Increasing use of herbicide alternatives to the well-studied photosystem II (PSII) inhibiting products in cropping areas across Queensland, Australia, means less data is available to predict the fate of commonly applied herbicides in this tropical environment. Dissipation of fourteen commonly applied herbicides, including the traditionally applied PSII inhibiting products, was measured under controlled glasshouse conditions on crop residue and on nine soils. For comparison, in-situ field measurements of dissipation were collected for selected herbicides at three sites. Calculated half-lives from this study were comparable to literature values from tropical field situations for well-studied herbicides including atrazine and ametryn. Half-lives of herbicides that have not previously been reported under tropical conditions (imazapic, pendimethalin, trifloxysulfuron) were 2.5-6 fold shorter than indicated in an international database. Prediction of off-site losses of herbicides from a farm was compared using half-lives from this study and those available from a database following adjustment for local temperatures.

Herbicide degradation on soils and crop residue from tropical farming systems under controlled and field conditions

248th National Meeting (2014)

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