Author: P. Pepó 1
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  • 1 Department of Plant Production and Applied Ecology, Faculty of Agronomy, Centre of Agricultural Sciences, University of Debrecen Debrecen, Hungary
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The effects of herbicides containing different active agents and applied at different times (early, normal and late post-emergence) were studied on a chernozem soil in the Hajdúság region of E. Hungary in stands of different hybrid maize genotypes. The results proved that the extent of weed cover was equally influenced by the forecrop and the year. In a drier year with wheat as the forecrop, moderate weed infestation was recorded, while with maize as the forecrop and more favourable water supplies, infestation was more severe. The hybrid did not have a significant effect on the extent of weed cover. Little (2-6%) or no visible phytotoxicity was observed in the maize hybrids as a consequence of post-emergence herbicide treatments. The yield-enhancing effects of the various herbicides changed in proportion to the weed cover (in comparison to the untreated weedy control). In the case of low weed cover (in 2002 the weedy control was 7.6-8.4%) there were yield increases of 0-500 kg ha-1, which increased to 700-2700 kg ha-1 in the case of moderate weed cover (in 2003 the weedy control was 27.4-35.1%) and to 3200-4200 kg ha-1 when weed infestation was severe (in 2004 the weedy control was 52.3-57.4%). The study proved that maize hybrids with different genotypes demonstrated general and specific types of herbicide sensitivity (active agent, timing of application).

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