Effect of tillage on upland crops and weeds in Claveria, Misamis Oriental [Philippines]
1993
Elliot, P.C. | Franje, H.S. | Moody, K. (International Rice Research Inst., Los Banos, Laguna (Philippines))
Three separate field trials were conducted in Claveria, Misamis Oriental [Philippines], in 1986 dry season to determine the effect of number of plowings and harrowings on weed growth and yields of rice (Oryza sativa L.), maize (Zea mays L.), and cowpea [Vigna unguiculata (L.) Walp.] in the following wet season. In rice and maize, weed weights were reduced and less time was spent for weeding as number of plowings and harrowings increased. The reverse was observed with cowpea. Rottboellia cochinchinensis (Lour.) W.D. Clayton and Borreria laevis (Lam.) Griseb. were the dominant weed species in rice irrespective of tillage level. However, R. cochinchinensis decreased as tillage level increased. In maize, R. cochinchinensis was observed only at the lowest tillage level. In cowpea, both B. Laevis and R. cochinchinensis increased as the number of harrowing increased. Yields of rice and cowpea were not affected by the different land preparation treatments. In contrast, maize yields increase in the hand-weeded plots as the tillage level increased. Hand weeding increased yields in all crops. Increasing the number of plowing and harrowing operations during the dry season gave slight benefits in terms of reduced weeding time and increased crop yields
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