A field experiment was conducted, during the dry season of 1995, on alluvial soil of the Vale do Curu Experimental Farm, State of Ceara, Brazil, in order to evaluate the effect of the herbicides: propanil (4.8 kg a.i.ha-1), fenoxapropethyl (0.14 kg a.i.ha-1), fenoxaprop-p-ethyl (0.11 kg a.i.ha-1), oxadiazon (0.62 kg a.i.ha-1) and the mixtures propanil + molinate (2.52+2.52 kg a.i.ha-1 ) and propanil + 2,4-D (2.72+0.22 kg a.i.ha-1) on the control of weeds in rice, cultivars METICA-1 and CICA-8, growing under flood irrigation. The best weed control and paddy rice yield were provided by propanil and the mixtures propanil + 2,4-D and propanil + molinate. Plant height, days to flowering, head size and the weight of 1000 seeds were not affected by the herbicides. The symptoms of toxicity caused by the herbicides on the rice plants of the two cultivars were slightly severe.
Oryza sativa; herbicides; irrigation; toxicity