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Influence of environmental factors on glyphosate efficacy when applied to Avena fatua or Urochloa panicoides

journal contribution
posted on 2023-05-18, 11:57 authored by Adkins, SW, Tanpipat, S, Swarbrick, JT, Boersma, M
Glasshouse experiments were conducted to determine the effects of soil moisture content, irradiance, temperature and relative humidity on the efficacy of glyphosate applied to six isogenic lines of Avena fatua L. (wild oat) and four near-isogenic lines of Urochloa panicoides Beauv. (liverseed grass). The variables examined were four soil moisture conditions (29%, 42%, 55% and 100% of field capacity), two levels of irradiance (400 and 800 μmol m−2 s−1), two levels of relative humidity (>92% and 65%) and four temperature regimes (20/15, 25/20, 30/25 and 35/30 °C: day/night), representing the environmental conditions of winter or summer fallows in the north-east grain region of Australia. The efficacy of 360 g acid equivalent ha−1 glyphosate was greatest under well-watered (100% of field capacity), warm (30/25 °C for A. fatua and 35/30 °C for U. panicoides) and humid (>92/90%) conditions. The efficacy was least under severe water stress (29% of field capacity), warm (30/25 °C for A. fatua and 35/30 °C for U. panicoides) and moderately humid (65/60%) conditions. Efficacy was not altered by the level of irradiance nor was it different between isogenic lines.

History

Publication title

Weed Research

Volume

38

Pagination

129-138

ISSN

0043-1737

Department/School

Tasmanian Institute of Agriculture (TIA)

Publisher

Blackwell Publishing Ltd

Place of publication

9600 Garsington Rd, Oxford, England, Oxon, Ox4 2Dg

Rights statement

© 1998 European Weed Research Society

Repository Status

  • Restricted

Socio-economic Objectives

Wheat

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