Competition of bearded sprangletop (Leptochloa fascicularis) with rice (Oryza sativa).
In field trials in 1977-9, yields of drill-sown lowland rice cv. Lebonnet at opt. stands of 215-270 plants/m2 were reduced 9, 18, 20 and 36% by L. fascicularis densities of 11, 22, 54 and 108 plants/m2, resp. There was a linear decrease in rice grain yield of the equivalent of 21 kg/ha for each L. fascicularis plant/m2. Weed densities of 54 and 108 plants/m2 reduced yields of whole milled grain and a density of 108 plants/m2 reduced germination. The number of panicles produced by each L. fascicularis plant decreased as the weed density increased.