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Response of Rice (Oryza sativa) to Glyphosate Applied to Simulate Drift

Published online by Cambridge University Press:  20 January 2017

Mark E. Kurtz  and
Joe E. Street
Mark E. Kurtz*
Affiliation:
Delta Research and Extension Center, Mississippi Agricultural and Forestry Experiment Station, Stoneville, MS 38776
Joe E. Street
Affiliation:
Delta Research and Extension Center, Mississippi Agricultural and Forestry Experiment Station, Stoneville, MS 38776
*
Corresponding author's E-mail: [email protected]
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Abstract

Field studies were conducted in 1996, 1998, 1999, and 2000 to determine the effect of glyphosate (isopropyl amine salt) on rice injury and yield when applied postemergence at 0, 70, 140, and 280 g ai/ha to dry-seeded rice in the three- to four-leaf (3- to 4-L), midtiller (MT), panicle initiation (PI), and boot (BT) growth stages. Glyphosate at 140 and 280 g ai/ha applied at the 3- to 4-L, MT, and PI growth stages resulted in the greatest foliar injury, and 280 g ai/ha was more injurious than 140 g ai/ha at the first rating, with the exception of MT and PI 2000, where they were equal. Glyphosate treatments resulted in the least visible foliar injury when applied at the BT stage. Rough rice yield was reduced by glyphosate applied at 280 g/ha to rice in the MT growth stage three out of four years. Applied to rice at PI, glyphosate at 140 g/ha reduced yields two out of four years, and three out of four years when applied at 280 g/ha. BT-stage applications of glyphosate at 70, 140, and 280 g/ha reduced yields two out of four, three out of four, and four out of four years, respectively.

Keywords

Glyphosaterice, Oryza sativa (L.) ‘Cypress’, ‘Lemont’, ‘Priscilla’Rice growth stageBT, bootMT, midtillerPI, panicle initiation3- to 4-L, three- to four-leaf
Type
Research
Information
Weed Technology , Volume 17 , Issue 2 , June 2003 , pp. 234 - 238
Copyright
Copyright © Weed Science Society of America 

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