Abstract

CARNIER, Ruan et al. Acid hydrolysis method on the availability of nitrogen in organic wastes. Rev. de Ciências Agrárias [online]. 2019, vol.42, n.3, pp.21-30. ISSN 0871-018X.  https://doi.org/10.19084/rca.15278.

The nitrogen (N) available for plants from organic residues is usually estimated by greenhouse or aerobic incubation experiments. These methods are laborious, expensive and impracticable for laboratory routines, requiring alternative approaches. Following the hypothesis of positive relation between organic fractions and available N, the aim of this work was to evaluate the acid hydrolysis as an alternative method in comparison to the N absorbed by maize on a greenhouse experiment for 10 organic wastes. The acid hydrolysis fractionated the N of the wastes’ organic matter in labile and recalcitrant pools, which was compared to the amount of N absorbed by the plants measured by nitrogen recuperation index (NRI). There was a significant relationship between the labile pool 1 (R² = 0,86; p=0,008) and total labile pool (R² = 0,89; p=0,004) and the NRI values for the coffee silverskin, chicken and cattle manure, expired coffee powder, peat and poultry litter wastes.

Keywords : alternative method; chemical fractionation; nitrogen absorption.

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