ISSN 2285-5785, ISSN CD-ROM 2285-5793, ISSN ONLINE 2285-5807, ISSN-L 2285-5785


Published in Scientific Papers. Series A. Agronomy, Vol. LXIII, Issue 1
Written by Tonyo TONEV, Shteliyana KALINOVA, Mariyan YANEV, Anyo MITKOV, Nesho NESHEV

The data analyses from the research showed that in the sunflower fields of Bulgaria a significant dynamics of the weed species and densities that form the weed associations has occurred. In the beginning of the monitoring the dominating weed species were Xanthium strumarium L., Sinapis arvensis L., and on separate fields Cannabis ruderalis Janisch. in high densities was prevailing. The reasons for the mass distribution of these weed species are the violated crop rotations, seeding of sunflowers in short period of time – in 1-2 years on the same field, insufficient quality of the soil tillage, the limited choice of herbicides for their control, etc. The implementation of the alternative cropping technologies like Clearfield® and ExpressSun®, their constant improvement, as herbicide content and selection process showed positive effect for decreasing the density and range of distribution of these three weeds in the sunflower fields. From the other hand led to clearly expressed compensatory processes and mass distribution Chenopodium album L. and Portulaca oleracea L. to a lower extent. It is known that imazamox and tribenuron-methyl have limited efficacy against Chenopodium album and Portulaca oleracea.

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