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Herbicidal Activity of Glyphosate in Soil

Published online by Cambridge University Press:  12 June 2017

Luis C. Salazar  and
Arnold P. Appleby
Luis C. Salazar
Affiliation:
Dep. Crop Sci., Oregon State Univ., Corvallis, OR 97331
Arnold P. Appleby
Affiliation:
Dep. Crop Sci., Oregon State Univ., Corvallis, OR 97331
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Abstract

Greenhouse studies were conducted using bentgrass (Agrostis tenuis Sibth. ‘Highland′) as a bioassay species to measure herbicidal activity of 3.4 kg/ha of the isopropylamine salt of glyphosate [N-(phosphonomethyl)glycine] when applied directly to the soil surface prior to bentgrass emergence. Activity of glyphosate also was examined by applying glyphosate to a moist soil surface and placing alfalfa (Medicago sativa L. ‘Vernal′) and red clover (Trifolium pratense L. ‘Kenstar′) seeds on the sprayed surface 3, 6, 9, and 24 h later. In two high-organic soils, glyphosate reduced bentgrass growth in each of four experiments, even when applied up to 5 days before bentgrass emergence. Significant glyphosate activity was measured in one of the experiments in another organic soil and in three of the experiments in a Chehalis sandy loam soil. Germination and growth of alfalfa and red clover were reduced when seeds were distributed on a sprayed soil surface up to 24 h after glyphosate application. These results show that glyphosate, at least under certain conditions, can cause significant crop injury when used prior to planting or emergence of some species.

Keywords

Agrostis tenuisMedicago sativaTrifolium pratenseparaquatadsorption
Type
Research Article
Information
Weed Science , Volume 30 , Issue 5 , September 1982 , pp. 463 - 466
Copyright
Copyright © 1982 by the Weed Science Society of America 

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References

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