EFFECT OF BARBAN AND FLAMPROP METHYL WITH SOLUTION NITROGEN ON WHEAT, WILD OATS AND GREEN FOXTAIL

Abstract

Postemergent sprays of barban (4-chloro-2-butynyl m chlorocarbanilate) at the 2-leaf stage of wild oats (Avena fatua L.) and flamprop methyl [methyl N-benzoyl-N-(3-chloro-4-fluorophenyl)-2-aminopropionate] at the 3-leaf stage in water or solution nitrogen fertilizer gave moderate to good control of wild oats and significant increases of 21 and 30%, respectively, in yields of wheat (Triticum aestivum L. ’Neepawa’). Barban and flamprop methyl had no apparent effect on nitrogen content of wheat grain. When wild oats were controlled with herbicides the decrease in plant competition permitted increased growth of green foxtail (Setaria viridis L. Beauv.). Solution nitrogen and hand-weeding treatments increased nitrogen in the wheat grain significantly. Large increases in numbers and dry matter yields of wild oats resulted in relatively low crop yields from solution nitrogen, e.g. non-significant with barban and a 9% increase in the flamprop methyl experiment. Either herbicide applied with solution nitrogen produced an initial injury to plant leaves. However, wheat recovered rapidly and there was no indication of reduced growth at harvest. No effect was observed when herbicides were applied separately from solution nitrogen.