Author:
Tanpipat Songyod,Adkins Steve W.,Swarbrick John T.,Boersma Mark
Abstract
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
µmol/m2· s), 3 temperature regimes
(20/15, 30/25, and 35/30°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°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°C) and less humid (65% relative humidity)
conditions. In all experiments, efficacy was not altered by the level of
irradiance.
Subject
General Agricultural and Biological Sciences
Cited by
34 articles.
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