Study of oriental tobacco weed infestation in the region of Svilengrad and the influence of some herbicides on soil micriflora

Shteliana Kalinova, N. Tahsin, Tsveta Hristeva

Abstract: During the period 2009 – 2011 was study the weed infestation of oriental tobacco in three villages of the municipality Svilengrad, Bulgaria. And also are conducted some microbiological analyzes to identity the influence of herbicides pendimethalin (Stomp 330 EC – 400 ml/da) and s-metolachlor (Dual Gold 960 EC – 150 ml/da) on Azotobacter chroococum. Were reported 20 weed species from six biological groups. Dominated late spring weeds – total 10 species. There are root parasites – Orobanche ramosa L. and Orobanche mutelli L. and the stem parasite – Cuscuta epithymujm (L.) L. The subjects to survey pendimethalin and s-metolachlor do not a negative effect on the development of Azotobacter chroococum.

Keywords: Azotobacter chroococum; pendimethalin; s-metolachlor; tobacco; weeds

Date published: 2017-07-12