Abstract
This study was conducted to examine the effect of cool-season grass overseeding on the green period, turf quality and density in zoysiagrass lawn. Treatments were perennial ryegrass (PR) overseeding (60 g m-2) on medium-leaf type zoysiagrass, Kentucky bluegrass (KB) overseeding (20 g m-2) on medium-leaf type zoysiagrass and narrow-leaf type zoysiagrass, and no overseeding on medium-leaf type zoysiagrass. Overseeding of KB or PR effectively provided quality improvement of zoysiagrass lawn by extending green-period about one month in spring and two months in fall season. PR overseeding showed quick green cover within 2-3 weeks but decreased the quality of overseeded zoysiagrass lawn during the summer season. Whereas, KB overseeding showed slow green cover taking two to three month after seeding but provided stable and good turf quality throughout the years. KB or PR overseeding significantly increased the turf density of zoysiagrass lawn except the period of summer depression of PR. The ground coverage of cool-season grasses ranged from 30 to 80% with considerable seasonal variation. As a result, KB and PR have their strengths and weaknesses as an overseeding material. Thus, the use of KB and PR as a mixture would provide better overseeding performance in zoysiagrass lawn.
Acknowledgements
This study was supported by the joint research project of the Rural Development Administration, Republic of Korea (Project No. PJ 011254).
Figures & Tables
Effect of cool-season grass overseeding on the visual quality of zoysiagrass lawn over a two- year period. MLZ+KB OS: medium-leaf type zoysiagrass overseeded with Kentucky bluegrass at 20 g m; NLZ+KB OS: narrow-leaf type zoysiagrass (‘Semil’) overseeded with Kentucky bluegrass at 20 g m; MLZ+PR OS: medium-leaf type zoysiagrass overseeded with perennial ryegrass at 60 g m; MLZ (no OS): medium-leaf type zoysiagrass with no overseeding.
