Two experiments were carried out in Coimbra MG, during consecutive years from March to July, aiming to evaluate the possible interaction provided by the mixture of molybdic fertilizer and herbicides in relation to productivity and weed control in bean crop, cv. 'Meia Noite' a split-plot randomized block experimental design was used with four replicates The plots were represented by the absence and presence of weeding. The split plots were represented by the treatments with the herbicides metolachlor, fomesafen, bentazon, imazamox and fluazifop-p-butyl + fomesafen, as well as the non-weeded control weeded controls associated or not to molybdenum. At 23 days after bean crop emergence, molybdenum was applied at the dosage of 80 g ha¹ in all treatments. In plots on which the herbicides were applied at post-emergence, molybdenum was applied in a mixture made in a sprayer tank with herbicides and in plots on which the herbicide was applied at pre-emergence. In those receiving no herbicide, molybdenum was separately applied. Ammonium molybdate was used as a molybdenum source. The following observations were made: molybdenum may be mixed with the studied herbicides; even when mixed, molybdenum increases productivity; the herbicides metolachlor + bentazon, fluazifop-p-butyl + fomesafen and imazamox showed a very good to excellent control against Ipomoea grandifolia, Brachiaria plantaginea and Acanthospermum hispidum. No reduction was observed in controlling all the weed species present in both experiments, when molybdenum was mixed to the syrup.
chemical control; molybdenum; tank mixture; weeds
