Gd. Wills et al., EFFECT OF OIL ADJUVANTS AND NITROGEN-FERTILIZER ON THE EFFICACY OF IMAZETHAPYR APPLIED AT CONVENTIONAL AND ULTRALOW SPRAY VOLUMES, Weed technology, 12(3), 1998, pp. 441-445
Field experiments evaluated pitted morningglory, velvetleaf, and barny
ardgrass control in soybean with imazethapyr applied alone and with ei
ther crop oil concentrate at 1.0% v/v, a blend of methylated seed oil
and organosilicone surfactant, or a blend of methylated seed oil, phos
phate esters, and organosilicone surfactant at 0.5% v/v, each with and
without a 28% N mixture of urea and ammonium nitrate (URAN) applied a
t 2.3 L/ha. Treatments were applied at spray volumes of 94 and 9.4 L/h
a. Control of each species was often increased with the addition of bo
th oil adjuvants and URAN, The blend of methylated seed oil, phosphate
esters, and organosilicone surfactant and the blend of methylated see
d oil and organosilicone surfactant were each more effective than crop
oil concentrate on pitted morningglory and barnyardgrass, while each
oil adjuvant was similar on velvetleaf, The URAN effectively increased
imazethapyr control of all species. Control of all species was simila
r at the spray volume of 9.4 L/ha and at 94 L/ha.