Abstract:
This study was conducted at Shambat Research Station
farm during the Winter season of 2007 – 2008 to evaluate
efficacy and selectivity of Oxyfluorfen 240% EC ( oxyfen )
on weed control in transplanted onion . Visual observation
showed the treatments at ( 0.10 , 0.15 and 0.20 kg ai / fed )
of Oxyfluorfen 240% EC ( oxyfen ) have no phytotoxicity
on onion .
Treatments of of Oxyfluorfen 240% EC ( oxyfen ) at
( 0.10 , 0.15 and 0.20 kg ai / fed ) rates reduced the weed
( grasses and board leaved ) by more than 90% and onion
yield was increased by 50% .
Oxyfluorfen 240% EC ( oxyfen ) at ( 0.10 , 0.15 and
0.20 kg ai / fed ) significantly decreased the average total
number of weeds compared to control.
The best result was obtained at (0.15 kg ai / fed )
followed by a hand weeding 4 weeks after spraying and it
significantly decreased the average number of weeds
compared to control.
Some weeds were tolerant to the herbicide such as
Cynodon dactylon and Cyperus rotundus .
Oxyfluorfen 240% EC ( oxyfen ) at ( 0.10 , 0.15 and
0.20 kg ai / fed ) gave significantly higher yield compared to
control .
Oxyfluorfen at (0.15 kg ai / fed ) supported by one
hand weeding at 4 weeks after spraying gave significantly
higher yield compared to control but it was not significantly
different from the hand weeded .
The study revealed that Oxyfluorfen 240% EC
( oxyfen ) at ( 0.15 and 0.20 kg ai / fed ) can be
recommended as pre-emergence application for transplanted
onion weed control .
