CONTROL OF CUTGRASS (LEERSIA HEXANDRA SWARTZ PROD) IN DIRECT-SEEDED LOWLAND RICE (ORYZA SATIVA L) IN THE SOUTHERN GUINEA SAVANNA OF NIGERIA
CONTROL OF CUTGRASS (LEERSIA HEXANDRA SWARTZ PROD) IN DIRECT-SEEDED LOWLAND RICE (ORYZA SATIVA L) IN THE SOUTHERN GUINEA SAVANNA OF NIGERIA
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Date
1989-12
Authors
IMEOKPARIA, Peter Ose
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Abstract
The effectiveness of various herbicide treatments
for season-long control of weeds in three cultivars of
rice (Oryza sativa L) was investigated in 1983 wet and
1983-84 dry seasons at Badeggi (09° 45'N and 06° 30'E,,
70.5m above mean sea level) in the Southern Guinea
Savanna ecological zone of Nigeria. During the 1986 wet
and 1985-86 and 1986-87 dry seasons, field trials were
conducted to evaluate herbicide combinations for the
control of cutgrass (Leersia hexandra Swartz Prod) in
direct-seeded lowland rice.
The rice cultivars consisted of FARO 15, FARO 27
and FARO 29 which were tall, short and of medium height,
respectively. The rice cultivars had significant effect
on weed infestation at crop harvest and on qrain yield.
Plots sown with FARO 27 consistently had the highest
infestation of weeds in the two seasons. In 1983 wet
season, FARO 15 and FARO 29 resulted in similar grain
yields that were significantly higher than that of
FARO 27. However, in the 1983-84 dry season, FARO 29
produced higher grain yield than FARO 15 and FARO 27
which were similar in grain yield.
The effect of weed control treatments on weed
infestation, % weed coveraqe was also significant
as reflected in dry weed weight at 30 and 60 days after
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Description
A thesis submitted to the Postgraduate School
Ahmadu Bello University
in partial fulfilment of the requirement for
the Degree of
Doctor of Philosophy in Agronomy
DEPARTMENT OF AGRONOMY
FACULTY OF AGRICULTURE
AHMADU BELLO UNIVERSITY
ZARIA, NIGERIA
Keywords
CONTROL,, CUTGRASS,, (LEERSIA HEXANDRA SWARTZ PROD),, DIRECT-SEEDED LOWLAND RICE,, (ORYZA SATIVA L),, SOUTHERN GUINEA SAVANNA,, NIGERIA