No evidence for effect of soil compaction on the degradation and impact of isoproturon

Abstract

Soil is damaged by several threats and, among them, chemical contamination by pesticides and compaction. However, the effect of compaction on the fate of pesticides in soil, and the impact of pesticides on soil biological functioning are unknown. Therefore, we studied the effect of soil compaction on the degradation of the herbicide isoproturon, and the impact of this herbicide on an enzyme activity (b-glucosidase) involved in the C soil cycle. Undisturbed soil samples were prepared at different bulk densities, treated with isoproturon then incubated at 18°C in darkness for 63 days. The results showed that soil compaction did not modify significantly the degradation of isoproturon, neither the formation rates nor the nature of its metabolites. Moreover, compaction did not modify the impact of isoproturon on b-glucosidase activity. To our knowledge, these are the first results concerning the interactions between soil compaction and the degradation and impact of a pesticide.

Fate of Pesticides in Soils: Toward an Integrated Approach of Influential Factors

“…The presence of fresh organic matter originating from urban waste compost did not modify the observed results. This was consistent with the results of Mamy et al (2011) who showed that, in the conditions of the experiment, soil compaction did not modify significantly the degradation of isoproturon, neither the formation rates nor the nature of its metabolites. Spatial localization of microorganisms.…”

“…The integrative measurable parameters at this scale are the bulk density and the water content of soil samples. Our recent results confirm that this scale is suited to study the effects of soil structure on the fate of pesticide (Mamy et al, 2011). This scale is also appropriate to measure, in an integrative manner, the fate and ecotoxicological impact of pesticides in conditions close to the field ones.…”

“…From the degradation kinetics, the half-lives (DT50) of pesticides are determined. This method can use either disturbed soil samples (sieved) or undisturbed soil samples such as aggregates or cores (Benoit et al, 2000;Mamy et al, 2011;Monard et al, 2010;Vieublé-Gonod et al, 2009). Field studies.…”

Degradation study of mesotrione and other triketone herbicides on soils and sediments

“…However, the capacity of soil to perform its broad variety of crucial functions might be reduced, mainly due to chemical contamination by pesticides (Mamy et al 2011).…”

Impact of lime and mineral fertilizers on mechanical strength for various soil pHs

“…The critical role of soil structure in soil quality has been recognized for many years because it affects transport phenomena as well as biological activity inherent to soil organic matter dynamic (Six et al, 2004), or to the fate of organic contaminant (Mamy et al, 2011). The structure of soil depends on soil texture and organic matter (Carter, 2004;Dexter, 2004aDexter, , 2004b.…”