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- Title
Factors affecting glyphosate activity in Imperata cylindrica (L.) Beauv. and Cyperus rotundus L. II: effect of shade.
- Authors
Moosavi-Nia, H.; Dore, J.
- Abstract
<em>Imperata cylindrica</em> and <em>Cyperus rotundus</em> were grown under three different light regimes; unshaded, 50% shade, and 75% shade and no shade plus 75% shade before and after spraying, (temporary shade) in a heated greenhouse. Six weeks after the start of the experiments, glyphosate was applied to the plants at 0.2, 0.4 and 0.8 kg/ha (for <em>Imperata</em>) or 0.3, 0.6 and 1.2 kg/ha (for <em>Cyperus</em>). Glyphosate toxicity was enhanced as shade increased. In <em>Imperata</em>, all shade regimes at all rates of glyphosate caused greater damage to the plants than the unshaded regime. The reduction in shoot dry weight, rhizome dry weight and total carbohydrate content of <em>Imperate</em> rhizomes at 75% continuous and temporary shade conditions, with the lowest rate of glyphosate, was almost twice as much as the reduction in the same features in the unshaded plants caused by the highest rate of glyphosate. In <em>Cyperus</em>, glyphosate at the intermediate and highest rates decreased the shoot dry weight at 75% continuous shade by 79% and 98%, respectively. Plants in 50% shade were significantly affected only at the highest rate of glyphosate. Sprouting ability of the tubers at 75% continuous shade was inhibited when the tubers were replanted for recovery. Enhanced toxicity of glyphosate in reduced light intensity was attributed to the morphological changes in the nature of the leaves caused by shade.
- Subjects
IMPERATA; COGON grass; NUTGRASS; CYPERUS; GLYPHOSATE; LEAVES
- Publication
Weed Research, 1979, Vol 19, Issue 5, p321
- ISSN
0043-1737
- Publication type
Article
- DOI
10.1111/j.1365-3180.1979.tb01545.x