DBPapers
DOI: 10.5593/SGEM2014/B32/S13.015

ENZYME ACTIVITIES AS A COMPONENT OF NUTRIENT CYCLING PROCESSES IN SOIL AMENDED WITH PESTICIDES

S. Kovacsova, S. Javorekova, J. Medo, J.Makova, I. Charousova
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-14-8 / ISSN 1314-2704, June 19-25, 2014, Book 3, Vol. 2, 107-114 pp

ABSTRACT
The aim of our study was to describe the effect of two different insecticides with active substances chlorpyrifos and bifenthrin (Dursban, Talstar) and two herbicides with active substances linuron and dimetachlor (Linurex, Teridox) on the soil enzyme activities tested in laboratory conditions. The pesticides were applied to the arable soil in recommended doses of manufacturer and in dose one hundred times higher than recommended amount. Dehydrogenase activity and FDA hydrolase activity were detected on the day of the establishment of the experiment and on the 1st, 3rd, 7th, 14th, 28th, 56th and 112th day of incubation. Decrease of dehydrogenase activity occurred after application of all pesticides except bifenthrin from the beginning of the experiment to the 112th day, even when recommended doses of pesticides were used, but most significant changes were observed in higher doses. The activity of FDA hydrolase was negatively affected only by insecticide chlorpyrifos. In both doses used in our experiment, herbicides did not have remarkable changes to FDA hydrolase activity. According to results of regression analysis, dehydrogenase activity positively correlated with FDA hydrolase activity (r=0.55) in all treatments and negatively correlated with Cmic (r=0.50) only in treatments with herbicides. Negative correlations were found between FDA hydrolase activity and Cox (r=0.59) and Cmic (r=0.57) in soil amended with herbicides.

Keywords: insecticides, herbicides, dehydrogenase activity, fluorescein diacetate hydrolase activity, arable soil

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