Periódicos
URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/3352
Navegar
2 resultados
Resultados da Pesquisa
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.Item Produtividade do cafeeiro Mundo Novo enxertado e submetido à adubação verde antes e após recepa da lavoura(Instituto Agronômico (IAC), 2006-01) Paulo, Edison Martins; Berton, Ronaldo Severiano; Cavichioli, José Carlos; Bulisani, Eduardo Antonio; Kasai, Francisco SeiitiEstudaram-se a produção e o crescimento do cafeeiro Mundo Novo (Coffea arabica L.) enxertado sobre o Apoatã IAC 2258 (Coffea canephora Pierre ex Froehner) submetido à adubação verde com as seguintes espécies leguminosas: crotalária espectábilis (Crotalaria spectabilis Roth.), crotalária júncea (Crotalaria juncea L.), guandu [Cajanus cajan (L.) Millsp.], mucuna anã (Stizolobium deeringeanum Bort.) e soja IAC 9 [Glycine max (L.) Merril] e um tratamento testemunha sem plantas leguminosas. As leguminosas foram semeadas a 50 cm da projeção da copa dos cafeeiros e incorporadas no florescimento. O experimento foi desenvolvido no Pólo Regional de Desenvolvimento Tecnológico dos Agronegócios da Alta Paulista, em Adamantina, no período de 1989 a 1995. Adotou-se o delineamento estatístico de blocos ao acaso com seis tratamentos e cinco repetições. Os adubos verdes crotalária espectábilis, crotalária júncea, mucuna anã e soja, durante o período experimental, e a crotalária espectábilis após a recepa, não diminuíram a produção do cafeeiro. O guandu, embora tenha aumentado o teor de matéria orgânica do solo, foi a única leguminosa que diminuiu a produção e o diâmetro do caule dos cafeeiros. O guandu e a crotalária júncea, respectivamente, produziram as maiores quantidades de fitomassa seca. A produção do café se correlacionou inversamente com a fitomassa seca das leguminosas e positivamente com altura e diâmetro do caule do cafeeiro.