DESEMPENHO DE HÍBRIDOS DE MULHO COM E SEM CONSÓRCIO COM Urochloa ruziziensis E SELETIVIDADE A HERBICIDAS

Abstract

The objective of this work was to evaluate the performance of corn hybrids AG8061 and AG8480 with and without intercropping with U. ruziziensis and the selectivity of herbicides used for brachiaria and chemical weed control in the intercropping of corn with U. . ruziziensis. Two experiments were carried out in the experimental area of ​​the Institute of Science and Technology – COMIGO, Rio Verde – GO and consisted of two corn hybrids: AG8061 and AG8480. The experiments were carried out in a randomized block design, with 8 replications. The treatments consisted of the application of three treatments: atrazine + mesotrione, atrazine + mesotrione + seq. nicosulfuron and atrazine + glyphosate (without intercropping), totaling 24 experimental units with dimensions of 8.6 x 6.0 m (51.6 m²). The intercropping corn with brachiaria did not affect stem diameter, plant height, ear insertion height and corn plant population in both hybrids. The intercropping corn and brachiaria reduced from 11.3% to 14.2% the grain yield of the hybrid AG8061 compared to the monoculture of the same hybrid. The hybrid AG8480 reduced from 16% to 19% the intercropping grain yield. When U. ruziziensis intercropped with the two corn hybrids, it increased total residual dry biomass in the soil and the herbicides did not cause plant death, reaching satisfactory levels of biomass.

Keywords: weeds, biomass, productivity