Abstract
Anaerobic digestion in biogas reactors generates a semi-solid leftover, the digestate, which is frequently used as a crop fertiliser. If weed seeds in the maize biomass that is used for feedstock survive the process of anaerobic digestion, the use of digestate could contribute to the spread of weeds. We investigated here the probability that weeds enter the biogas production chain via maize biomass. Five organic and four conventional maize fields were sampled to determine the identity, density and biomass of the weeds present, and the number and viability of seeds produced. This was done separately for plant parts below and above the anticipated cutting height of the maize crop, close to the anticipated harvest date. Weed density varied from 56 to 568 weeds m−2 and weed seed production from 886 to 229 256 seeds m−2. Conventional fields tended to have lower weed biomass, lower seed production, and lower proportion of the seeds above the cutting height of maize, with lower seed viability. The main weeds were Chenopodium album and Echinochloa crus-galli. In general, either weed plants were small and produced few seeds that were largely found below the cutting height of maize, or they were tall and produced numerous seeds that were largely found well above the cutting height. Given the numbers of weed seeds produced per hectare in this study, it is likely that some will survive anaerobic digestion in biogas plants, although in low numbers, as seed survival during anaerobic digestion tends to be low.
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References
Arthurson V, 2009. Closing the global energy and nutrient cycles through application of biogas residue to agricultural land — potential benefits and drawbacks. Energies 2, 226–242.
Colleran E, 2000. Hygienic and sanitation requirements in biogas plants treating animal manures or mixtures of manures and other organic wastes. http://www.ava1.de/botulinum/DS4_Colleran-1.pdf. (last accessed 1 Novem-ber 2011).
Harker KN, Kirkland KJ, Baron VS & Clayton GW, 2003. Early-harvest barley (Hordeum vulgare) silage reduces wild oat (Avenafatua) densities under zero tillage. Weed Technol 17, 102–110.
Henneberg M, 2010. Meteorologische Daten aus Rostock, Satower Str. 48 für das Jahr 2010. http://www2.auf.unirostock.de/ll/Schwerpunkte/Wetterstation/wetterstation.html?#2010. (last accessed 11 January 2012).
Jeyanayagam SS & Collins ER, 1984. Weed seed survival in a dairy manure anaerobic digester. T ASAE 27, 1518–1523.
Katovich EJS, Becker RL & Doll J, 2004. Weed seed survival in anaerobic digesters. The Minnesota Project. http://www.mnproject.org/pdf/Weed%20Seed%20long%20-% 20web%20cx.pdf. (last accessed 1 November 2011).
Leonhardt C, Weinhappel M, Gansberger M, Brandstetter A, Schally H & Pfundtner E, 2010. Untersuchungen zur Verbreitungsgefahr von samenübertragbaren Krankheiten, Unkräutern und austriebsfähigen Pflanzenteilen mit Fermentationsendprodukten aus Biogasanlagen. Endbericht zum Forschungsprojekt 100296/2. http://www.ages.at/uploads/media/100296_Endbericht_biogas_dafne_letztfassung.pdf (last accessed 1 November 2011) (in German).
Mertens SK, 1998. Weed communities on six ecological farms in Flevoland. MSc Thesis Wageningen Agricultural University. 76 pp.
Mehrtens J, Schulte M & Hurle K, 2005. Unkrautflora in Mais, Ergebnisse eines Monitorings in Deutschland. Ges Pflanzen 57, 206–218 [in German].
Moore RP, 1985. Handbook on tertrazolium testing. The international seed testing association, Zürich, Switzerland.
Neylon JM & Kung Jr L, 2003. Effects of cutting height and maturity on the nutritive value of corn silage for lactating cows. J Dairy Sci 86, 2163–2169.
Sarapatka B, Holub M & Lhotska M, 1993. The effect of farmyard manure anaerobic treatment on weed seed viability. Biological Agric Hortic 10, 1–8.
Schrade S, Oechsner H, Pekrun C & Claupein W, 2003. Einfluss des Biogasprozesses auf die Keimfähigkeit von Samen. Landtechnik 58, 90–91 (in German).
Westerik M & Kleizen R, 2006. Onderzoek sanitatie tijdens anaërobe vergisting ter bestrijding van onkruidzaden en ziektekiemen. HoSt Bio-energy installations BV, Hengelo, Netherlands http://www.vergisting.nl/wp/wp-content/uploads/2007/11/1492rap01-rev-02–22–10–07.pdf (last accessed 1 November 2011) (in Dutch).
Westerman PR, Hildebrandt, F & Gerowitt B, accepted. Weed seed survival following ensiling and mesophilic anaerobic digestion in batch reactors. Weed Res.
Wu Z & Roth G, 2004. Considerations in managing cutting height of corn silage. Extension bulletin DAS 03–072. http://www.das.psu.edu/research-extension/dairy/nutrition/pdf/cscutheight.pdf (last accessed 1 November 2011).
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Westerman, P.R., Gerowitt, B. The probability of maize biomass contamination with weed seeds. J Plant Dis Prot 119, 68–73 (2012). https://doi.org/10.1007/BF03356422
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DOI: https://doi.org/10.1007/BF03356422