Efeito de diferentes períodos de controle das plantas daninhas na produtividade da cultura da cebola

摘要: An experiment was carried out in Monte Alto, SP to study the effects of different weed control periods on yield onion (Allium cepa) bulb, 'Mercedes' cultivar, under transplanting system. The arranged a completely randomized block design, with four replications. treatments were 4 x 6 factorial design initial removal (after until 0, 7, 14 and 21 days) six final (from 28, 42, 56, 70, 84 or 98 days after harvest). Two controls adapted without throughout cycle. Lycopersicon esculentum, Portulaca oleracea, Eragrostis pilosa Galinsoga parviflora most important weeds area. No interaction occurred between controls. Weed should be maintained DAT restarted at 28 prevent significant reductions relation weeding. interference cycle reduced 94.5%.