Translator Disclaimer
1 March 2017 Dissipation of Clomazone, Imazapyr, and Imazapic Herbicides in Paddy Water under Two Rice Flood Management Regimes
Fabio Schreiber, Ananda Scherner, Joseph H. Massey, Renato Zanella, Luis A. Avila
Author Affiliations +
Abstract

Information on the dissipation of clomazone, imazapyr, and imazapic in paddy water under different irrigation system is not available in the literature. The objective of this study was to investigate the effect of two irrigation systems (intermittent (IF) and continuous (CF) flood) on the dissipation of clomazone, imazapyr, and imazapic in paddy water. Imazapic was the least persistent herbicide in paddy water, with DT50-values of approximately 3 and 5 d under CF and IF, respectively. Imazapyr required a two-fold increase in time to reach its half-life in water in contrast to imazapic, with DT50-values of approximately 6 and 11 d under CF and IF, respectively. Clomazone showed the highest DT50-values, varying between 7 to 21 d under CF and IF, respectively. Imazapyr and imazapic dissipation was faster under CF, while clomazone was not affected. This investigation found that the dissipation behaviors of herbicides vary under different rice irrigation regimes. Thus changes in irrigation management, as will be required to produce more rice grain with less water to avoid future scarcity, should consider impacts of flood management on herbicide persistence and environmental behavior.

Nomenclature: Clomazone; mazapyr; imazapic; rice, Oryza sativa L.

© Weed Science Society of America, 2017
Fabio Schreiber, Ananda Scherner, Joseph H. Massey, Renato Zanella, and Luis A. Avila "Dissipation of Clomazone, Imazapyr, and Imazapic Herbicides in Paddy Water under Two Rice Flood Management Regimes," Weed Technology 31(2), 330-340, (1 March 2017). https://doi.org/10.1017/wet.2017.5
Received: 23 August 2016; Accepted: 1 January 2017; Published: 1 March 2017
JOURNAL ARTICLE
11 PAGES


Share
SHARE
KEYWORDS
contamination
environmental fate
half-life
herbicide
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top