Testing of microbial isolate sensitivity in sterile soil after herbicide treatment
2015
Šantrić, Ljiljana (Institute of Pesticides and Environmental Protection, Belgrade (Serbia)) | Radivojević, Ljiljana (Institute of Pesticides and Environmental Protection, Belgrade (Serbia)) | Gajić-Umiljendić, Jelena (Institute of Pesticides and Environmental Protection, Belgrade (Serbia)) | Sarić-Krsmanović, Marija (Institute of Pesticides and Environmental Protection, Belgrade (Serbia)) | Đurović-Pejčev, Rada (Institute of Pesticides and Environmental Protection, Belgrade (Serbia))
Herbicides are commonly used in integrated weed management programs. Their application not only controls weed populations, it also affects microbial populations in soil, such as actinomycetes and azotobacters. This study examined the effects of three herbicides (nicosulfuron, metribuzin and glyphosate) on a tolerant actinomycete isolate (14/3) and a tolerant azotobacter isolate (1/13) in sterile soil. The incorporated herbicide concentrations included the recommended field rates, and 10- and 100-fold higher concentrations. Only 15 ml of sterile distilled water was applied in the control. After incubation for 3, 7, 14 and 30 days in treated soil, the growth and abundance of test isolates were checked. The results show that the tested isolates were highy sensitive to glyphosate. On the other hand, stimulating effects of nicosulfuron and metribuzine on the test isolates indicate their ability to break down the molecules of those two active ingredients and use them as a source of biogenic elements and energy for their various processes.
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