Full Length Research Paper
Abstract
Weed herbicide resistance threatens the sustainability of the world’s rice. This study aims to select high-yielding and competitive rice genotypes against weeds. It was conducted at the PNSAV-PV research station in Kougouleu. The experimental design was a split plot, with the main factor being the weed regime and the secondary factor comprising fifteen genotypes during two consecutive rainfall seasons. Parameters were recorded for rice tolerance based on weed density and species. Some accessions avoided weed competition and exhibited early heading. Weed presence decreased the number of tillers at 60 DAS, plant height at maturity, days to maturity, and grain yield by 45.56, 14.60, 5, and 65.37%, respectively. The two most invasive species were Eleusine indica and Cyperus rotundus. These species had a density of 75 and 69 individuals per square meter, an abundance-dominance index (ADI) of 3, a coverage percentage of 42.90 and 39.33%, and a relative frequency (rF) of 100%, respectively. At 45 DAS, E. indica and C. rotundus remained the most prevalent, with (110, 95), (3, 3), (44.18%, 38.15%), and (91.67%, 95.83%) as sdensity per meter square, ADI, coverage, and rF, respectively. The most weed-tolerant accessions identified were CG20, HR32063F1-2-65-1, HR32061F1-2-41-1, HR32061F1-1-61-1, and HR32051F1-1-13-1.
Key words: density, improvement, screening, weed regime, weed species, accessions, rice
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