The present work had as an objective to study the hehavior of seven corn cultivars, according to the inteference of weed plants. So that, the seven corn cultivars (ESALQ VF-7, ESALQ VF-8, COMPOSTOS ARQUITETURA, FLINT E DENTADO, PIRANÃO and CARGILL 501) were submitted to 2 kinds of interference; with na without, totalizing fourteen treatments organized in a factorial plan (7x2), installed in the field as a experimental design of casual blocks with four replications. The infest community, that the most important species were SIDCO, BRAPL and ELEIN, already estabilished fourteen days after the sowing, beginning competition after thirty five days. The cultivars CD and CF presented a higher plant height than the othercultivars. The weed interference decreased the weight of grain and ear yield, the ear legth and circunference and the distance from the soil to first ear. The cultivars PIR and ARQ independent of the interference, showed to be the less producible. The cultivar CARG showed to be the most producible, even when with weed interference. The cultivar ARQ was the most sensitive in relation to the interference, while PIR and VF-7 were the less, showing that these cultivars present potentiality to be used a genetic improve program, aiming tolerance to weed plants inteference.
Zea mays; weed competition