The development of the seed bank of genetically modified and conventional cultivars of oilseed rape and of 13 weeds (some of them potentially cross-compatible with oilseed rape) were investigated. The decrease of the seeds in the seed bank and the rate of emergence in the field were observed over 25 months in relation to soil cultivation. The compared variants were curry-comb, heavy cultivator and plough treatment. Both for oilseed rape and for weeds the treatment with curry-comb showed highest and plough the lowest rate of emergence. No differences could be determined between conventionally and genetically modified cultivars of oilseed rape. After 25 months all cultivars of oilseed rape showed less than 1 % of the initial spread seeds in the seed bank. The weeds showed depending on the species 0 – 12 % of the sowed seeds. An additional investigation on former sites of release, which compared the seed bank of different cultivars of genetically modified, herbicideresistant oilseed rape showed, that adverse weather conditions during harvest time can lead to extensive and persistent seed banks.
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The development of the seed bank of genetically modified and conventional cultivars of oilseed rape and of 13 weeds (some of them potentially cross-compatible with oilseed rape) were investigated. The decrease of the seeds in the seed bank and the rate of emergence in the field were observed over 25 months in relation to soil cultivation. The compared variants were curry-comb, heavy cultivator and plough treatment. Both for oilseed rape and for weeds the treatment with curry-comb showed highest...
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