
%0 Journal Article
%A Tanpipat, Songyod 
%A Adkins, Steve W. 
%A Swarbrick, John T. 
%A Boersma, Mark 
%T Influence of selected environmental factors on glyphosate efficacy when applied to awnless barnyard grass (<emph type="2">Echinochloa colona</emph> (L.) Link)
%J Australian Journal of Agricultural Research
%D 1997/06/04
%V 48
%N 5
%P 695-702
%K herbicide, water stress.
%R https://doi.org/10.1071/A96141
%U https://www.publish.csiro.au/paper/A96141 
%X Glasshouse experiments were conducted to determine the effects of various environmental factors on glyphosate efficacy when applied to Echinochloa colona (L.) Link (awnless barnyard grass) plants. The variables examined were 4 soil moisture conditions (29, 42, 55, and 100% of field capacity), 2 levels of irradiance (400 and 800 &#181;mol/m2&#183; s), 3 temperature regimes (20/15, 30/25, and 35/30&#176;C; day/night), and 2 levels of relative humidity (92 and 65%). The efficacy of 360 g acid equivalent glyphosate/ha was greatest when applied to well-watered (field capacity) plants that were placed under cool (20/25&#176;C) and humid (92% relative humidity) conditions. The efficacy was least when applied to plants under severe water stress (29% of field capacity) that were placed under hot (35/30&#176;C) and less humid (65% relative humidity) conditions. In all experiments, efficacy was not altered by the level of irradiance. 
