Abstract
Summary. A range of herbicides and combinations of
herbicides were evaluated for controlling nutgrass
(Cyperus rotundus L.) in 5 experiments in irrigated
cotton in northern New South Wales. Control was assessed by comparing the
density of tubers before and after treatment. Cotton lint yield and ginning
percentage were also assessed. Combinations of herbicides, including 2,4-D,
were evaluated in an additional experiment in fallow.
Multiple in-crop applications of glyphosate reduced tuber density by up to
96% over 2 seasons. This was improved with successive applications of
glyphosate. Nutgrass tuber density was also reduced when glyphosate was
combined with norflurazon (96%), benfuresate (92%), fluometuron
(84%) or EPTC (87%). Similar reductions in nutgrass density were
observed with methazole, dimethenamid, atrazine, and the combination of
norflurazon + MSMA. Treatments which reduced nutgrass density generally
resulted in average or above-average lint yields.
From these results, a strategy for controlling nutgrass in cotton can be
developed using norflurazon preplanting, and multiple applications of
glyphosate and/or MSMA in-crop.
Subject
General Agricultural and Biological Sciences
Cited by
4 articles.
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