Determining suitable weed control approaches in an upland rice-cowpea intercrop
1990
Elliot, P.C. | Moody, K. | Franje, H.S. (International Rice Research Inst., Los Banos, Laguna (Philippines))
An experiment was conducted to determine suitable weed control approaches in intercropped upland IR30716-B-1-B-1-2 rice (Oryza sativa L.) and IT82D-889 cowpea [Vigna unguiculata (L.) Walp.] during the 1989 wet season in Ane-i, Claveria, Misamis Oriental [Philippines]. The dominant weed species associated with the crops were Borreria laevis (Lam.) Grised and Rottboellia cochinchinensis (Lour.) W.D. Clayton. Controlling the weeds entirely by interrow cultivation (IRC) plus hand weeding at 14 days after emergence (DAE) followed by partial weeding at 28 DAE significantly reduced weed weights and produced more productive rice tillers. Consequently, this approach resulted in higher yields of upland rice and cowpea. The well-developed cowpea canopy after weeding at DAE helped suppress weed growth. This treatment required only partial weeding at 28 DAE. It gave one of the highest net returns, the highest marginal benefit-cost ratio (MBCR), and the highest marginal rate of return (MRR).
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