ACTION OF MICROORGANISMS IN BASALT POWDER

Agriculture, Agrogeology
Conference Proceedings
Azevedo, Antonio Carlos de; Filho, Raul A.; Silva, Lucas Dressano Pereira da
2013
English

Stonemeal is the application of crushed rocks in the soil. The
objective of this work was to observe the action of microorganisms
(inoculated and native) on the mineralization of basalt rock dust and to
measure the elements released into the soil. This assessment was done
by comparing decomposing particles of basalt powder applied to humic
A horizon of a soil derived from granite. The basalt powder was
collected at Cavinatto quarry, situated in Limeira-SP (Brazil). The
experiment is being conducted in vitro, in isolated plastic containers
with the following treatments: 1) soil; 2) sterilized soil; 3) soil without
sterilization and with addition of inoculated microorganisms; 4) same as
the first treatment plus basalt powder; 5) same as the second treatment
plus basalt powder and 6) same as the third treatment plus basalt
powder. The basalt powder was applied in a single dose of 4t/ha. The
experimental units are maintained with 60% field capacity, and leached
every 30 days. The leachate is collected and the elements Zn, Fe, Ca,
Mg and K are determined. The results suggest that the treatments with
basalt powder present greater release of most of the above mentioned
nutrients. The treatments that have the inoculated microorganisms show
greater nutrient solubilization when compared to either the sterile soil
or to the treatment containing soil and native microbiota only. Thus,
partial results indicate a tendency of nutrient levels to increase in
solutions that contain basalt powder since the addition of inoculated
microorganisms appears to stimulate this release. These results suggest
that the combined use of rock dusts and microorganisms has the potential
for commercial use in agricultural production systems.

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