Influence of weed-control practices in the first crop on the tillage requirements for the succeeding crops in an upland rice-maize-cowpea cropping sequence uri icon

abstract

  • The influence of weed-control practices applied in the first crop [upland rice (Oryza sativa L.)] on the tillage requirements of the succeeding crops was studied during the 1987 cropping season in Claveria, Misamis Oriental, Philippines. All the weed-control practices applied in upland rice significantly reduced weed weights and resulted in significantly higher grain yields than those obtained from the unweeded plot. Grain yields obtained when there were two or three weedings were similar. Three weedings and a pre-emergence application of pendimethalin plus hand weeding kept the rice crop free until harvest. This enabled the early establishment of the maize (Zea mays L.) crop using zero tillage. The other weeding treatments required the usual ploughing and harrowing operations to establish the maize crop. Zero tillage could be used for cowpea [Vigna unguiculata (L.) Walp.] establishment provided that there were at least two weeding operations in maize. In an upland rice-maize-cowpea cropping sequence, pre-emergence application of pendimethalin plus hand weeding in upland rice, zero tillage for maize establishment, and spot weeding at 14 days after emergence (DAE) in maize, and zero-tillage establishment for cowpea plus hoe weeding at 14 DAE resulted in the lowest cost for weed control and the highest net return and highest marginal benefit-cost ratio.

publication date

  • 1991
  • 1991
  • 1991