Laboratory and field experiments were conducted to evaluate the effica
cy of the post-emergence herbicides, fluazifop-P-butyl, glyphosate-iso
propyl-ammonium, paraquat, and glyphosate-trimesium (sulfosate) as inf
luenced by organosilicone-based adjuvants, 'Dyne-Amic' and 'Kinetic'.
Conventional adjuvants 'Agri-Dex' and 'Induce' were included in all ex
periments for comparison. The experimental plots were naturally infest
ed with bahiagrass, camphorweed, common lambsquarters, Florida pusley,
Jerusalem oak, hairy beggarticks, pigweed, and teaweed. Herbicides we
re applied alone or in combination with 'Dyne-Amic', 'Kinetic', 'Agri-
dex', or 'Induce' using a tractor-mounted boom sprayer. 'Dyne-Amic' (2
.5 ml liter-1) was as effective as 'Agri-dex (10 ml liter-1) in increa
sing the efficacy of herbicides on grass and broadleaf weeds studied.
'Kinetic' at 2.5 ml liter-1 was as effective as 'Induce' at 2.5 ml lit
er-1 in increasing the efficacy of herbicides on the weeds studied. Pa
raquat tank-mixtures with the pre-emergence herbicides bromacil and di
uron were more effective when applied at a spray volume of 280 liter h
a-1 than at 140 liter ha-1. Fluazifop-P-butyl and glyphosate-isopropyl
ammonium were more effective at 186 than at 93 liter ha-1. Addition of
'Kinetic' or 'Induce' to the herbicide spray solution had no effect o
n pH, but fluazifop-P-butyl reduced pH to 5.1 or increased it to 7.7 w
hen added to the 93 and 186 liter ha-1 preparations, respectively. Gly
phosate-isopropyl-ammonium reduced pH to 5.0 at the lower, but had lit
tle effect on pH at the higher rate. Reduction in static surface tensi
on and contact angle was greater with organosilicone-based adjuvants t
han with conventional adjuvants.