Written Paper

Microorganisms in soil under the maize crop and their potential for sulfonylurea herbicides degradation. [Doctoral dissertation]  [2010]

Đurić, S. Univerzitet u Novom Sadu, Novi Sad (Serbia). Poljoprivredni fakultet [Corporate Author]

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The objectives of this study were to assess the impact of sulfonylurea-based herbicides and their concentration on the number of soil microorganisms and soil enzyme activity under maize crop under field conditions, to determine their potential of these microorganisms for decompostion of nicosulfuron and foramsulfuron in laboratory conditions, and to isolate and determine strains capable of using herbicides as a source of energy and carbon. The high numbers of the investigated microroganisms in the soil under maize crop indicated that the examined soil is biologically healthy, highly fertile and biogenous, with diverse microbial composition and activity. Based on the calculated least significant differences and interactions of recommended and double doses of the studied herbicide types regarding weed control in maize crop and preservation of soil health, quality and biological value and its microbial diversity and activity, it was recommended to use rimsulfuron, primisulfuron-methyl and prosulfuron instead of nicosulfuron and foramsulfuron. The general conclusion was that the examined groups of microorganisms dissolve more easily nicosulfuron than foramsulfuron. Within the genus Azotobacter spp., 18 strains were isolated which survived a hundredfold concentrations of nicosulfuron than the recommended one.