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Enzymatic activity in soil contaminated with the Aurora 40 WG herbicide

Baćmaga M., Boros E., Kucharski J., Wyszkowska J.

Environment Protection Engineering

2012

Vol. 38, nr 1

91-102

Aurora 40 WG is a new generation herbicide for controlling dicotyledonous weeds. Its effect on the biochemical properties of soil has not been investigated to date. The aim of this study was to determine the effect of soil contamination with the Aurora 40 WG herbicide on the activity of dehydrogenases, urease, acid phosphatase and alkaline phosphatase. Soil samples with the granulometric composition of loamy sand and sandy clay loam were used in a pot experiment. The lowest herbicide dose was that recommended by the manufacturer, and the successive doses were 2-, 4- and 40-fold higher than the recommended dose. In selected treatments, soil was mixed with finely ground spring barley straw and basalt meal. The experiment was carried out for 50 days, in two series, in unsown soil and in soil sown with spring barley. Soil samples were analyzed on experimental day 25 and 50. The obtained results indicate that the Aurora 40 WG herbicide did not modify the enzymatic activity of soil. The biochemical activity of soil was largely determined by the date of analysis, the addition of barley straw and basalt meal, soil type and soil use. The investigated enzymes were marked by higher activity levels in sandy clay loam than in loamy sand. Barley sowing had a generally positive effect on the enzymatic activity of soil, excluding alkaline phosphatase whose activity was higher in unsown treatments. The addition of finely ground spring barley straw also enhanced the biochemical properties of soil, while no such effects were demonstrated by basalt meal.