Weed competitiveness and yield of inter-and intraspecific upland rice (Oryza sativa L.) under different weed control practices at Badeggi, Niger State, Nigeria

摘要

A field study was conducted at the National Cereals Research Institute, Badeggi (9°04 N, 6°7 E), Niger ia?in 2007 and 2008 to compare the weed competitiveness and yield of inter- and intra-specific upland rice?(Oryza sativa L.) under different weed control practices. The trial was laid out in a split-plot and?arranged in a randomized block design with the two varieties of rice NERICA 1 (inter-specific) and?FARO 46 (intra-specific) assigned to the main plot, while seven weed control treatments (hoe weeding?once at 25 or 45 days after sowing (DAS), twice at 25 and 45 DAS, thrice at 25, 45 and 65 DAS,?application of 3,3-dichloropropionanilide+2,4-dichlorophenoxy acetic acid (orizo plus? by Candel) at 3.5?kg a.i ha-1 at 25 DAS, hoe weeding at 25 DAS followed by orizo plus? at 3.5 kg a.i ha-1 at 45 DAS and a?weedy check (control)) constituted the sub-plots. The treatments were replicated three times. The?results indicated that the rice variety NERICA 1 had better weed suppression ability and higher grain?yield (3.1 t ha-1) than FARO 46 (2.4 t ha-1). Weed control was better when hoe weeding was done thrice?and twice and hoe weeding at 25 DAS followed by application of orizo plus? at 45 DAS, in that order,?than other treatments. It is concluded that inter-specific NERICA 1 was more weed suppressive and?produced greater grain yield than its counterpart.