The 2012 RUFORUM Biennial Conference is the third in the series. The main objective of the Biennial conferences is to provide a platform for agricultural research for development stakeholders in Africa and beyond to actively exchange findings and experiences, while at the same time learning lessons towards improving performance of the agricultural sector and ultimately people’s livelihoods. The biennial conference is RUFORUM’s most comprehensive meeting for the diversity of stakeholers in agriculture. It is especially dedicated to graduate students and their supervisors, grantees in RUFORUM member universities and alumni. It is a platform for peer review, quality control, mentorship, networking and shared learning. The third Biennial Conference was attended by 657 participants.This record contains an extended abstract accepted under the theme of Crop Improvement
Screening of Rice Varieties for their Weed Competitiveness
Abstract:
Weed competition is a major constraint in rice production
systems in Africa. This study was conducted at the Africa Rice
Experimental Station in Benin in the dry and rainy seasons to
screen rice varieties for weed competitiveness. The experiment
was factorial under a a split plot design with 14 contrasting
cultivars planted under three weeding regimes: 0, 1 and 4
weedings. Agro-morphological characters, growth indeces and
weeds were used to evaluate the cultivars. Highly significant
differences (P<0.0001) between cultivars were observed. The
impact of weeds on agro-morphological traits was expressed
through an increasing senescence of plants in relation to the
weeding regime. Weed-competitive cultivars typically showed
a leaf area index less than 3, a high specific leaf area and a
Soil-Plant Analyses development (SPAD) unit less than 30. High
affinities between traits were observed and three types of
descriptors were identified based on their broad sense
heritability. CG20, an O. glaberrima variety was the most
competitive against weeds.
Les mauvaises herbes constituent l’une des principales
contraintes en riziculture en Afrique Sub Saharienne. Les essais
ont été réalisés à la station expérimentale d’AfricaRice. Le
dispositif expérimental utilisé est le split plot et le criblage a été
réalisé à partir de 14 variétés suivant 3 régimes d’enherbement
: 0, 1 et 4 sarclages. Les caractères agro-morphologiques, les
indices de croissance et les adventices ont été mesurés. Des
effets hautement significatifs (0,0001) ont été obtenus entre
variétés. L’impact des adventices sur les caractères agromorphologiques
s’est traduit par une dégénérescence croissante
des plantes en fonction du régime d’enherbement. Un indice
foliaire inférieur à 3, une surface foliaire spécifique grande et
une unité SPAD inférieure à 30 caractérisent les plantescompétitives. Les affinités fortes entre variables ont été mises
en évidence, trois groupes de variables ont été identifiés par
rapport à leur héritabilité et la variété CG 20 (Oryza
glaberrima) s’est révélée la plus compétitive.
Language:
English
Extended abstracts submitted under Crop Improvement
Date of publication:
2012
Country:
Region Focus:
West Africa
Collection:
RUFORUM Conferences and Workshops
Agris Subject Categories:
Agrovoc terms:
Additional keywords:
Licence conditions:
Open Access
Access restriction:
Form:
Printed resource
Publisher:
ISSN:
E_ISSN:
Edition:
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