Organic substrate bioestability under modelling conditions
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Abstract
The organoponic modalities and intensive gardens which are developed thoroughly all over country demand the use of high amounts of substrates. The objective of this research was to know the bioestability of organic substrates under modeling conditions. Samples previously weighted and placed in mesh plastic bags were buried in Red Ferralitic soils under two treatments: I) natural conditions (forest) and II) cultivated for five months. Every month a given number of bags were removed to measure the loss of substrate mass. The materials employed were: worm humus, compost, bovine manure, residuals wheat, rice husks and pine sawdust. It was observed that the organic fertilizer lose almost half of their initial mass in the first month since they were constituted mainly by the binary products of the mineralization of the original organic source and of microbial re-synthesis. However, the plant residuals remained a longer time due to their high C/N relationship, which require two stages of decomposition. The first one is characterized by a rapid mineralization of the labile components, which was identified by a volume increase of the original mass. This contributes to increase the time between organic matter applications in gardens and to favor the physical properties of the substrates.
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