Solubilization of diabase and phonolite dust by filamentous fungus1/Solubilização de pós de diabásio e de fonolito por fungo filamentoso

• Published in: Revista Ceres 2014-09, Vol.61 (5), p.740
• Main Authors: Brandão, Juliana Andréia Vrba, Lopes-Assad, Maria Leonor Ribeiro Casimiro, Ceccato-Antonini, Sandra Regina
• Format: Article
• Language: English
• ISSN: 0034-737X; 2177-3491

The objective of this study was to evaluate the effect of the fungus Aspergillus niger strain CCT4355 in the release of nutrients contained in two types of rock powder (diabase and phonolite) by means of in vitro solubilization trials. The experimental design was completely randomized in a 5 x 4 factorial design with three replications. It was evaluated five treatments was added to 125 mL Erlenmeyer flasks containing 50 mL of liquid culture medium adapted to A. niger. The flasks were incubated at 30 degrees Celsius for 30 days, and analysis of pH (in water), titratable acidity, and concentrations of soluble potassium, calcium, magnesium, zinc, iron and manganese were made. The fungus A. niger was able to produce organic acids that solubilized ions. This result indicates its potential to alter minerals contained in rock dust, with the ability to interact in different ways with the nutrients. A significant increase in the amount of K was found in the treatment with phonolite dust, in the presence of the fungus.