Slags from the iron and steel industry may be used in agriculture to correct soil acidity. Current assay assesses the effect of iron and steel industry´s slag, derived from stainless steel, and compares it to limestone as soil acidity corrective and silicon source in coffee plants. The experiment was conducted between December, 2012 and January, 2014 in the municipality of Machado MG Brazil, in a 4-year-old coffee plantation, cultivar Catuaí Amarelo IAC 30. Experimental design comprised randomized blocks in a 2x4 factorial scheme, with control and four replications. Treatments combined two soil acidity correctives, namely, stainless steel slag ("Agrosilício") and limestone; 4 corrective doses corresponding to 0.5; 1; 1.5; 2 times the amount required to raise index base saturation (V%) of the soil´s surface layer (0 to 0.2m) by 60%. Control did not contain any soil correction. Soil samples were collected during the experiment at depths 0 to 0.1m; 0.1 to 0.2m; 0.2 to 0.4m; similarly, samples of coffee leaves, at 180 and 390 days, respectively, after the application of correctives. Stainless steel slag showed the same efficiency as limestone in soil acidity correction at 0 to 0.1m layer, and in providing Ca 2+ to the coffee plant. Stainless steel slag does not correct soil acidity at 0.1 to 0.2 and 0.2 to 0.4 m layers in coffee plants within a 180 day period. Stainless steel slag increases silicon rates in the soil and in the coffee leaves, and increases yield when compared to limestone.
Resumo: A inserção da educação ambiental no recinto escolar tem grande relevância nas mobilizações efetivas para o desenvolvimento sustentável. Dessa forma, objetivou-se desenvolver estratégias de sensibilização para disseminação dos princípios da educação ambiental junto a discentes do ensino médio de uma escola estadual situada em Pombal, Paraíba. Os procedimentos metodológicos pautaram-se em três etapas: a observação não participante; a realização de rodas de conversas com elementos estruturados visando à quantificação; e a inserção de atividades de reutilização de resíduos sólidos, objetivando iniciar um processo de sensibilização dos estudantes a partir da prática. Os resultados da análise revelaram que a Educação Ambiental no ambiente escolar se dá de maneira sucinta, contribuindo com uma lacuna que dificulta a compreensão de integração entre a natureza e a sociedade, ressaltando apenas a ideia de que as questões ambientais resumem-se apenas às noções do conservadorismo e da natureza como algo intocável, desenraizando a responsabilidade de cada indivíduo na construção de uma identidade planetária.Palavras-chave: Cidadania planetária; Estratégias; Relação sociedade-natureza. Abstract:The insertion of environmental education in the school district has great relevance in effective mobilizations for sustainable development. In this way, the objective of this work was to develop awareness-raising strategies to disseminate the principles of environmental education among high school students of a public school located in the city of Pombal Paraíba. The methodological procedures were based on three stages: non-participant observation; the realization of conversational groups with structured elements aimed at quantification; and the insertion of solid waste reuse activities, aiming to initiate a process of sensitizing students from the practice. The results of the analysis revealed that Environmental Education in the school environment is succinct, contributing to a gap that makes it difficult to understand the integration between nature and society, emphasizing only the idea that environmental issues are limited to the notions conservatism and nature as something untouchable, uprooting the responsibility of each individual in the construction of a planetary identity.
Modo de acesso: World Wide Web Inclui bibliografia 1. Agricultura 2. Ecologia.3. Tecnologia I. Título CDD-333.7369 O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos seus respectivos autores.
A degradação dos solos constitui um dos principais problemas da atualidade, sendo decorrente, na maioria das vezes das ações irresponsáveis do ser antrópico sobre os recursos naturais, nesse cenário, o geoprocessamento se apresenta como uma importante ferramenta de investigação, servindo de base para identificação dos níveis de degradação ambiental, bem como na classificação de terras e na elaboração de mapas cartográficos que auxiliem no planejamento público, e em novas pesquisas acadêmicas. Neste estudo, teve-se por objetivo avaliar a susceptibilidade à erosão hídrica na Bacia Hidrográfica do Rio Piancó, por meio de geotecnologias. Em síntese, a sequência dos procedimentos metodológicos utilizados nesta pesquisa foram: levantamento bibliográfico, criação de um banco de dados georreferenciados, atribuição de pesos as classes de susceptibilidade à erosão do solo, elaboração de mapas temáticos e geração de um mapa final de vulnerabilidade à erosão hídrica. A partir dos resultados, foi possível identificar áreas de incompatibilidade legal e averiguar que 66% da área de estudo apresentou grau de vulnerabilidade medianamente estável/vulnerável e que outros 19% da área enquadraram-se de moderadamente vulnerável a vulnerável, indicando assim, a necessidade da adoção de medidas mitigadoras a fim de reduzir a vulnerabilidade dos solos nesses locais. Por fim, pôde-se concluir, que o uso de geotecnologias associado a modelos empíricos é eficaz na classificação de vulnerabilidade à erosão hídrica. Analysis of Susceptibility to Water Erosion in a Hydrographic Basin on the Brazilian SemiaridA B S T R A C T Soil degradation is one of the main problems nowadays, being the result, in most cases, of the irresponsible actions of anthropic being on natural resources, in this context, geoprocessing presents itself as an important research tool, serving as a basis for identifying levels of environmental degradation, as well as in the classification of lands and in the elaboration of cartographic maps that assist in public planning and in new academic research. In this study, the objective was to evaluate the susceptibility to water erosion in the Piancó River Hydrographic Basin, through geotechnologies. The sequence of the methodological procedures used in this research were: creation of a georeferenced database, assigning weights to classes of susceptibility to soil erosion, thematic maps elaboration and generation of a final map of vulnerability to water erosion. From the results, it was possible to identify areas of legal incompatibility and ascertain that 66% of the study area had a moderately stable / vulnerable degree of vulnerability and that another 19% of the area classified themselves as moderately vulnerable to vulnerable, thus indicating the need the adoption of mitigation measures in order to reduce the vulnerability of soils in these places. Finally, it was concluded that the use of geotechnologies associated with empirical models is effective in classifying soil vulnerability to water erosion.Keywords: Environmental vulnerability. Geoprocessing. GIS. Environmental planning.
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