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Frontiers of Agriculture in China

ISSN 1673-7334

ISSN 1673-744X(Online)

CN 11-5729/S

Front Agric Chin    2009, Vol. 3 Issue (2) : 186-189     DOI: 10.1007/s11703-009-0038-6
Growth responses of Kentucky bluegrass (Poa pratensis L.) to trinexapac-ethyl applied in spring and autumn
Guangyu FAN, Xiuju BIAN(), Huibin LI, Zhao MENG, Shengyao LIU
1College of Agronomy, Agricultural University of Hebei, Baoding 071001, China
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The practices with low clippings production to save time, money, or landfill space, were favored by turf managers. Understanding the responses of Kentucky bluegrass (Poa pratensis L.) to Trinexapac-ethyl (TE) would facilitate recommendations regarding its safe and effective use in Northern China. The objectives of this study are (1) to investigate the effects of TE on vertical growth, clipping yield, leaf width, and chlorophyll content of Kentucky bluegrass, and (2) to compare the seasonal application impacts of TE. Both spring and autumn experiment results demonstrated that Trinexapac-ethyl applied to Kentucky bluegrass suppressed the vertical grass growth and significantly reduced the Kentucky bluegrass clippings production within a few weeks after initial treatment. Applied trinexapac-ethyl enhanced Kentucky bluegrass leaf width in both spring and autumn experimental periods. Discoloration on leaf tips was observed and lasted for four weeks when the same TE rate of 0.191 mL?m-2 was applied in early autumn. Darker leaves with higher chlorophyll content compared with non-TE-treatments appeared after the initial four weeks of the treatment in autumn and the treatment for the entire spring.

Keywords Kentucky bluegrass      trinexapac-ethyl      clipping yield      leaf width      chlorophyll content     
Corresponding Authors: BIAN Xiuju,   
Issue Date: 05 June 2009
URL:     OR
Fig.1  Effects of trinexapac-ethyl on Kentucky bluegrass height
TE treatmentweeks after initial application
CK50.99 a29.12 a27.42 a38.89 b48.12 a35.16 a34.27 a22.03 a
TE27.37 b14.99 b26.54 a48.93 a36.64 b21.32 b29.19 a23.04 a
Tab.1  Clippings dry weight after TE application (g?m)
Fig.2  Effects of trinexapac-ethyl on Kentucky bluegrass leaf
Fig.3  Effects of trinexapac-ethyl on Kentucky bluegrass
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