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The present work was undertaken to evaluate volunteer corn control through the application of graminicides singly or combined with boron (B) sources as well as to assess the sunflower ( Helianthus annuus  L . ) response to the application of this micronutrient. Experiments were arranged in a split-plot design with randomized complete blocks and five replications. The treatments applied were haloxyfop-methyl 0.048 kg a.i. ha -1  plus 0.5% (v/v) mineral oil, sethoxydim 0.22 kg a.i. ha -1  plus 0.5% (v/v) mineral oil, clethodim 0.12 kg a.i. ha -1  plus 0.5% (v/v) mineral oil, fluazifop-p-butyl 0.187 kg a.i. ha -1  and the hand-hoed control. The sub-plots consisted of the absence or presence of 400 g ha -1  of B from two sources (H 3 BO 3 -boric acid and Na 2 B 8 O 13 .4H 2 O-sodium borate), applied with the herbicides. All herbicides applied singly or combined with the two B sources were selective for the sunflower crop and efficient in controlling volunteer corn. The application of B in association with herbicides increased the content of this micronutrient in sunflower leaves.

helia

BORON FOLIAR APPLICATION ON SUNFLOWER (Helianthus annuus L.) ASSOCIATED WITH HERBICIDES / APLICACIÓN FOLIAR DE BORO EN GIRASOL (Helianthus annuus L.) ASOCIADA A HERBICIDAS / APPLICATION FOLIAR DE BORE SUR LÊ TOURNESOL (Helianthus annuus) ASSOCIÉ AUX HERBICIDES