Influence of Formulation and Rate on Rice Tolerance to Early-Season Applications of Acetochlor

Michael Fogleman; Jason K. Norsworthy; Tom Barber

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Influence of Formulation and Rate on Rice Tolerance to Early-Season Applications of Acetochlor

机译：Influence of Formulation and Rate on Rice Tolerance to Early-Season Applications of Acetochlor

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Acetochlor (WSSA Group 15) is a very-long-chain fatty acid–inhibiting herbicide used to control grass weed species in row crops and could potentially be effective when used in a rice herbicide program. A field study was conducted in 2016 and 2017 atfour locations to determine the effects of acetochlor formulation and rate on rice tolerance. Overall, rice was more tolerant to the microencapsulated (ME) formulation of acetochlor than to the emulsifiable concentrate (EC) formulation, likely because ofthe potential for immediate absorption of acetochlor from the EC formulation following rainfall. Differences in rainfall among experimental sites and years caused variation in acetochlor activation and influenced crop injury. In all environments, PRE applications of either formulation resulted in the greatest injury at 2 WAT (61%), while injury following delayed PRE (DPRE) or early POST (EPOST) applications averaged 30% and 16%, respectively. When ME acetochlor was applied EPOST, rough rice yield was 97% of nontreated rice or 9,020 kg ha~(-1), indicating that applications should be delayed until this stage to minimize crop damage and maximize yield.

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《Weed Technology: A journal of the Weed Science Society of America》 |2019年第2期|239-245|共7页
作者
Michael Fogleman; Jason K. Norsworthy; Tom Barber;
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作者单位

Former Graduate Research Assistant, Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR, USA;

Professor and Elms Farming Chair of Weed Science, Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR, USA;

Professor, Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR, USA;

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正文语种英语
中图分类植物保护;
关键词
Eric Webster; Louisiana State University; Acetochlor; rice Oryza sativa L; Herbicide resistance; very-long-chain fatty acid–inhibiting herbicide;

Influence of Formulation and Rate on Rice Tolerance to Early-Season Applications of Acetochlor

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