Desenvolvimento do milho (Zea mays L.) com o uso de bactérias promotoras do crescimento em diferentes tipos de solo

Abstract

Phosphorus availability is one of the biggest limitations to obtaining high corn yield. In this sense, bacteria that promote growth and solubilize phosphorus (P) may play an important role in plant nutrition allowing better development. Thus, the objective of this work was to evaluate the effect of the bacteria Azospirillum brasilense, Bacillus subtilis + megaterium and Bacillus subtilis + megaterium with Azospirillum on the development of corn plants, in different types of soils with high (27.7 mg dm³) and low phosphorus content (1.64 mg dm³), clayey and mixed (50% sand). Corn plants in treatments with B. subtilis + B. megaterium showed higher levels of Chlorophyll A, indicating superior efficacy of these microorganisms, regardless of soil types and phosphorus levels. There were no significant differences in the parameters of the aerial part of the plants between the results, with differences being distributed between soil fertility levels, alongside soils with higher phosphorus contents, especially in clayey soil and jointly evaluated as the best. As for roots, treatments with Azospirillum and the combination of B. subtilis + B. megaterium with Azospirillum resulted in longer and heavier roots, observed in both high-P and mixed high-P soil.