de DBO não causou elevação das concentrações dos contaminantes a níveis críticos, durante o período experimental e, portanto, podem ser utilizadas. Entretanto, é recomendável um monitoramento de longo prazo das características químicas do solo, bem como das águas subterrâneas para que se avaliem os riscos de contaminação ambiental se a disposição for feita em área externa ao aterro sanitário. of BOD provided no elevation of contaminant concentrations to critical levels during the experiment period and, therefore, these rates can be used. However, we recommend a long term monitoring of soil chemical characteristics and groundwater in order to assess environmental contamination risks if disposal was done outside landfill.
It is undeniable which soil management systems with intensive use of machines and with little formation of organic matter result in the deterioration of the soil structure. The relation among the values of organic matter in the soil profile as function of the quantity of residue left on the soil surface during the harvest has been little documented. This evaluation will be very important to provide and to apply the best optimization model of the soil management system. The objective of this work was to value the contribution of the mulch cover of maize and oat straw, applied in the soil surface at different quantities and of the soil textural porosity at the change of the soil structural porosity. The experiment was carried out from August to November 2005 on a Oxisol, with clay texture, located at the Experiment Farm of Agricultural Engineering from the UNIOESTE, Cascavel, Paraná, Brazil (24°54′ S; 53°31′ W). The average soil texture in top 20 cm was 126, 195 and 679 g kg-1 of sand, silt and clay respectively. Aggregates sizes distribution, soil bulk density, particles density and textural density and soil organic matter were determined at the laboratory for evaluation of the soil structural parameters. For all conditions: application rates, and distribution in the layers of soil depth, the cover with oat straw produced more organic matter and presented a positive effect faster on the soil structural voids ratio than the coverage with maize straw.
PERCOLADO DE ATERRO SANITÁRIO NO CULTIVO DA MAMONEIRA: ALTERAÇÕES QUÍMICAS EM ARGISSOLO VERMELHO-AMARELO* JERÔNIMO ANDRADE FILHO1; NILDO DA SILVA DIAS2; RAFAEL OLIVEIRA BATISTA3; JOSÉ FRACISMAR DE MEDEIROS2; JOSÉ AMILTON SANTOS JÚNIOR4; ANA LUÍZA LIMA FERREIRA5 *Artigo extraído da Tese de Doutorado do primeiro autor 1Instituto Federal de Ciência e Tecnologia do Rio Grande do Norte, Rua Raimundo Firmino de Oliveira, 400 - Conj. Ulrick Graff, Mossoró-RN, CEP: 59.628-330, Email:andrade.filho@ifrn.edu.br 2Departamento de Ciências Agronômicas e Florestais, Universidade Federal Rural do Semiárido, Av. Francisco Mota, 572 - Bairro Costa e Silva, Mossoró-RN, CEP: 59.625-900, Email: nildodias@ufersa.edu.br; jfmedeir@ufersa.edu.br 3Departamento de Engenharia e Ciências Ambientais, Universidade Federal Rural do Semiárido, Av. Francisco Mota, 572 - Bairro Costa e Silva, Mossoró-RN, E mail: rafaelbatista@ufersa.edu.br 4Departamento de Engenharia Agrícola, Universidade Federal Rural de Pernambuco, R. Manuel de Medeiros, s/n - Dois Irmãos, Recife - PE, CEP: 52171-900, E mail: eng.amiltonjr@hotmail.com 5Escola Superior de Agricultura Luiz de Queiroz, Av. Pádua Dias, 11 - Cx. Postal 9 - Piracicaba – SP, CEP: 13418-900 E mail: luizaferreira@usp.br 1 RESUMO O aproveitamento agrícola do percolado de aterro sanitário pode mitigar certos impactos ambientais, sobretudo quando eventuais alterações químicas no solo são monitoradas. Dito isto, em Mossoró-RN (5º11’31’’S, 37º20’40’’O), entre setembro de 2014 e janeiro de 2015, desenvolveu-se esta pesquisa, com o objetivo de quantificar alterações nas características químicas de um Argissolo vermelho-amarelo Eutrófico cultivado com plantas de mamona (Ricinus communis L.) que receberam aplicação de percolado de aterro sanitário. O experimento foi conduzido em blocos casualizados com cinco tratamentos e quatro repetições; do total da demanda hídrica da cultura, aplicou-se inicialmente percentuais (0; 20; 40; 60 e 80%) de percolado de aterro sanitário e, em seguida, o restante em água de abastecimento. Concluiu-se que com o incremento do percentual de percolado aplicado houve aumento do pH e no quantitativo de Ni, Cd e Pb, assim como os teores de Ca e Cu foram reduzidos nos primeiros 0,20 m. A condutividade elétrica do extrato de saturação, e o quantitativo de Fe e Cu não variou ao longo do perfil, entretanto, verificou-se aumento na capacidade de troca catiônica (CTC) - até a dose de 60% de percolado, e do percentual de sódio trocável (PST) – embora sempre abaixo de 15%. A variação no quantitativo de Mn, Zn, Ni, Cd e Pb não ultrapassou os limites impostos pela legislação vigente. Palavras-chave: resíduo líquido, metais pesados, sustentabilidade ANDRADE FILHO, J; DIAS, N. S; BATISTA, R.O; MEDEIROS, J.F; SANTOS JUNIOR, J.A; FERREIRA, A.L.L LANDFILL PERCOLATION IN CASTOR BEAN ULTIVATION: CHEMICAL CHANGES IN RED-YELLOW ARGISOL 2 ABSTRACT The agricultural use of landfill percolation can mitigate certain environmental impacts, especially when possible chemical changes in the soil are monitored. Thus, in Mossoró, RN (5º11’31'”S, 37º20’40” W), between September 2014 and January 2015, this research was developed with the objective of quantifying changes in the chemical characteristics of a Eutrophic red-yellow agrisol cultivated with castor bean plants (Ricinus communis L.) that received landfill percolation. The experiment was conducted in a randomized block with five treatments and four replicates; percentages (0%, 20%, 40%, 60% and 80%) of percolated landfill were initially applied, followed by water supply. It was concluded that, with the increase of the percolation percentage applied, there was an increase in pH and in the quantity of Ni, Cd and Pb, while the Ca and Cu contents were reduced in the first 0.20 m. The electrical conductivity of the saturation extract, and the quantitative Fe and Cu did not vary along the profile. Nevertheless, there was an increase in CTC – up to 60% of the percolation, and exchangeable sodium percentage (ESP) – albeit always below 15%. The variation in the quantity of Mn, Zn, Ni, Cd and Pb did not exceed the limits imposed by the current legislation. Keywords: liquid waste, heavy metals, sustainability
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.