• Asian Journal of Turfgrass Science
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• v.3 no.1
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• pp.16-23
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• 1989

입화(Burning)가 zoysia-82의 생육, 종자생산 및 thatch 감소에 미치는 효과를 조사한 결과는 다음과 같다. 1. 유초출현일수는 대비구(자연상태)와 유초출현 약 2개월전에 입화처리한 구가 짧았다. 2. 종자수량은 대비구가 가장 많았고 휴면직전과 유초출현직후의 입화구가 가장 적었다. 3. Thatch 축적은 대비구가 가장 깊었으며 휴면직전과 휴면 약 2개월 후 입화처리구가 가장 얇았다. 4. 근건중, runner 건중, 총 건물중은 휴면 약 2개월후 입화구가 가장 무거웠으며, 엽 및 엽경건중은 휴면직후의 입화구가 가장 무거웠으나 근건중 이외의 형질들은 입화처리간 유의차가 없었다. 5. Zoysia-82의 유초출현일수의 단축과 종자수량의 증가및 thatch 감소를 위해서는 유초출현 약 2개월전과 휴면 약 2개월후가 입화적기라 사료된다.

• Asian Journal of Turfgrass Science
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• v.3 no.2
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• pp.83-88
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• 1989

This Study was designed to know the growth Status under various photoperiod using Zoysia matrella. The experimental plots were split into such groups as control (full sunlight) 3hour, 6hour and 9hour photoperiod by three replication of completely randomized design. Chlorophyll content was analyized by mackine method and total soluble sugar by anthrone method. The result obtained from this experiment was as fol1 lows ; l. Dry weight was high in the control and 9hour plots. Its decrease remarkably occured in the short day plots 2. Leaf growth woes remarkaly decreased by short day condition. Six hour was considered as critical duration for leaf growth. 3. The growth of rhizome in the 9hour and control plots was good. New development of rhizome in the' short day plots was very slow compare to the control plot. 4. Chlorophyll content was high at l8 days after transplanting and then decreased. Its content in the short day plots severely decreased. 5. The content of soluble sugar in the control was low at early growth stage and high at late growth stage. It was found that the shorter the exposure time to sunlight, the higher the ratio of sugar content.

• Asian Journal of Turfgrass Science
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• v.8 no.1
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• pp.29-36
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• 1994

We studied on the mineral nutrients and productivity of grasslands in Kimhwa. The vascular flora of grasslands in Sakok-ri, Wasoo-ri, and Yukdan-ri located at Kimhwa were composed of 39, 28, and 32 species respectively. The most important species were Arundinella hirta and Miscanthus sinensis These two species contributed greatly to the standing crops of live material which was in excess of $146.47g/m^2$ throughout the growing season. The daily production throughout the growing season was in excess of $1.04 g/m^2$. Factors which affected the daily productivity of grasslands in Kimhwa were phosphours and water content.

• Asian Journal of Turfgrass Science
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• v.9 no.1
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• pp.53-74
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• 1995

This study was made on the relationships among production structures, biomass and Soil proper-ties of grassland types in Chejudo. The results of this investigation were obtained as foolows. The annual productions of the grasslands of Zoysio, Imperata, Themede, Miscanthus and Pteridium types were 40.36~144.00, 168.28~272.44, 58.24~138.44, 156.12 ~714. 12 and 157. 18~398.40g /m$^2$, respectively. The production structures of those grassland types were different from one another. The water contents, organic matter, total nitrogen and available phosphorus were different levels between grasslands had a simple correlation at 5% level and the organic matter contents were a higher significant at the partial correlation. Key words: Production Structure, Biomass, Soil properity, Chejudo.

• Asian Journal of Turfgrass Science
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• v.9 no.3
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• pp.225-234
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• 1995

The Widespread and most abundant grasses are Miscanthus sinensis and Pteridium aquilinum in the grassland of Cheju-Island. The vascular flora of the grassland are composed of 127 species in all. Those communities of Miscanthus sinensis Pteridium aquilinum Imperata cylindrica Themeda japon-ica and Zoysia japonica are relatively homogeneous. Standing crops of the mixed grass communities range from 657 g /$m^2$ to 2, 975 g /$m^2$ on August 30, and the value of daily net production is around 2.6~121 g/$m^2$. The standing crop of north facing slop showed higher than that of south facing slop. Relationship between the standing crop and water content, organic matter, total nitrogen and available phosphorus of soils in Cheju-Island showed high level of significant.

• Weed & Turfgrass Science
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• v.6 no.4
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• pp.306-312
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• 2017

This study was carried out to develop new hybrid zoysiagrass cultivar 'Seah' (The application no. for cultivar protection : 2014-22). Native zoysiagrasses were collected from south-west seaside of Korea from 2010 to 2011. Artificial crossing was conducted to develop F1 hybrid between Z2011 (Z. sinica) and NM1 (Z. matrella) at plastic house in 2011. Among the progenies, 'Seah' showed fine leaf texture and high shoot density from the space planting plots at field. 'Seah' showed genetically light green color, with fine leaf with 1.8mm and height to the lowest leaf blade was 1.94 cm. Ground coverage rate was slower than medium leaf zoysiagrass (Jung-gi), but plant height of 7.1 cm was the lowest among the compared zoysiagrasses and height to lowest leaf of 1.94 cm was lower than most zoysiagrass, which may allow low mowing height.

• Asian Journal of Turfgrass Science
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• v.25 no.2
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• pp.217-222
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• 2011

Professional turfgrass applicators have reduced or eliminated phosphorus from their fertilization programs based on the assumption that soil phosphorus levels are supplying adequate amounts of phosphorus to the turfgrass. The previous researchers found that there were no P effects for turfgrass growth especially for mature turf. No effects may result from high P level in heavy thatch layer. The research was conducted for one year to investigate the effects of phosphorus fertilization programs on turfgrass performance, and monitor soil and plant tissue nutrient levels to determine the impact of the programs on a newly seeded Kentucky bluegrass. The nitrogen treatments were 20, 30 and $40g\;m^{-2}\;yr^{-1}$. The low, medium, and high nitrogen treatments were applied over 2, 4 and 6 applications, respectively. Nitrogen was applied using a formulation containing 30% of slow and 70% of fast release nitrogen sources that are representative of typical home lawn fertilizers. The phosphorus treatments were 0, 10 and $20g\;m^{-2}\;yr^{-1}$. Phosphorus was applied according to the application schedule for the nitrogen treatments. Kentucky bluegrass was seeded in May, 2010. The thickness of thatch layer was less than 1 cm and the first treatment was applied to Kentucky bluegrass in April, 2011. The low N rate treatment had acceptable color and quality ratings without high clipping yields. The high N rate treatment consistently had the highest color and quality ratings but also had very high clipping yields in comparison to the low and medium N rate treatments. Although there are significant differences in tissue P, Overall, there was no effect of phosphorus on color, quality, or clipping weights.

• Horticultural Science & Technology
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• v.33 no.4
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• pp.492-500
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• 2015

Our previous report demonstrated successful isolation of soil-borne bacteria that suppressed the potential of Rhizoctonia solani AG2-2 (IV) causing turfgrass large patch disease when applied to Korean lawngrass (Zoysia japonica). The current study aimed to uncover the mechanisms of this antagonism of Rhizoctonia solani and to define culture conditions for the isolated microbes. We found that two Bacillus isolates, I-009 and FRIN-001-1 strains, produced cellulase and siderophore, but not chitinase, while the Pseudomonas YPIN-022 strain was found to release only siderophore, implying that three antagonistic bacteria commonly interrupt Fe uptake by the large patch pathogen. The I-009 and FRIN-001-1 isolates grew best at 35 and $30^{\circ}C$ in growth medium of pH 5 to 8 for 32 and 28 h, respectively, while optimum growth for the YPIN-022 strain was found at $35^{\circ}C$ at pH 5 to 9 for 24 h. Good growth of I-009 and YPIN-022 over 24 h was obtained in M9 minimal medium supplemented with 1% sucrose, 0.5% yeast extract and 0.1% potassium chloride. FRIN-001-1 grew well in M9 medium with 1% mannitol, 0.5% yeast extract and 0.1% potassium phosphate dibasic.

• Korean Journal of Weed Science
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• v.31 no.2
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• pp.205-211
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• 2011

• Asian Journal of Turfgrass Science
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• v.25 no.2
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• pp.171-176
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• 2011

Sclerotinia homoeocarpa, the causal agent of dollar spot, is one of the most common pathogens of cool season turfgrasses in South Korea. The vegetative compatibility group (VCG) assay was carried out using nitrate-nonutilizing (nit) mutants recovered from 13 South Korean isolates with various geographical origins. The mutants were divided into four phenotypic classes based on mutation loci associated with nitrogen assimilation: nit1, nit2, nit3, and NitM. The recovered number of nit mutants greatly varied among the isolates, ranging from 0 to 15 mutants. Of the mutants isolated, nit1 and nit2 mutants were most common (80%) while NitM and nit3 were relatively rare. One dominant and four minor VCGs were determined from 18 mutant isolates tested. To study population structures of Korean S. homoeocarpa isolates and increase our understanding of its ecological and epidemiological aspects for dollar spot management on turfgrass, more generated mutants should be tested with more diverse isolate collections.