Full TGIF Record # 226470
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Web URL(s):http://www.swss.ws/wp-content/uploads/docs/2010 Proceedings-SWSS.pdf#page=104
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Author(s):Doroh, M. C.; McElroy, J. S.; Walker, R. H.; Guertal, E. A.
Author Affiliation:Auburn University, Auburn, AL
Title:Competitive effects of crabgrass and goosegrass on 'Zenith' zoysiagrass (Zoysia japonica) establishment
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Meeting Info.:Little Rock, Arkansas: January 25-27, 2010
Source:2010 Proceedings, Southern Weed Science Society. Vol. 63, 2010, p. 54.
# of Pages:1
Publishing Information:Champaign, Illinois: Southern Weed Science Society
Keywords:TIC Keywords: Cultivar evaluation; Developmental stages; Digitaria ischaemum; Dry weight; Eleusine indica; Establishment; Weed competition; Weed density; Zoysia japonica
Cultivar Names:Zenith
Abstract/Contents:"Establishment of zoysiagrass by seed is advantageous due to lower costs compared to vegetative establishment. Weed competition often slows seeded turfgrass establishment. The result of turfgrass-weed competition may be affected by management practices, weed density, and weed species present. In crop production systems, indices have been developed that rate the competitiveness (the ability to reduce crop yield) of weed species. In turfgrass systems, such indices have not been developed. Little is known about how turfgrasses compete with weed species during early developmental stages. Therefore, the objective of this research was to determine the competitive effects of smooth crabgrass [Digitaria ischaemum (Schreb. Ex Schweig.) Schreb ex Muhl.] and goosegrass [Eleusine indica (L.) Gaertn.] on the seeded establishment of 'Zenith' zoysiagrass (Zoysia japonica Steud.). Competition studies were conducted in Winter 2008 at the Auburn University Weed Science greenhouse in Auburn, AL. The experiment was an additive design with three replications. Experimental units were 0.13 m2 greenhouse flats. Zoysiagrass seeding rate was constant at 49 kg ha-1 pure live seed (PLS) while weeds (neighbor species) per unit area increased. Neighbor seeding rate was based on seed weight and germination percentage. Smooth crabgrass seed was obtained from Estel Farm and Seeds while goosegrass seed was collected from local populations. A sandy-loam soil with pH 6.1 was steam sterilized and subsequently mixed with Pro-mix (Pro-Mix TA, Premier Horticulture Inc., Quakertown, PA 18951) at 5:1 (soil:Pro-mix) to restore soil structure and water holding capacity. Treatments included: zoysiagrass-alon (monoculture); zoysiagrass plus 61, 185, 395, 674, or 898 neighbor plants (PLS) per experimental unit. These densities represent plant counts from preliminary studies using neighbor seeding rates of 4.9 to 49 kg ha-1. Data collected from each experiment included: (i) Plant counts and developmental stage measurements at 2, 4, 6, and 8 weeks after seeding (WAS) from two 104 cm2 samples per flat, and (ii) plant counts and dry weights of above-ground tissue harvested 8 WAS. Three categories of zoysiagrass developmental stage were organized: 'Leaf' stage represented by one to three leaf plants; 'Tiller 1' represented by one to four tiller plants; and 'Tiller 2' represented by five to eight tiller plants. Zoysiagrass dry weights were expressed as percent drymatter yield of the monoculture. Plant count and developmental stage data were analyzed using SAS® PROC MIXED (SAS Statistical Software. v. 9.1 Cary, NC). Zoysiagrass development was reduced at all seeding densities by both weed species. No reduction in zoysiagrass development was observed from smooth crabgrass or goosegrass 4 WAS; however, reduction in zoysiagrass developmental stage (Tiller 1 and 2) was observed 8 WAS with increasing neighbor density. Therefore, data discussed hereafter applies to the 8 WAS rating date. Smooth crabgrass and goosegrass reduced Tiller 2 development to <20% at density of 185 neighbor plants. Tiller 1 development however, was not reduced by either species at this neighbor density. At the highest neighbor density, 898 neighbor plants, goosegrass eliminated zoysiagrass tillering entirely, whereas smooth crabgrass allowed >25% zoysiagrass plants to tiller. Neighbor species was significant for plant count and drymatter yield data. Additionally, density of weed species was significant for drymatter yield. Overall, percent zoysiagrass drymatter yield was reduced from 30 to 90% with increasing neighbor density. Goosegrass reduced drymatter yield 80% compared to a reduction of 52% from smooth crabgrass at neighbor density of 185 plants. Both weed species reduced drymatter yield >85% at the highest neighbor density of 898 plants. In agreement with developmental stage data, goosegrass reduced zoysiagrass drymatter yield greater than crabgrass at equivalent seeding density."
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ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Doroh, M. C., J. S. McElroy, R. H. Walker, and E. A. Guertal. 2010. Competitive effects of crabgrass and goosegrass on 'Zenith' zoysiagrass (Zoysia japonica) establishment. South. Weed Sci. Soc. Proc. 63:p. 54.
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http://www.swss.ws/wp-content/uploads/docs/2010 Proceedings-SWSS.pdf#page=104
    Last checked: 08/01/2013
    Requires: PDF Reader
    Notes: Item is within a single large file
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