A screening protocol for developing high-yielding upland rice varieties with superior weed-suppressive ability

摘要: Abstract In West Africa, upland rice ( Oryza spp.) is mainly grown in low-input systems by resource-poor farmers. Weeds are one of the major constraints to production. Ideal varieties high-yielding with strong weed-suppressive ability (WSA). WSA suppress weed growth and reduce seed production determined assessing biomass under weedy conditions. Development such requires simple screening protocols based on highly heritable traits, which can be evaluated small plots weed-free Then, later stages breeding program, selected lines could substitute weeds instead natural weeds, as heterogeneous. To develop a protocol, I agronomic traits 10 diverse different numbers rows (unbordered 1-row 2-row, self-bordered 4-row, middle 2-rows were sampled) without competition these cowpea weeds. then examined whether unbordered predict yield plots. Broad-sense heritabilities measured conditions estimated. Among plots, was positively correlated r  = 0.88 0.96 2-row respectively, P