DESEMPENHO DE DIFERENTES GENÓTIPOS DE MILHO NO SUL GOIANO - SEGUNDA SAFRA 2017

Abstract

The use of genetic resistance allowed maize to cease to be important during the last decade for the maize crop, returning to stand out in the safrinha, which has growth potential. The objective of this study was to analyze eighteen maize genotypes cultivated in southern Goiás and to classify the tolerance to the diseases: corn streak, enfezamento complex (pale squatting, red squatting) and helmintosporiose; the morphology suitable for the composition of modern hybrids and final productivity. The experiment was carried out with 18 maize hybrids, conducted in a randomized block design, with two replicates, totaling 36 experimental units. Assessments of disease severity were performed at distinct stages, both before and after tipping. The evaluation of opening angle of the 1st and 2nd leaves above the spike, plant length and insertion of the first spike, after the emission of the flag leaf and post harvest yield. The 60XB14 material was the most productive, yielding 9124.5 bags.ha-1 and the SX7772 68.91% less, and obtained better assessments in its architecture and disease tolerance. It is concluded that, among the evaluations carried out in the hybrids in the southern region of Goiás, the variety 60XB14 stands out as the best material for cultivation in the summer.