Abstract
Field experiments were conducted to evaluate the efficacy of glyphosate
(H1) and fluazifop-
-P-butyl (H2) herbicides with adjuvants on the common reed without cutting and
at two
different cutting levels (10 and 30 cm). The adjuvants were urea, nitric acid
and sulfonic
acid. The relative importance value (RIV), leaf chlorophyll content and plant
density were
determined to assay the efficacy of herbicides. Glyphosate treatment only
(H1a) was more
effective than fluazifop-P-butyl (H2a) on reeds without cutting and at the 10
cm cutting
level. However, no significant difference was observed between them at the 30
cm cutting
level. A positive effect of plant cutting occurred on the efficacy of all
herbicides applied
alone or in a tank mix with adjuvants. Furthermore, the 10 cm cutting level
was more effective
in eradication of reeds than the 30 cm cutting level. The adjuvants
significantly improved
the efficacy of the recommended (Hb) and half recommended (Hc) herbicide rates
in comparison to being used alone on uncut reeds. The reduction percentages
were 94.5,
86.99, 76.61 and 69.94 for H1b, H1c, H2b and H2c treatments, respectively.
However, the
adjuvants did not improve the glyphosate effect at different levels of
cutting. Conversely the
reduction percentage of reeds was improved by the recommended rate of
fluazifop-P-butyl
with adjuvants (H2b) to 92.77% and 84.62% at 10 and 30 cm cutting levels,
respectively.
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