This paper reports on two years field trials carried out in Araras, SP, Brazil, on coffee tress with twenty months of age, on clay soil. The herbicides studied were metribuzin at 0.28; 0.42; 0.56 and 0.70 kg/ha; metribuzin plus napropamide at 0.28 + 4.00 kg/ha; metribuzin plus pendimethalin at 0.28 + 1.00 kg/ha; metribuzin plua alachlor at 0.28 + 2.40 kg/ha; metribuzin plus oryzalin at 0.28 + 1.50 kg/ha and metribuzin plus diuron at 0.28 + 0.80 kg/ha. The applications were done in preemergence in March/79 and February/80. The weeds were represented by Digitaria sanguinalis, Brachiaria plantaginea, Elcusine indica, Rhynchelitrum roseum, Portulaca oleracea, Galinsoga parviflora, Amaranthus viridis, Euphorbia heterophylla, Bidens pilosa, Lepidium virginicum, Plyllanthus corvadensis and Emilia sanchifolia. The treatments that represented the longest action after 210 days of herbicides application was metribuzin plua napropamide, followed by metribuzin plus oryzalin. No injury was observed by the herbicides on the coffee trees.
metribuzin; herbicide mixtures; young cofe trees