Desempenho agronômico do milho segunda safra em função da cultura antecessora e métodos de inoculação com Azospirillum brasilense

Abstract

The aim of this study was to evaluate the agronomic performance of second crop corn as a function of the predecessor crop and inoculation with Azospirillum brasilense. The experiment was conducted in the experimental field of the Federal University of Goiás / Jataí Regional. The experimental design was a randomized complete block design with four replications. The plots were composed by the predecessor crops sown in the summer crop soybean and beans without inoculation and brachiaria with and without inoculation (Azospirillum brasilense) and the subplots were constituted by maize second crop with and without inoculation with Azospirillum brasilense. Soybean before maize without inoculation provided a larger stem diameter and corn with inoculation was superior to maize without inoculation only for bean treatments as a predecessor crop. The soybean before corn with inoculation, provided greater activity of the enzyme nitrate reductase. The inoculation with Azospirillum brasilense in maize resulted in higher activity of nitrate reductase enzyme in relation to maize without inoculation on soybean and brachiaria. Soybean and beans provided higher crude protein content in maize. The corn with inoculation showed a greater mass of one thousand grains, in the predecessor crop soybean and beans. Maize with inoculation was superior to maize without inoculation only where the predecessor crop was soybean for the mass of a thousand grains. The residues of the predecessor crop provide changes in the physiological, morphological and production components, without altering the yield of corn grains. The inoculation with Azospirillum brasilense in corn provides benefits to the development of the plants, however, it is not enough to provide gains in grain yield.