Uso de Bacillus megaterium e B. subtilis e adubação fosfatada na produtividade do milho

Abstract

Corn is the most produced grain in the world and phosphorus is the third most required element by the cereal. However, phosphorus in the soil undergoes several interactions with the mineral fraction, forming compounds with Fe, Al and Ca that often limit its availability to plants. Bacillus megaterium and B. subtilis have the ability to solubilize this P, making it available to plants. Therefore, this work aims to evaluate the effect of phosphorus solubilizing bacteria, B. megaterium and B. subtilis in corn. The work was carried out in the municipality of Doutor Maurício Cardoso (RS) in an oxisol with very high P content, using a completely randomized design (DIC), consisting of five treatments and four replications. The treatments were 0PSI (0% of the P dose without inoculation), 0PCI (0% of the P dose with inoculation), 50PCI (50% of the P dose with inoculation), 100PSI (100% of the P dose without inoculation) and 100PCI (100% of P dose with inoculation). The treatments 50PCI, 100PSI and 100PCI showed the highest plant heights at 25 and 50 DAE, indicating a significant effect of P doses and a non-significant effect of inoculation on this variable. P doses and inoculation did not influence corn yield and yield components. The addition of P presented economic viability, as well as the inoculation in the treatment without P, while in the 100% of the P dose the inoculation was not economically viable.