Competitiveness of different cultivars against weeds in upland rice
1990
Chavez, R.C. | Moody, K. (International Rice Research Inst., Los Banos, Laguna (Philippines))
Four field trials conducted at Claveria, Misamis Oriental [Philippines] during the wet seasons of 1987 and 1988 determined cultivar competitiveness against weeds in upland rice (Oryza sativa L.). The dominant weed species were the grasses Rottboellia cochinchinensis (Lour.) N.D. Clayton, Digitaria setigera Roth ex R. and S., Pennisetum polystachyon (L.) Schult., Eleusine indica (L.) Gaertn., and the broadleaved weeds Bidens pilosa L. and Borreria laevis (Lam.) Griseb. There was a significant interaction effect between cultivar and weeding level on rice grain yield. Different cultivars responded differently as the level of weeding changed. Significantly higher yields were obtained for all cultivars when 2 or 3 hand weedings were done. Different cultivars required different levels of hand weeding to achieve their optimum yields. Among the IR cultivars, there was no particular plant type which showed consistent competitiveness. Generally, the traditional cultivar commonly used by farmers in the Claveria area had a higher competitive ability against weeds than the other cultivars tested. UPL Ri-5 and IR 10147-113-1-1-5 can possibly replace the traditional cultivars Speaker and Dinorado because of their high yield potential across all weeding levels. However, these cultivars required three hand weedings to attain their maximum yield potential.
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