Published in Scientific Papers. Series A. Agronomy, Vol. LXIV, Issue 1
Written by Tonyo TONEV, Shteliyana KALINOVA, Mariyan YANEV, Anyo MITKOV, Nesho NESHEV
The monitoring shows that in the oilseed rape fields of Bulgaria the dominating weed species are Sinapis arvensis L., Raphanus raphanistrum L., and on separate fields Papaver rhoeas L. The most common cereal weeds are Lolium ssp., Avena fatua L.. and wheat self-seeding. Perennial weeds are relatively limited. Species of the genus Phelipanche are most common in southern Bulgaria. The reasons for the mass distribution of these weed species are the violated crop rotations, seeding of oilseed rapes in short period of time - in 1-2 years on the same field, insufficient quality of the soil tillage, limited choice of herbicides for control of parasitic weeds, etc. The implementation of alternative cropping technologies like Clearfield®, their constant improvement, as herbicide content and selection process showed positive effect for decreasing the density and range of distribution of these weeds in the oilseed rape fields.
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