EFFECTS OF PERIOD OF WEED INTERFERENCE AND CHEMICAL WEED CONTROL ON GROWTH AND YIELD OF GARLIC (Allium sativum L.)
EFFECTS OF PERIOD OF WEED INTERFERENCE AND CHEMICAL WEED CONTROL ON GROWTH AND YIELD OF GARLIC (Allium sativum L.)
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Date
1997-07
Authors
TUNKU, PETER
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Abstract
Two sets of trials were conducted during the 1994 and 1995 dry
seasons at Samaru in the Northern Guinea Savanna agro-ecological
zone of Nigeria to study the effect of period of weed interference
and chemical weed control on the growth and yield of garlic (Allium
sativum L.).
In the weed interference trials, weed infestation initially
for 3 WAP did not cause any significant depression in the growth
and yield of garlic as reflected in crop viguor score, plant height
and number of fully opened leaves per plant and bulb yield.
Subsequent weed removal after initial infestation for 9 WAP did not
ameliorate the depression in the growth and yield of garlic caused
by weed interference compared with weed infestation until harvest.
Uncontrolled weeds throughout the crop life cycle caused 70%
and 80% reduction in garlic yield in 1994 and 1995, respectively,
compared with the maximum obtained with the crop kept weed-free
throughout. The critical period of weed competition was observed
to be between 5 and 6 WAP in both years.
In the weed control study, all the herbicide treatments
effectively reduced weed infestation compared with the hand weeded
control. In the two years, oxadiazon applied alone at lOOOg a.i/ha
and 1500g a.i./ha, the mixture with chloroxuron at 750+1000g
a.i./ha and 750+2000g a.i./ha and with prometryne at 750 +1000g
a.i./ha and 750+l500g a.i./ha resulted in high garlic bulb yield
that were comparable to that of the hoe-weeded control. The
treatment effectively controlled weeds without phytotoxicity on the
crop.
Description
A thesis submitted to the Post-Graduate School,
Ahmadu Bello University, in Partial fulfillment
of the requirement for the degree of master of science in Agronomy.
DEPARTMENT OF AGRONOMY
FACULTY OF AGRICULTURE
AHMADU BELLO UNIVERSITY
ZARIA, NIGERIA.
JULY, 1997
Keywords
EFFECTS,, PERIOD,, WEED,, INTERFERENCE,, CHEMICAL,, WEED,, CONTROL,, GROWTH,, YIELD,, GARLIC,, (Allium sativum L.)