Chlorsulfuron residues are not accumulating in soils of southern Queensland

Walker, S.R. and Robinson, G.P. (1996) Chlorsulfuron residues are not accumulating in soils of southern Queensland. Australian Journal of Experimental Agriculture, 36 2: 223-228. doi:10.1071/EA9960223


Author Walker, S.R.
Robinson, G.P.
Title Chlorsulfuron residues are not accumulating in soils of southern Queensland
Journal name Australian Journal of Experimental Agriculture   Check publisher's open access policy
ISSN 0816-1089
1446-5574
Publication date 1996
Sub-type Article (original research)
DOI 10.1071/EA9960223
Volume 36
Issue 2
Start page 223
End page 228
Total pages 6
Place of publication Collingwood, VIC, Australia
Publisher C S I R O Publishing
Language eng
Abstract Chlorsulfuron persistence was measured in soils (to a depth of 150 cm) at 4 sites in the winter cereal region of southern Queensland. The residual herbicide had been applied 6-14 times in the previous 7-14 years. Residues were measured using a bioassay based on suppression of root growth of maize (Zea mays cv. GH5010). Less than 3% of the total applied chlorsulfuron (96-210 g a.i./ha) was detected 6-12 months after the last application, and residues were ≤0.7 ng/g soil in the surface 30 cm, and ≤0.3 ng/g below 30 cm. The limited vertical movement of residues was associated with the herbicide being applied in early winter, several months before leaching rains. Changes in residue concentration with time were also measured at a site in central Queensland, and in a fallow management experiment in southern Queensland. Persistence was greater at the cooler, drier site in southern Queensland than in central Queensland; 45-64% compared with 3-4% of applied dose remained 3 months after application respectively. Stubble retention had no effect on persistence, but tillage during the summer fallow increased persistence slightly. There was no evidence of chlorsulfuron residues accumulating and only limited leaching in these alkaline agricultural soils of southern Queensland. Persistence within a season was influenced by soil and climatic factors.
Keyword Acidic sandy soils
Fallowing practices
Metsulfuron-methyl
Persistence
Degradation
Adsorption
Movement
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Queensland Alliance for Agriculture and Food Innovation
 
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