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Habitat delineation of green and false-green kyllinga in turfgrass systems and interrelationship of elevation and edaphic factors

Published online by Cambridge University Press:  20 January 2017

J. Scott McElroy ,
Fred H. Yelverton ,
Michael G. Burton  and
Cavell Brownie
Fred H. Yelverton
Affiliation:
Crop Science Department, North Carolina State University, 4401 Williams Hall, Raleigh, NC 27695-7620
Michael G. Burton
Affiliation:
Crop Science Department, North Carolina State University, 4401 Williams Hall, Raleigh, NC 27695-7620
Cavell Brownie
Affiliation:
Department of Statistics, North Carolina State University, 210D Patterson Hall, Raleigh, NC 27695-8203
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Abstract

Knowledge of the influence of environmental factors on weed populations is important in developing sustainable turfgrass management practices. Studies were conducted to evaluate the relationship of green and false-green kyllinga population densities with elevation and edaphic factors in turfgrass systems. Studies were conducted on five different golf courses in North Carolina, three affected by green kyllinga, and two affected by false-green kyllinga. According to Spearman correlation coefficients, both green and false-green kyllinga were correlated with increasing soil volumetric water content, whereas correlation of other edaphic variables varied among sites and species. Stepwise logistic regression confirmed the correlation of volumetric water with green kyllinga presence, but model components varied among sites for false-green kyllinga. Increasing green kyllinga populations correlated with increasing soil sodium; however, sodium did not reach a level believed to be detrimental to turfgrass growth. No other variables correlated with green or false-green kyllinga across all sites. We hypothesized that the lack of significant correlations was due to the overall influence of relative elevation on edaphic variables. According to principal components analysis (PCA), relative elevation had a profound impact on the measured edaphic variables at all sites. However, results of PCA at one site differed sharply from other sites. Results from that site demonstrate the potentially strong effects of management practices to alter edaphic trends normally observed with topography.

Keywords

False-green kyllinga, Kyllinga gracillima L.green kyllinga, Kyllinga brevifolia Rottb.bermudagrass, Cynodon spp.bentgrass, Agrostis sppHabitatmultiple regressionprincipal components analysisturfgrass managementweed ecology
Type
Weed Biology and Ecology
Information
Weed Science , Volume 53 , Issue 5 , October 2005 , pp. 620 - 630
Copyright
Copyright © Weed Science Society of America 

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