EFFECTS OF PERIOD OF WEED INTERFERENCE AND CHEMICAL WEED CONTROL ON RAINFED AND IRRIGATED PEPPERS (Capsicum spp).
EFFECTS OF PERIOD OF WEED INTERFERENCE AND CHEMICAL WEED CONTROL ON RAINFED AND IRRIGATED PEPPERS (Capsicum spp).
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Date
1984-06
Authors
ADIGUN, JOSEPH AREMU
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Abstract
Field trials were conducted to dertermine the effects
of period of weed interference and evaluate various
herbicides for weed control in sweet pepper (Capsicum
annuum L.) and chilli piepper (C. frutescens L.),
respectively at Samaru during the wet season in 1982 and
at Samaru and Kadawa during 1982/83 dry season.
In all the trials, weed infestation for 9 weeks
after transplanting and later significantly depressed
various crop growth parameters such as crop vigour score,
number of leaves and branches per plant and yield and
yield attributes, including fruit number and fresh weight,
compared with the crop kept weed-free throughout its
growth. Although weed association with the crop during
the first 6 WAT depressed crop vigour score, this effect
was not reflected in sweet pepper fruit yield when the
weeds were subsequently removed. In order to obtain
statistically comparable fruit yield to that of the
weed-free control in the wet season at Samaru, it was
necessary to keep the crop weed-free for 6 WAT and later.
In the dry season, however, both at Samaru and Kadawa,
only crops kept weed-free beyond 6 and 9 WAT, respectively
resulted in comparable fruit yield to the weed-free
control. The critical period of weed competition was
observed to be between 6 and 9 WAT.
V
Herbicide treatments which consistently combined
effective weed control with high chilli pepper fruit
yields comparable with the hoe-weeded control, during
the wet and dry seasons include mixtures of alachlor
with linuron and chlorbromuron at 1.0 + 0.5 and 1.0 +
1.0 kg a.i./ha, respectively, mixtures of linuron with
diphenamid and oxadiazon at 0.5 + 6.0 and 0.5 + 2.0,
respectively and pendimethalin plus metobromuron at
2.0 + 1.0 kg a.i./ha. Although high pepper fruit yield
was obtained with both rates of metolachlor plus
metobromuron during the wet season, these treatments did
not consistently result in effective weed control.
In this study unchecked weed growth throughout
the crop life cycle caused between 60 and 92% loss in
potential pepper fruit yield.
Description
A thesis submitted to the Post-graduate School
Ahmadu Bello University in partial fulfilment
of the requirements for the degree of
Master of Science in Agronomy
DEPARTMENT OF AGRONOMY
FACULTY OF AGRICULTURE
AHMADU BELLO UNIVERSITY
ZARIA, NIGERIA
Keywords
EFFECTS,, PERIOD,, WEED INTERFERENCE,, CHEMICAL WEED CONTROL,, RAINFED,, IRRIGATED PEPPERS,, (Capsicum spp),