Agronomic and environmental implications of enhanced s-triazine degradation

Pest Management Science
By: , and 

Links

Abstract

Novel catabolic pathways enabling rapid detoxification of s-triazine herbicides have been elucidated and detected at a growing number of locations. The genes responsible for s-triazine mineralization, i.e. atzABCDEF and trzNDF, occur in at least four bacterial phyla and are implicated in the development of enhanced degradation in agricultural soils from all continents except Antarctica. Enhanced degradation occurs in at least nine crops and six crop rotation systems that rely on s-triazine herbicides for weed control, and, with the exception of acidic soil conditions and s-triazine application frequency, adaptation of the microbial population is independent of soil physiochemical properties and cultural management practices. From an agronomic perspective, residual weed control could be reduced tenfold in s-triazine-adapted relative to non-adapted soils. From an environmental standpoint, the off-site loss of total s-triazine residues could be overestimated 13-fold in adapted soils if altered persistence estimates and metabolic pathways are not reflected in fate and transport models. Empirical models requiring soil pH and s-triazine use history as input parameters predict atrazine persistence more accurately than historical estimates, thereby allowing practitioners to adjust weed control strategies and model input values when warranted. 

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Agronomic and environmental implications of enhanced s-triazine degradation
Series title Pest Management Science
DOI 10.1002/ps.1909
Volume 66
Issue 5
Year Published 2010
Language English
Publisher Society of Chemical Industry
Publisher location West Sussex, UK
Contributing office(s) National Research Program - Central Branch
Description 21 p.
First page 461
Last page 481
Online Only (Y/N) N
Additional Online Files (Y/N) N