Periódicos
URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/3352
Navegar
2 resultados
Resultados da Pesquisa
Item Coffee industry waste-derived biochar: characterization and agricultural use evaluation according to Brazilian legislation(Instituto Agronômico (IAC), 2021-09-13) Carnier, Ruan; Coscione, Aline Renee; Delaqua, Douglas; Abreu, Cleide Aparecida deThe agricultural use of biochar has been the focus of much research in the last decade due to the improvement of soil chemical, physical, and biological attributes. Nonetheless, Brazil still has no specific legislation for biochar, limiting its agricultural use. The objective of the present work is to evaluate the use of biochar produced from spent coffee grounds (SCG) and coffee parchment (CP) by slow pyrolysis at 700 °C according to the existing framework of the Brazilian Ministry of Agriculture, Livestock, and Food Supply (MAPA) legislation for organic fertilizer, soil conditioner or plant substrate. Biochar was characterized according to normative instructions No. 17, 31, 61, 7, 5 and 35. Although not required by the addressed legislation, the semitotal content of macro- and micronutrients was also determined. While CP biochar could be used as an organic fertilizer or plant substrate, SCG biochar, due to its higher Ni content and lower than required cation exchange capacity (CEC), did not meet MAPA legislation criteria to allow for its agricultural use. Future regulations can be based on the current standards, and structural attributes, such as total C content, particle size distribution, and complete macro- and micronutrient determination should be included. Further research may also indicate the viability of biochar use as a soil conditioner based on a more representative set of biomasses with a higher CEC. These considerations will help to take advantage of the benefits of biochar to soil, contributing to a circular economy, which is still at a difficult stage in Brazil.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.