Biodegradability of calcareous phosphate mixtures with organic manures on an acid soil
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Abstract
different organic substrates as vermicompost (HL), cattle
manure (EV) and pig slurry (EP) on soil biological indicators
was studied, with the aim of measuring its biodegradability
and fertility influence, mainly related to mineral nitrogen
availability. The dynamics of NO3
- formation was determined,
whereas NH4
+ and NO3
- contents were extracted and quantified
in total soil matter. Data were processed through an ANOVA
for a random trifactorial arrangement. Duncan�??s Multiple Range
test was used as a criterion of differences between treatment
means for all variants analyzed. Results showed that calcareous
phosphate mixtures with HL, EV and EP stimulate soil
microbiological activity and support those microbiological
processes associated to organic nitrogen mineralization.
Mixture biodegradability depended more on the calcareous
phosphate proportion than on substrate quantity.
Independently that the mixtures made up with EV and EP
caused a greater effect on microbiological processes, the
mixture with HL had a similar decomposition pattern to the
control soil, which means that it does not cause marked
microflora changes; therefore, it provokes a smaller soil
biological balance disorder.
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