Abstract:
Field experiments were conducted at the Experimental Farm, Department of Agronomy,
Annamalai University, Annamalai nagar to study the evaluation of Pendimethalin 38.7% CS and
various cotton herbicides in cotton during August 2018 to January 2019 and August 2019 to
January 2020 with cv. MCU 7. The experiment consists of eight treatment viz., Pendimethalin
38.7 % CS @ 438.75 g a.i/ha, Pendimethalin 38.7 % CS @ 580.50 g a.i/ha, Pendimethalin 38.7
% CS @ 677.25 g a.i/ha, Fluchloralin 45% EC @ 1125 g a.i/ha, Pendimethalin 30 % EC @ 750
g a.i/ha, Trifluralin 48% EC @ 960 g a.i/ha, Fluchloralin 45% EC @ 2000 g a.i/ha and unweeded
check. Regardless of season, all the treatments were found to significantly influenced the weed
biometrics, growth, yield components and yield of cotton. Among the treatments tested,
Pendimethalin 38.7 % CS @ 677.25 g a.i/ha recorded least weed counts, weed dry matter
production, highest weed control index and weed control efficiency favouring higher growth,
yield attributes and seed cotton yield in first and second seasons, respectively. This was followed
by Pendimethalin 38.7 % CS @ 580.50 g a.i/ha. These treatments were significantly superior
than the rest in reducing the weed infestation and ultimately increasing seed cotton yield in both
seasons. Unweeded check recorded the highest weed counts, weed biomass resulting in the least
growth and seed cotton yield in first and second seasons, respectively. From the study, it may be
concluded that application of Pendimethalin 38.7 % CS @ 677.25 g a.i/ha is considered to be
judicious recommendation to cotton farmers in view of inadequate labour and higher manual
weeding cost.
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