Abstract:
This study was conducted at Shambat Research Station farm
(ARC), during the winter season of 2004-2005, to evaluate the efficacy of
weed control using two pre-emergence herbicides.
Goal herbicide (Oxyflurofen) applied at three doses (0.0625kg.a.i/fed),
(0.050kga.i/fed), (0.03750kg,a.i/fed) and Stomp (Pendimethalin) (0.4687
kg.a.i./fed) (0.3750kg.a.i/fed) (0.2812kg.a.i/fed) to see the tolerance of
the onion crop (Allium cepa L) to these herbicide treatments.
Results have shown that the herbicide Goal at its high dose
(0.0625kg a.i/fed) gave a significant increase in plant height, compared to
the unweeded control. At dose (0.4687 Kga.i./fed) of good significant
increase was achieved in length of leaves compared to the control. The
two herbicides, Stomp at rate (0.4687 kg.a.i/fed) and Goal at rate
(0.0625kg a. I/fed) gave excellent and persistent control of annual
grasses. However, they gave moderate control on annual broad – leaved
weeds. In comparing, the two herbicides from results it is evident that the
best weed control was achieved with Stomp herbicide at rate (0.4687 kg
a.i./fed). Some of the weed species in the experimental site such as
Datura stramonium L. (Sakaran) Datura innoxia Mill. Xanthium
brasillicum Waller, Merremia emarginata (Brun), and Ipomea
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cordofana, have shown some tolerance as manifested by their appearance
in the herbicide treated plots.
The effect of Stomp herbicide at rates ( (0.2812),(0.375),
(0.4687)kg a.i./fed) on yield of onion seedlings significantly increased the
yield over the control and gave comparable yields to weeded control.
Goal at rates
((0.0375),(0.050),(0.0625) kg.a.i/fed)) significantly
increased the onion seedlings yield ,but at highest rate ( 0.0625 kg
.a.i./fed ) the yield obtained was not significant over the control and gave
yield lower the weeded plots.
