Application of molybdenum and a desiccant herbicide to the common bean under direct seeding

Resumo

Applying micronutrients together with the herbicides used in plant desiccation can ensure an adequate
supply of these nutrients and a reduction in production costs under a direct seeding (DSS) system. The aim of this
study was to evaluate the effect of dosages of molybdenum (Mo), applied both in a desiccation operation together with
glyphosate on the straw of brachiaria (Brachiaria brizantha) and separately via the leaves, on the common bean (cultivar
Ouro Vermelho) grown under DSS. A randomised block design was used with four replications in an arrangement of
sublots. In the lots, dosages of Mo (0, 0.1, 0.2, 0.4 and 0.8 kg ha-1) were applied together with the desiccant herbicide
(glyphosate), and in the sublots, two dosages of Mo (0 and 100 g ha-1) were applied via the leaves. Two experiments
were carried out in the town of Coimbra, in the state of Minas Gerais, Brazil, one in 2009 and the other in 2010 (the
same treatments having been applied in the experimental area in 2008). Foliar fertilization was carried out with sodium
molybdate [(Na2MoO4
) (39% Mo)] at stage V4 in the bean plants. The application of Mo, whether mixed with the
desiccant or applied via the leaves, had no significant effect on yield components or on productivity. Levels of Mo and N in the
grain, and of N in the leaves, increased with the application of Mo, both when mixed with the desiccant and applied via the leaves.