Abstract
Glyphosate is used extensively worldwide for postemergence control of annual and perennial broadleaf, grass and sedge weeds. Field studies were conducted in 2007 to investigate response of rice plant to sub-lethal rates of glyphosate (isopropyl amine salt) in terms of agronomic characteristics, yield and yield components when applied postemergence at 0, 1.64, 8.20, and 16.4 g ai ha^(-1) to transplanted rice at panicle initiation, boot and heading growth stages. Yields in this study were reduced the greatest when glyphosate was applied at panicle initiation stage. In the first cropping season, yield was reduced 41% when glyphosate was applied at 16.4 g ai ha^(-1) at panicle initiation, 35% when applied at boot stage, and 25% when applied at heading stage. Panicle number and seed number responded to glyphosate applied rates similar to rice yield. Unfilled grain percentage was highest at panicle initiation stage with glyphosate treatment.Grain yield and yield components of rice plant respond to low rates of glyphosate had a similar tendency. However, in this study, glyphosate treatment did not cause any inhibition in plant height, leaf number and tiller number.
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