• Asian Journal of Turfgrass Science
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• v.19 no.2
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• pp.103-113
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• 2005

This study was conducted to improve the green up of zoysiagrass(2. japonica) and cool-season grass($80\%$ Kentucky bluegrass+$20\%$ Perennial ryegrass) during early spring in Korea. Treatments fur zoysiagrass were control, Polyethylene film, Black screen, Black screen+polyethylene film, Green screen+polyethylene film, Polyethylene film+Black screen, Polyethylene film+Green screen, low mowing height(1.5-2cm) and homing. For cool-season grass, non-punched Polyethylene film, punched Polyethylene film treatments were included. Application dates of covering with Polyethylene film were Feb. 22, Feb. 28, March 7, and March 14. Green up was evaluated by visual color rating. The results are as follows; 1. The best method for improving green up of zoysiagrass were Polyethylene film and optimal covering day for zoysiagrass was on Feb. 22. 2. Low mowing height(1.5-2cm) and burning of zoysiagrass showed the faster greening 1$\sim$weeks before than control. .3 Non-punched Polyethylene film covering was best to improve green up of cool-season grass. More time of covering time with cool-season grass induces rapid green up.

• Weed & Turfgrass Science
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• v.2 no.2
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• pp.198-201
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• 2013

This study was carried out to develope new zoysiagrass cultivar Semil' (Registration no. 1749). Artificial crossing between the collected lines of typical Z. matrella, NM1 (collected in South Korea) and the different ecotype of Z. matrella, ASm (collected in South Korea) was made to develop a F1 hybrid plant (NM1 ${\times}$ ASm). Among the 30 progenies, (NM1 ${\times}$ ASm)-1 (Semil) showed superior performance in density rating. 'Semil' showed genetically light green color, with narrow leaf width ($2.7{\pm}0.12mm$), and low plant height ($10.3{\pm}3.7cm$), Length to lowest leaf blade of this cultivar was $1.8{\pm}0.15cm$, which may allow low mowing height upto 12 mm.

• Asian Journal of Turfgrass Science
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• v.21 no.2
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• pp.177-182
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• 2007

When a football field is constructed using sand medium, the fertilizer management has to be adjusted because of the low nutrient holding capacity and higher leaching rate. The objective of this study was to test the effects of slow release fertilizers on Kentucky bluegrass (Poa pratensis L.) growth in simulated sport field rootzones with PVC pipe pots. Data of turfgrass color, uniformity, growth rate, biomass above ground, and the nitrate content in the leaching solution was collected at different growing stages and during four simulated rain fall periods. The result showed that the nutrient release rate of urea was the highest and that of controlled release nitrogen fertilizer was the lowest. Effects of the controlled release nitrogen fertilizer lasted 14 days more than other lawn fertilizers and 28 days longer than regular urea with acceptable quality levels of turf. The slow release fertilizer also restrained excessive growth of the grass, reduced the times of mowing. Slow release fertilizer used in this study reduced $NO_3$-N leaching by almost 50% at the beginning of turf establishment.