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ARS Home » Research » Publications at this Location » Publication #82907
Title: EFFECT OF SURFACTANTS AND INORGANIC SALTS ON THE EFFICACY OF IMAZETHAPYR APPLIED AT CONVENTIONAL AND ULTRA-LOW SPRAY VOLUMES

Author
item WILLS, GENE - DELTA RESEARCH & EXT. CTR
item Hanks, James
item JONES, ELIZABETH - DELTA RESEARCH & EXT. CTR
item MACK, ROBERT - HELENA CHEMICAL COMPANY

Submitted to: Weed Technology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 3/12/1998
Publication Date: N/A
Citation: N/A

Interpretive Summary: Field experiments were conducted over two consecutive years. Determinations were made on the effect of three types of surfactants and a liquid fertilizer solution on the weed control obtained with the herbicide imazethapyr as applied at the conventional spray volume of 10 gallons per acre and at the ultra-low spray volume of one gallon per acre. Control of pitted morningglory, velvetleaf, and barnyardgrass was increased with the addition of each surfactant and the liquid fertilizer solution. Applications at the ultra-low volume of one gallon per acre were as effective as applications at the conventional ten gallons per acre. Soybeans were not injured by any treatment in this study.

Technical Abstract: Field experiments evaluated pitted morningglory, velvetleaf, and barnyardgrass control in soybeans with imazethapyr applied alone and with either crop oil concentrate at 1.0% v/v, a blend of methylated seed oil and organosilicone surfactant, or a blend of methylated seed oil, phosphate esters, and organosilicone surfactant at 0.5% v/v, each with and without a 28%-N mixture of urea and ammonium nitrate (URAN) applied at 2.3 L/ha. Treatments were applied at spray volumes of 94 and 9.4 L/ha. Control of each species was increased with the addition of both surfactant and URAN. The blend of methylated seed oil, phosphate esters, and organosilicone surfactant and the blend of methylated seed oil and organosilicone surfactant were each more effective than crop oil concentrate on pitted morningglory and barnyardgrass while each surfactant was comparable on velvetleaf. URAN effectively increased control of all species. Control at the spray volume of 9.4 L/ha was comparable to that at 94 L/ha.