Consulta: creatorFacets:"Vergütz,Leonardus"
Registros recuperados: 8
Data/hora: 12/06/2024 11:23:51

Agronomic biofortification of common bean grain with zinc
Provedor de dados: 86
Autores: Cambraia,Thaís Lopes Leal; Fontes,Renildes Lúcio Ferreira; Vergütz,Leonardus; Vieira,Rogério Faria; Neves,Júlio César Lima; Corrêa Netto,Pedro Silva; Dias,Raphael Felipe Nascimento.
Abstract: The objective of this work was to evaluate the effects of the split and combinated application of foliar zinc (ZnF) + soil Zn (ZnS) on Zn concentration in the grains (ZnCG) of common bean (Phaseolus vulgaris). Two experiments were carried out in a greenhouse during two seasons. In the first experiment, two common bean cultivars received six ZnF rates (0, 120, 240, 480, 720, or 1,200 g ha-1), with split applications at the R5, R7, and R8, or R7 and R8, or R8 plant stages. In the second experiment, one cultivar received three ZnS rates (0, 5, or 10 kg ha-1) combined with ZnF rates (0, 1, 1.5, 3, 6, or 10 kg ha-1). In the first experiment, with the ZnF increment, ZnCG increased linearly from 15.3 to 20.7 mg kg-1. ZnF splitting did not affect ZnCG....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Concentration of Zn in grains; Food quality; Zinc fertilization.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000102102

Functionalized Charcoal as a Buffering Matrix of Copper and Zinc Availability
Provedor de dados: 90
Autores: Guimarães,Gelton Geraldo Fernandes; Giroto,Amanda Soares; Teixeira,Breno Cardoso; Vergütz,Leonardus; Cantarutti,Reinaldo Bertola.
ABSTRACT: High copper (Cu) and zinc (Zn) contents in soil can cause phytotoxicity to plants and contaminate surface and groundwater, with negative effects on agriculture and the environment. Functionalized charcoal (OCh) has high cation exchange capacity (CEC) and the ability to adsorb Cu and Zn and control their availability in the soil and water. An adsorption study at two pH levels was carried out to evaluate increasing Cu and Zn sorption capacity provided by the functionalization process of a charcoal. In addition, a kinetics study of competitive and non-competitive adsorption-desorption of Cu and Zn in OCh was also evaluated. The results showed that functionalized charcoal (Ch) increased CEC 8.7 times due to an increase in carboxyl and phenolic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adsorption; Desorption; Metals; Remediation; Biochar.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100530

LAYERED DOUBLE HYDROXIDES: NANOMATERIALS FOR APPLICATIONS IN AGRICULTURE
Provedor de dados: 90
Autores: Benício,Luíz Paulo Figueredo; Silva,Rejane Alvarenga; Lopes,Júnia Aparecida; Eulálio,Denise; Santos,Rodrigo Morais Menezes dos; Aquino,Leonardo Angelo de; Vergütz,Leonardus; Novais,Roberto Ferreira; Costa,Liovando Marciano da; Pinto,Frederico Garcia; Tronto,Jairo.
The current research aims to introduce Layered Double Hydroxides (LDH) as nanomaterials to be used in agriculture, with particular reference to its use as storage and slow release matrix of nutrients and agrochemicals for plant growing. Structural characteristics, main properties, synthesis methods and characterization of LDH were covered in this study. Moreover, some literature data have been reported to demonstrate their potential for storage and slow release of nitrate, phosphate, agrochemicals, besides as being used as adsorbent for the wastewater treatment. This research aims to expand, in near future, the investigation field on these materials, with application in agriculture, increasing the interface between chemistry and agronomy.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Layered compounds; Nutrient slow release; Eutrophication; Nutrient reuse.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000100001

Thermodynamic Characterization of Humic Acid-surfactant Interaction: New Insights into the Characteristics and Structure of Humic Acids
Provedor de dados: 90
Autores: Vergütz,Leonardus; Silva,Luis Henrique Mendes da; Novais,Roberto Ferreira; Silva,Maria do Carmo Hespanhol da; Mageste,Aparecida Barbosa; Silva,Ivo Ribeiro.
ABSTRACT Humic acids (HA) are a component of humic substances (HS), which are found in nearly all soils, sediments, and waters. They play a key role in many, if not most, chemical and physical properties in their environment. Despite the importance of HA, their high complexity makes them a poorly understood system. Therefore, understanding the physicochemical properties and interactions of HA is crucial for determining their fundamental role and obtaining structural details. Cationic surfactants are known to interact electrostatically and hydrophobically with HA. Because they are a very well-known and characterized system, they offer a good choice as molecular probes for studying HA. The objective of this study was to evaluate the interaction between...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Enthalpy; Humic substances; Isothermal titration calorimetry; Macromolecular structure; Microcalorimetry; Supramolecular structure.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000601633

Iron Availability in Tropical Soils and Iron Uptake by Plants
Provedor de dados: 90
Autores: Mielki,Guilherme Furlan; Novais,Roberto Ferreira; Ker,João Carlos; Vergütz,Leonardus; Castro,Gustavo Franco de.
ABSTRACT Given the increase in crop yields and the expansion of agriculture in low fertility soils, deficiency of micronutrients, such as iron, in plants grown in tropical soils has been observed. The aim of this study was to evaluate Fe availability and Fe uptake by corn (Zea mays L.) plants in 13 different soils, at two depths. Iron was extracted by Mehlich-1, Mehlich-3, and CaCl2 (Fe-CC) and was fractionated in forms related to low (Feo) and high (Fed) crystallinity pedogenic oxyhydroxides, and organic matter (Fep) using ammonium oxalate, dithionite-citrate, and sodium pyrophosphate, respectively. In order to relate Fe availability to soil properties and plant growth, an experiment was carried out in a semi-hydroponic system in which part of the roots...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mehlich; Corn (Zea mays); Micronutrient; Nutrient solution; Latossolo.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100543

Lixiviação de cátions favorecida pela presença de ânions inorgânicos e ácidos orgânicos de baixa massa molecular em solos adubados com camas de aviário
Provedor de dados: 90
Autores: Gebrim,Fabrício de Oliveira; Silva,Ivo Ribeiro; Novais,Roberto Ferreira; Vergütz,Leonardus; Procópio,Lorena Costa; Nunes,Tiago Novais; Jesus,Guilherme Luiz de.
Com 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 inorgânicos acompanhantes, como cloreto, nitrato e sulfato, e do efeito complexante de ácidos orgânicos de baixa massa molecular. O objetivo deste trabalho foi estudar o efeito da aplicação de cama de aviário na lixiviação de Ca, Mg, K e Na em solos e sua associação com ânions inorgânicos e ácidos orgânicos de baixa molecular. Amostras de dois...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lixiviação de bases; Ânion acompanhante; Complexação; Acetato; Tartarato; Propianato; Oxalato; Succinato; Malato.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832008000600005

Mobility of inorganic and organic phosphorus forms under different levels of phosphate and poultry litter fertilization in soils
Provedor de dados: 90
Autores: Gebrim,Fabrício de Oliveira; Novais,Roberto Ferreira; Silva,Ivo Ribeiro da; Schulthais,Fernanda; Vergütz,Leonardus; Procópio,Lorena Costa; Moreira,Frederico Fonseca; Jesus,Guilherme Luiz de.
The eutrophication of aquifers is strongly linked to the mobility of P in soils. Although P mobility was considered irrelevant in a more distant past, more recent studies have shown that P, both in organic (Po) and inorganic forms (Pi), can be lost by leaching and eluviation through the soil profile, particularly in less weathered and/or sandier soils with low P adsorption capacity. The purpose of this study was to determine losses of P forms by leaching and eluviation from soil columns. Each column consisted of five PVC rings (diameter 5 cm, height 10 cm), filled with two soil types: a clayey Red-Yellow Latosol and a sandy loam Red-Yellow Latosol, which were exposed to water percolation. The soils were previously treated with four P rates (as KH2PO4 ) to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eutrophication; Environmental critical level; Mehlich-1; Olsen.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000400019

Biochar association with phosphate fertilizer and its influence on phosphorus use efficiency by maize
Provedor de dados: 64
Autores: Santos,Sara Ramos dos; Lustosa Filho,José Ferreira; Vergütz,Leonardus; Melo,Leônidas Carrijo Azevedo.
ABSTRACT The use of fertilizers with some degree of protection of the phosphate ions can reduce soil adsorption and increase the absorption by plants, increasing the efficiency of phosphorus (P) fertilization. This study aimed to evaluate the performance of a phosphate fertilizer associated with biochar in granules in a P-fixing soil in a greenhouse experiment. Biochars were produced from two sources of biomass: sugarcane bagasse (SB) and wood sawdust (WS), which were pyrolysed at two temperatures (350 °C and 700 °C). After chemical and physical characterization, the biochar samples were granulated with triple superphosphate (TSP) in a 3:1 ratio (TSP: biochar). The agronomic evaluation of the fertilizers was carried out by two successive maize crops (Zea...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic residues; Adsorption; Pyrolysis; Tropical soils.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542019000100202