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Upland Crops
Effect of tillage on upland crops and weeds in Claveria, Misamis
Oriental, Philippines
P.C. Elliot, H.S. Franjie and K. Moody
Summary
Three separate field trials were conducted in Claveria, Misamis oriental, in 1986 dry season to determine the effect of number of plowings and harrowing on weed growth and yields of rice, maize and cowpea 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 copea. Rottboellia cochichinensis (Lour.) W.D. Clayton and Borreria laevis (Lam). Griseb, were the dominant weed species in rice irrespective of tillage level.
However, R. cochichinensis decreased as tillage level increased. In maize, R. cochichinensis was observed only at lowest tillage level. In cowpea, both B. laevis and R. cochinchinensis increased as the number of harrowings increased. Yields of rice and cowpea were not affected by the different land preparation treatments. In contract, maize yields increased in 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.
Information provided by Dr G. Magsino
Source: Philipp. J. Weed Sci., Vol. 20:62-71