SOIL PERSISTENCE OF THIAMETURON (DPX M6316) AND PHYTOTOXICITY OF THE MAJOR DEGRADATION PRODUCT
- 1 August 1990
- journal article
- research article
- Published by Canadian Science Publishing in Canadian Journal of Soil Science
- Vol. 70 (3) , 485-491
- https://doi.org/10.4141/cjss90-047
Abstract
The persistence of the herbicidal ester (14C)thiameturon was studied at different temperature and moisture conditions in three Saskatchewan soils. In all soils at 20 °C and 85% field capacity, the (14C)ester underwent rapid hydrolysis to (14C)thiameturon acid. The hydrolysis was over 85% complete in 1 week, and more than 95% complete after 2 wk. The soil degradation of (14C)thiameturon acid was considerably slower than that of the parent ester. Transformation of (14C)thiameturon to acid in all soils at 85% field capacity was temperature dependent, being slowest at 10 °C, and fastest at 30 °C. Conversion to the acid was also moisture dependent. There was no hydrolysis in air-dry soils after 10 wk. At 50% field capacity 22% of the ester remained after 1 wk, and at field capacity less than 2% of the applied ester was recoverable after 1 wk. Soils treated with thiameturon acid at rates up to 500 μg g−1 exhibited no phytotoxicity to canola, lentil, or sugarbeet seedlings. Key words: Herbicide, thiameturon, persistence, phytotoxicityThis publication has 1 reference indexed in Scilit:
- Transformation of the herbicide [14C]glufosinate in soilsJournal of Agricultural and Food Chemistry, 1989