Hoffmann, Richárd

Kazinczi, Gabriella

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Competitiveness of common ragweed against different plant species

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Julius-Kühn-Archiv 455 | 2016152HALT Ambrosia - final project report and general publication of project findingsHALT Ambrosia - final project report and general publication of project findingsCompetitiveness of common ragweed against different plant species Gabriella Kazinczi, Richárd HoffmannDepartment of Plant Production and Plant Protection, Institute of Plant Science,  Faculty of Agricultural and Environmental Sciences, Kaposvár University, Guba S. str. 40,  H-7400 Kaposvár, Hungary; e-mail: kazinczi.gabriella@ke.huDOI 10.5073/jka.2016.455.31In additive pot experiment the effect of competitor plant species (Festuca rubra, Lolium perenne, Plantago major) was investigated on common ragweed. The densitiy of common ragweed was con-stant, while the density of the other (competitor) plant species was varied.Factors:A: plant species: Festuca rubra cv. Light; Lolium perenne cv. Lipresso; Plantago major.Seeds were provided by JKI. L. perenne and F. rubra from Deutsche Saatveredelung AG, Weissenbur-ger Strasse 5, D-59557 Lippstadt;  P.major from Templiner Kräutergarten, Elsternest 1, 17268 Tem-plin, DeutschlandB: densities/proportions: 100%, 50% and 25% of the three competitor plant species; common rag-weed always 4 single plants in the centre of the pots (Table 1.; Figure 1.)Table 1. Density of competitor plantsPlantago major GA* unk-nownLolium perenne GA 93% Festuca rubra GA 83%seeds/m2 seeds/pot seeds/m2 seeds/pot seeds/m2 seeds/pot100% 2500 100 1970 80 2340 9650% 1250 50 921 40 1170 4825% 625 25 460 20 585 24*GA: germination abilityVariants: 10Replicates: 4Pot size: 20 x 20 x 6 cmAssessment: fresh and dry shoot weight of Ambrosia and other competitior plants/potFigure 1. Competiton between common ragweed and Lolium perenne in additive pot experiments. The densitiy of common ragweed is constant, while the density of the other plant species is varied.Julius-Kühn-Archiv 455 | 2016HALT Ambrosia - final project report and general publication of project findings153HALT Ambrosia - final project report and general publication of project findingsBiomass production (fresh and dry shoot weight) of ragweed increased as the other plant’s (P. ma-jor, F. rubra, L. perenne) density decreased. Biomass production of the other (competitor) plant’s increased with the increased plant density but at higher densities the effect of intraspecific com-petition between individuals could be observed. L. perenne had the strongest competitive ability followed by P. major and F. rubra (Table 2, Figure 2). Table 2. The change of fresh and dry shoot weight of common ragweed and competitor plants for a pot due to the different plant density (fresh shoot weight/dry shoot weight)Densities of com-petitor plantsA. artemisiifolia+P.major A . artemisiifolia+L. perenneA. artemisiifolia+F.rubraA. artemisii-foliaP.major A. artemisii-foliaL. perenne A. artemisii-foliaF. rubra100% 11.3c/3.4d 17a/5a 6.7c/2.6d 16.45a/4.6a 27.65c/7.9c 5.9a/0.93a50% 20.8b/6.5c 10b/2.5b 18.5b/5.4c 12.7a/3.9a 61.9b/16.6ab 5.1a/0.8a25% 24b/8.4b 7.75b/0.75c 38a/7.9b 4b/1.4b 69b/18.3b 2.4b/0.39b0% 44.6a/14.6a - 44.6a/14.6a - 44.6a/14.6a -LSD5%5.66/1.58 3.37/1.37 7.44/0.71 4.19/0.91 7.65/2.43 1.85/0.24PLFothersragweed02468101214av.shoot dry weight (g/pot)P:PLAMA; L:LOLPE, F:FESRUFigure 2. The average shoot dry weight/pot of A.artemisiifolia and competitor plants

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Competitiveness of common ragweed against different plant species

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