigh and nutrient uptake rate in creeping bentgrass. These results suggested that an mixed application of SCB and compound fertilizer was improved turf quality and growth of creeping bentgrass by increasing nutrient uptake rate of turfgrass.

Growth and Quality Changes of Creeping Bentgrass by Application of Liquid Fertilizer Containing Silicate (규산 함유 액상비료 시비에 따른 크리핑 벤트그래스의 생육과 품질 변화)

  • Kim, Young-Sun;Lee, Chang-Eun;Lee, Geung-Joo
    • Weed & Turfgrass Science
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    • v.5 no.3
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    • pp.170-176
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    • 2016
  • Superintendents have used a silicate fertilizer to improve a resistance of turfgrass against several diseases, drought damage and wear stress. This study was conducted to evaluate the effect of liquid fertilizer containing silicate (LFSi) on changes of turfgrass quality and growth by investigating visual quality, chlorophyll content-chlorophyll a, chlorophyll b, and total chlorophyll, root length, shoot length, dry weight of clipping, and nutrient content in leaves tissue. Treatments were designed as follows; control fertilizer (CF), SiF-1 (CF + $1ml\;m^{-2}$ LFSi), SiF-2 (CF + $2ml\;m^{-2}$ LFSi), and SiF-3 (CF + $4ml\;m^{-2}$ LFSi). As compared with CF, soil chemical properties, visual turfgrass quality, chlorophyll content, and dry weight of clipping of LFSi treatments were not significantly. Contrastingly, shoot density, root length, and the content of nitrogen or potassium were increased by application of LFSi. The content of Si in the tissue was positively correlated with potassium content or shoot length, and similarly shoot density positively with chlorophyll content or visual quality, respectively. These results suggested that the application of LFSi improved the turfgrass quality by increasing shoot density or K content in leaf tissue of creeping bentgrass.

Comparison of Spring Growth Characteristics of Creeping Bentgrass(Agrogtis palustris Huds.) Cultivars (봄철 크리핑 벤트그래스의 품종별 특성비교)

  • Lee, Hyung-Seok;Hong, Beom-Seok;Kim, Kyung-Duck;Tae, Hyun-Sook
    • Asian Journal of Turfgrass Science
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    • v.21 no.2
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    • pp.155-161
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    • 2007
  • This study was initiated to evaluate the growth characteristics of creeping bentgrass cultivars during the sprlng season. The green-up of 'CY' and 'T-1' were about 2 weeks earlier than the other cultivars followed by 'Penn A' 'Crenshaw', 'L> 'Penncross' > 'Putter' > 'Dominant' > 'SR1020' in that order. 'T-1' and 'CY-2' had the highest chlorophyll content while 'Penncross' had the lowest during the spring. 'Crenshaw' and 'Penn A-4' showed the highest shoot density in this research, followed by 'CY-2', 'L-93', 'T-1', 'Putter', 'Dominant', 'SR1020', and 'Penncross' in that order. In case of root length, 'CY-2' and 'L-93' were the best cultivars, but 'Penncross' was worst during the spring. 'CY-2' had the best visual quality among the cultivars, 'T-1' and 'Crenshaw' also classified as high visual quality group whereas 'SR1020', 'Dominant' and 'Penncross' were grouped in relatively low quality. In conclusion, 'CY-2', 'T-1' and 'Crenshaw' were the best cultivars in terms of growth characteristics in spring. Conversely, 'SR1020' and 'Penncross' were the poorest cultivars. These results can be more useful for management or constructing of golf courses. However, this research was performed with little compaction stress. More information is needed on the tolerance to compaction stress of these bentgrass cultivars.

Application of Depth Resolution and Sensitivity Distribution of Electrical Resistivity Tomography to Modeling Weathered Zones and Land Creeping (전기비저항 깊이분해능 및 감도분포: 풍화층 및 땅밀림 모델에 대한 적용)

  • Kim, Jeong-In;Kim, Ji-Soo;Ahn, Young-Don;Kim, Won-Ki
    • The Journal of Engineering Geology
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    • v.32 no.1
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    • pp.157-171
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    • 2022
  • Electrical resistivity tomography (ERT) is a traditional and representative geophysical method for determining the resistivity distributions of surrounding soil and rock volumes. Depth resolution profiles and sensitivity distribution sections of the resistivities with respect to various electrode configurations are calculated and investigated using numerical model data. Shallow vertical resolution decreases in the order of Wenner, Schlumberger, and dipole-dipole arrays. A high investigable depth in homogeneous medium is calculated to be 0.11-0.19 times the active electrode spacing, but is counterbalanced by a low vertical resolution. For the application of ERT depth resolution profiles and sensitivity distributions, we provide subsurface structure models for two types of land-creping failure (planar and curved), subvertical fracture, and weathered layer over felsic and mafic igneous rocks. The dipole-dipole configuration appears to be most effective for mapping land-creeping failure planes (especially for curved planes), whereas the Wenner array gives the best resolution of soil horizons and shallow structures in the weathered zone.

Changes in the Growth and Quality of Creeping Bentgrass (Agrostis palustris Huds. 'Penn A1') Following Gibberelinic Acid (GA3) Treatment (지베렐린산(GA3) 처리에 따른 크리핑 벤트그래스 (Agrostis palustris Huds. 'Penn A1')의 생장 및 품질 변화)

  • Woo-Sung Kim;Tae-Wooung Kim;Young-Sun Kim;Chi-Hwan Lim
    • Korean Journal of Environmental Agriculture
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    • v.42 no.4
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    • pp.389-395
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    • 2023
  • This study evaluated the effects of gibberellic acid (GA3) on the growth and quality of creeping bentgrass (Agrostis palustris Huds.). Experimental treatments included a No application of fertilizer and GA3 (NFG) Control [3 N active ingredient (a.i.) g/m2], 0.3GA3 (GA3 0.3 a.i. mg/m2/200 mL), 0.6GA3 (GA3 0.6 a.i. mg/m2/200 mL), 1.2GA3 (GA3 1.2 a.i. mg/m2/200 mL), and 2.4GA3 (GA3 2.4 a.i. mg/m2/200 mL). Additionally, the study included a 1.5N+GA3 experiment with similar GA3 treatments combined with 1.5N a.i. g/m2 : NFG, Control (3N a.i. g/m2), 1.5N+ 0.3GA3 (1.5N a.i. g/m2+GA3 0.3 a.i. mg/m2/200 mL), 1.5N+0.6GA3 (1.5N a.i. g/m2+GA3 0.6 a.i. mg/m2/200 mL), 1.5N+1.2GA3 (1.5N a.i. g/m2+GA3 1.2 a.i. mg/m2/ 200 mL), and 1.5N+2.4GA3 (1.5N a.i. g/m2+GA3 2.4 a.i. mg/m2/200 mL). Compared to the NFG, turf color index chlorophyll content was not significantly different (p< 0.05). However, shoot length in 1.2GA3, 2.4GA3, 1.5N+0.3GA3, 1.5N+0.6GA3, 1.5N+1.2GA3, and 1.5N+2.4GA3 treatments increased by 0.8%, 10.6%, 5.15%, 8.3%, 13.5 %, and 21.6%, respectively, compared to the control. As compared to the control, clipping yield in 1.5N+1.2GA3 and 1.5N+2.4GA3 treatments increased by 7.1% and 14.3 %, respectively. These results indicated that GA3 application increased shoot length, with the 1.2GA3 treatment showing shoot length similar to the control (3N a.i. g /m2 ).

부식산을 포함하는 생육활성촉진제가 잔디 및 수목 생육에 미치는 영향

  • 김용선;고석구
    • Proceedings of the Korean Environmental Sciences Society Conference
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    • 2002.05b
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    • pp.422-425
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    • 2002
  • Application of biostimulants, humate-based products marketed as aids to plant establishment, may increase root growth of turfgrass and maple tree. We tested three types of biostimulants on root growth of creeping bentgrass (Agrosfic palustris Huds.) and maple (Acer rubrum L.). Roots were first observed in the 2-3 weeks after treatments. Biostimulant-treated tufgrass and tree had more root length than nontreated controls. Turfgrass nutrient absorption was increased with biostimulant application.

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A Computational Study on Creep-Fatigue behavior of Weld Interface Crack (용접 계면균열의 크리프-피로 거동에 대한 수치해석적 연구)

  • 이진상;윤기봉
    • Proceedings of the KWS Conference
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    • 2000.04a
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    • pp.264-266
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    • 2000
  • In this study, analysis of creep-fatigue behavior of low alloy steel weld was performed. An interface was employed along the crack plane to simulate the interface between base metal and weld metal. A trapezoidal waveshapes was loaded cyclically and analysis result was compared with that of monotonic load. The material was assumed as elastic-plastic-secondary creeping material. Because the isotropic hardening plasticity model used in the last study cannot simulate the behavior of material under cyclic load, the linear kinematic hardening plasticity model was used. The behavior of strain field and $C_{t}$ parameter was obtained.d.

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New Species of Genus Coeloplana (Ctenophora: Tentaculata: Platyctenida) from Korea

  • Song, Jun-Im;Hwang, Sung-Jin
    • Animal Systematics, Evolution and Diversity
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    • v.26 no.3
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    • pp.217-221
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    • 2010
  • Since November, 2006, the new creeping platyctenid ctenophore, Coeloplana anthostella n. sp., has been collected from twigs and polyp masses of encrusting dendronephthyans at a depth of 26-32 m off the coast of Munseom, Jejudo Island. This new species is distinguished from C. bocki Komai, 1920 and C. komai Utinomi, 1963 by its smaller size, the absence of dorsal papillae, and the deep scarlet colored star-shaped markings on the dorsal plane. This novel addition to ctenophore fauna is presently described and illustrated in detail.

Comparison of Nondestructive and Destructive Tests in High Voltage Motor Stator Windings (고압전동기 고정자 권선에서 비파괴와 파괴시험의 비교)

  • Ju, Young-Ho
    • Proceedings of the KIEE Conference
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    • 1999.07e
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    • pp.2097-2100
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    • 1999
  • Nondestructive and destructive tests were performed the stator windings of three high voltage motors prior to the rewind. Nondestructive tests included ac current increase rate($\Delta$I), dissipation factor(${\Delta}tan{\delta}$), and maximum partial discharge(Qm) The destructive tests included breakdown at three phases with ac voltage. Flashover occurred between the connected winding of endwinding and the stator flame. In two cases creeping discharge occurred between the individual phase windings and the wedges In the stator ends. The results of destructive tests could rarely be determined the breakdown voltage.

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