[Sorption and microbial degradation of glyphosphate in soil suspensions].

Sorption and microbial destruction of glyphosphate, the active agent of the herbicide Groundbio, in suspensions of sod-podzolic and gray forest soils has been studied. According to the values of the adsorptive capacity (3560 and 8200 mg/kg, respectively) and the Freundlich constants (Kf, 15.6 and 18.7, respectively), these soils had a relatively high sorption capacity as related to the herbicide. Sorbed glyphosphate is represented by extractable and bound (inextractable) fractions. After long-term incubation of sterile suspensions, the ratio of these fractions reached 2 : 1 for sod-podzolic soil and 1 : 1 for gray forest soil. Inoculation of a native suspension of sod-podzolic soil with cells of a selected degrader strain Ochrobactum anthropi GPK 3 resulted in a 25.4% decrease in the total glyphosphate content (dissolved and extractable), whereas in a noninoculated suspension, the loss did not exceed 5.5%. The potential for the use of a selected bacterial strain for intensification of the glyphosphate destruction processes in soil systems is demonstrated for the first time.