13 documents found, page 1 of 2
Soluble phosphate fertilizer production using acid effluent from metallurgical ...
Mattiello, Edson M.; Resende Filho, Itamar D.P.; Barreto, Matheus S.; Soares, Aline R.; Silva, Ivo R. da; Vergütz, Leonardus; Melo, Leônidas C.A.Preventive and effective waste management requires cleaner production strategies and technologies for recycling and reuse. Metallurgical industries produce a great amount of acid effluent that must be discarded in a responsible manner, protecting the environment. The focus of this study was to examine the use of this effluent to increase reactivity of some phosphate rocks, thus enabling soluble phosphate fertil...
Adsorption and desorption kinetics and phosphorus hysteresis in highly weathere...
Vergütz, Leonardus; Melo, Leônidas Carrijo Azavedo; Guedes, Rafael Silva; Rodríguez-Vila, Alfonso; Covelo, Emma Fernández; Fernandes, Antonio RodriguesSoils with a high weathering degree present great difficulties for management of phosphorus (P) fertilization due to their high adsorption rates. The magnitude and velocity of the P retention phenomena in these soils is still poorly understood and has great importance to effective management of soil phosphorus. The objective of this study was to evaluate the adsorption and desorption kinetics and phosphorus ads...
Soil organic matter formation as affected by eucalypt litter biochemistry — Evi...
Almeida, Luís F.J.; Hurtarte, Luis C. C.; Souza, Ivan F.; Soares, Emanuelle M. B.; Vergütz, Leonardus; Silva, Ivo R.Linking plant litter biochemistry, its decomposition and soil organic matter (SOM) formation is not straightforward. In this research, we evaluated the decomposition of four biochemical fractions operationally defined as i) hot-water extractable (HWE), ii) total solvent (acetone) extractable (TSE), iii) acid-base (HNO3-KOH) unhydrolyzable cellulosic fraction (CF), and iv) acid (H2SO4) unhydrolyzable (AUR) and t...
Value of copper, zinc, and oxidized charcoal for increasing forage efficiency o...
Guimarãesv, Gelton G.F.; Mulvane, Richard L.; Cantarutti, Reinaldo B.; Teixeira, Breno C.; Vergütz, LeonardusVolatilization losses reduce the efficiency of surface-applied urea for crop N uptake, and can be controlled using urease inhibitors to retard hydrolysis or by the presence of other amendments that enhance retention of NH4+ formed by urea hydrolysis. A greenhouse study was conducted to evaluate the effectiveness of oxidized charcoal (OCh; 150 g kg−1 fertilizer) applied with or without Cu and/or Zn (∼0.5–2 g kg−...
Agronomic efficiency of phosphate fertilizers produced by the re-use of a metal...
Barreto, Matheus Sampaio Carneiro; Mattiello, Edson Marcio; Santos, Wedisson Oliveira; Melo, Leônidas Carrijo Azevedo; Vergütz, LeonardusThe production of fertilizers with industrial wastes reduces the environmental impacts of waste disposal and improves environmental sustainability by generating added-value products. Our objective with this study was to evaluate the agronomic performance and potential soil/plant contamination with heavy metals of alternative phosphate (P) fertilizers, obtained from the acidulation of phosphate rocks (PR) by a m...
Layered double hydroxides: nanomaterials for applications in agriculture
Benício, Luíz Paulo Figueredo; Silva, Rejane Alvarenga; Lopes, Júnia Aparecida; Eulálio, Denise; Santos, Rodrigo Morais Menezes dosEste trabalho de revisão tem como objetivo apresentar os Hidróxidos Duplos Lamelares (HDL) como nanomateriais para serem aplicados na agricultura, com destaque para a utilização desses como matrizes para o armazenamento e a liberação lenta de nutrientes e agroquímicos para o cultivo de plantas. São abordadas as características estruturais, as principais propriedades e os principais métodos de síntese e de carac...
Nitrogen release from urea with different coatings
Campos, Odirley R; Mattiello, Edson Marcio; Cantarutti, Reinaldo Bertola; Vergütz, LeonardusCoatings or urease inhibitors are designed to reduce losses of ammonia [NH 3(g) ] from urea fertilizers. However, nitrogen (N) release and its effects on soil solution have not previously been evaluated under standardized conditions in soils. In this study, the urea fertilizers were incubated in chambers filled with sandy loam soil, adapted for the collection of NH 3(g) and soil solution by centrifugation. In t...
Mobility of inorganic and organic phosphorus forms under different levels of ph...
Gebrim, Fabrício de Oliveira; Novais, Roberto Ferreira; Silva, Ivo Ribeiro da; Schulthais, Fernanda; Vergütz, Leonardus; Procópio, Lorena CostaA eutroficação de aquíferos está fortemente ligada à mobilidade de P nos solos. Embora essa mobilidade tenha sido considerada, num passado mais distante, como inexpressiva, estudos mais recentes têm mostrado que o P, tanto na forma orgânica (Po) quanto na inorgânica (Pi), pode se perder por percolação e eluviação de partículas através do perfil de solos, particularmente naqueles menos intemperizados e, ou, aren...
Lixiviação de cátions favorecida pela presença de ânions inorgânicos e ácidos o...
Gebrim, Fabrício de Oliveira; Silva, Ivo Ribeiro da; Novais, Roberto Ferreira; Vergütz, Leonardus; Procópio, Lorena Costa; Nunes, Tiago NovaisCom o incremento exponencial da avicultura no Brasil, a disponibilidade de dejetos de aves e de cama de aviário tem aumentado de maneira semelhante. A proibição de uso desses produtos na ração animal tem feito com que eles sejam direcionados para a produção agrícola como fertilizantes. Ainda há na literatura carência de informação sobre lixiviação de bases no perfil do solo em conseqüência do efeito de ânions i...
Thermodynamic characterization of humic acid-surfactant interaction: New insigh...
Vergütz, Leonardus; Silva, Luis Henrique Mendes da; Novais, Roberto Ferreira; Silva, Maria do Carmo Hespanhol da; Mageste, Aparecida BarbosaÁcidos húmicos (AH) são componentes principais das substâncias húmicas (SH), as quais são encontradas em praticamente todos os solos, sedimentos e corpos d’água. Elas apresentam papel fundamental na maioria, se não todas, as propriedades químicas e físicas do ambiente. Apesar de sua importância, a elevada complexidade dos AH (e das SH, em geral) fazem deles um sistema pouco compreendido. Portanto, compreender a...