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URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/3352
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Item Coffee silverskin and expired coffee powder used as organic fertilizers(Editora UFLA, 2019-01) Carnier, Ruan; Berton, Ronaldo Severiano; Coscione, Aline Renee; Pires, Adriana Marlene Moreno; Corbo, Jessica ZuanazziThe coffee industry produces a wide range of organic wastes, some in large amounts, and most of them do not have a well-defined final disposal. The agricultural use of these wastes can be based on the recycling of nitrogen (N), but their chemical characterization and evaluation with soil under controlled conditions are required. The aim in this work was to evaluate the use of coffee silverskin and expired coffee powder as organic fertilizers. The wastes were chemically characterized according to CONAMA’S resolution No. 375 and passed through Brazil’s Agriculture Ministry normative for organic fertilizers. A greenhouse experiment with Rhodic Ferralsol soil and maize as a model plant was carried out to obtain the agronomic efficiency index (AEI) for nitrogen. Three treatments were considered: one control (without waste), ammonium nitrate as a mineral reference, and both organic wastes, at a dose of 450 mg of Kjeldahl nitrogen per pot, in triplicate. The characterization results were favorable to the wastes as nitrogen sources for agriculture. However, the AEIs obtained were low (0.5 and 7.9% for the expired coffee powder and the coffee silverskin, respectively) compared to that of the mineral reference (92%). Although coffee silverskin and expired coffee powder showed nitrogen levels were well above the minimum require by normative (0.5 % m/m), its use as organic fertilizers (as exclusive sources of N) is not recommended since less than 10% of N was available as showed by the AEI index.