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Am. J. Alternative Agr. 1992 7 169 180 Christensen, J. (1995): Weed suppression ability of

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We studied the early vegetation dynamics in former croplands (sunflower and cereal fields) sown with a low-diversity seed mixture (composed of 2 native grass species) in Egyek-Pusztakócs, Hortobágy National Park, East-Hungary. The percentage cover of vascular plants was recorded in 4 permanent plots per field on 7 restored fields between 2006 and 2009. Ten aboveground biomass samples per field were also collected in June in each year. We addressed two questions: (i) How do seed sowing and annual mowing affect the species richness, biomass and cover of weeds? (ii) How fast does the cover of sown grasses develop after seed sowing? Weedy species were characteristic in the first year after sowing. In the second and third year their cover and species richness decreased. From the second year onwards the cover of perennial grasses increased. Spontaneously immigrating species characteristic to the reference grasslands were also detected with low cover scores. Short-lived weeds were suppressed as their cover and biomass significantly decreased during the study. The amount of litter and sown grass biomass increased progressively. However, perennial weed cover, especially the cover of Cirsium arvense increased substantially. Our results suggest that grassland vegetation can be recovered by sowing low diversity mixtures followed up by yearly mowing. Suppression of perennial weed cover needs more frequent mowing (multiple times a year) or grazing.

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36 505 513 Seavers, G. P., Wright, K. J. (1999): Crop canopy development and structure influence weed suppression. Weed Research Oxford , 39 , 319

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. 1993. Interaction of light, soil moisture, and temperature with weed suppression by hairy vetch residue. Weed Sciemce 41, 46–51. Teasdale J.R. Interaction of light, soil moisture

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COMBS (Collaborative Group on Maize-Based Systems Research) (1993): Improvement in Soil Fertility and Weed Suppression Through Legume-based Technologies . IITA Research Guide 48. Training Programme, IITA, Ibadan, Nigeria. 42 p

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, J. P. , Mazzola , M. ( 2008 ) Role of native soil biology in Brassicaseous seed meal-induced weed suppression, Soil Biol . Biochem. 40 , 1689 – 1697 . 19. Hu , G

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Acta Botanica Hungarica
Authors: P. Török, T. Miglécz, O. Valkó, K. Tóth, A. Kelemen, Á.-J. Albert, G. Matus, A. Molnár V, E. Ruprecht, L. Papp, B. Deák, O. Horváth, A. Takács, B. Hüse, and B. Tóthmérész

. and Tóthmérész, B. (2012): Recovery of native grass biodiversity by sowing on former croplands: is weed suppression a feasible goal for grassland restoration? - J. Nat. Conserv. 20 : 41–48. Tóthmérész B

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Földműveléstan 1993 Petersen, J. et al., 2001. Weed suppression by release of isothiocyanates from turniprape mulch

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