Effects of Herbicide Formulation and Application Method on Washoff from Corn Residue

Abstract

ABSTRACT Herbicides were broadcast-sprayed on trays of corn residue that were then subjected to simulated rainfall. Cyanazine washoff was not affected by formulation (liquid, wettable-powder, or dry-flowable) or by method of application (with water or oil-water mixtures). Method of application also did not affect washoff of the liquid formulations of alachlor and propachlor tested. Washoff of cyanazine, alachlor and propachlor with 67.6 mm of rainfall totaled 87, 69 and 88%, respectively, of the herbicides recovered. Most of the washoff occurred with the first 14.5-mm increment of rain.