The purpose of this study was to evaluate interspecific competition with maize sowing 21 days after the establishment of forages, for the formation of the maize-forage consortium or association, using hybrid S1 Geneze 'safrinha' maize with forages: Brachiaria brizantha cv. Marandu; Brachiaria brizantha cv. Piatã; Brachiaria humidicola cv. Llanero and Panicum maximum cv. Mombasa, and its monocultures, in randomized blocks. Regarding interspecific competition, the Marandu and Mombaça grasses did not allow the development of corn beyond the V5 phenological stage, which did not happen with the Piatã and Llanero cultivars. The corn-Llanero association caused reductions in dry matter productivity for both crops. The maize-Piatã association, on the other hand, did not negatively influence the productivity of forage, but reduced that of corn by 59.7%. The competitive conditions between the plant associations generated different effects in relation to height. Considering the corn (186.5 cm) and Llanero (104 cm) monocultures, the association of these plants promoted a 53% reduction in forage height, but did not significantly affect that of the cereal. The opposite was observed when in the presence of Piatã grass, which did not have a significantly reduced height (141.5 cm), however significantly reduced that of corn (164 cm). These associations did not affect the mass of 100 grains and the insertion of the 1st ear, but significantly reduced stem diameter, number of grains and grain yield adjusted to 15.5% humidity. The higher harvest index of the
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