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All publications of “Carlos Alberto Silva”

25 results

Carbon Stocks and Pools in Relation to the Texture of Kaolinitic Soils from the Brazilian East Coast

João Bosco Vasconcellos Gomes, Carlos Alberto Silva, Tamara Letícia de Azevedo Ferreira, Mozart Martins Ferreira, Alberto Vasconcellos Inda, Nilton Curi

12/Sep/2018

ABSTRACT: Extremely kaolinitic soils of Tertiary age elevations on the Brazilian east coast present a wide range of texture, which is recognized as one of the main factors controlling the soil organic matter contents. This study aimed to investigate the organic C storage of different compartments of kaolinitic soils. The studied soils had a wide particle size gradient, were under native forest vegetation, and located on Brazil’s eastern coast (Coruripe – CF, Umbaúba – UF, Nova Viçosa – VF, Sooretama […]

Is Composting a Route to Solubilize Low-Grade Phosphate Rocks and Improve MAP-Based Composts?

Henrique José Guimarães Moreira Maluf, Carlos Alberto Silva, Everton Geraldo de Morais, Leonardo Henrique Duarte de Paula

05/Feb/2018

ABSTRACT: In alkalinized and Ca-rich composts, solubilization of apatite from phosphate rocks (PRs) is not guaranteed; however, chelating agents and humified substances produced during composting may alter the soluble contents and P forms of monoammonium phosphate (MAP)-based composts. These effects may depend on the proportions of organic wastes and P source used in the compost piles. The aim of this study was to evaluate the effect of composting chicken manure, coffee husk, and Araxá PR, Bayóvar PR, or MAP in […]

Soil Fertility and Electrical Conductivity Affected by Organic Waste Rates and Nutrient Inputs

Davi Lopes do Carmo, Laís Botelho de Lima, Carlos Alberto Silva

01/Aug/2016

ABSTRACT The composition of organic waste (OW) and its effect on soil processes may change soil fertility and electrical conductivity (EC). The side effects of waste use in crop fertilization are poorly understood for Brazilian soils. This study examined the effect of the addition of 15 different organic wastes to Oxisols and a Neosol on pH, base saturation, EC, cation exchange capacity (CEC at pH 7), and the availability of Al, macro (P, K, Ca2+, Mg2+ and S) and micronutrients […]

TRACE ELEMENTS IN NATIVE VEGETATION AND INTENSIVE AGRICULTURE AREAS IN MATO GROSSO, BRAZIL, DETERMINED BY TOTAL REFLECTION X-RAY FLUORESCENCE

Maria Aparecida Pereira Pierangeli, Luiz Roberto Guimarães Guilherme, Geila Santos Carvalho, Camila de Andrade Carvalho, Carlos Alberto Silva, Luiza Maria Pereira Pierangeli

01/Jul/2015

Total Reflection X-ray Fluorescence (TXRF) is a promising technique for analysis of trace elements (TEs), mainly because samples do not need to be digested, thereby reducing generation of waste and emission of toxic fumes. This study compared the levels of the TEs:Cr, Mn, Ni, Zn, Cu, As, Se, Hg, and Pb in soil samples collected from intensive agricultural and native vegetation areas, as determined by TXRF and by flame or graphite furnace atomic absorption spectrometry (FAAS/GFAAS). In addition, we compared […]

Soluble carbon in oxisol under the effect of organic residue rates

Gabriela Lúcia Pinheiro, Carlos Alberto Silva, José Maria de Lima

01/Jun/2014

The application of organic residues to the soil can increase soluble organic carbon (SOC) and affect the pH and electrolytic conductivity (EC) of the soil. However, the magnitude of these changes depends on the type of residue and the applied dose. This study aimed to evaluate the effect of increasing C rates contained in organic residue on the pH, EC, water-extractable total carbon (WETC), water-extractable organic carbon (WEOC), and water-extractable inorganic carbon (WEIC) in soil treated with manure (chicken, swine, […]

Influence of digestion methods on the recovery of Iron, Zinc, Nickel, Chromium, Cadmium and Lead contents in 11 organic residues

Thalita Fernanda Abbruzzini, Carlos Alberto Silva, Daniela Aparecida de Andrade, Waldete Japiassú de Oliveira Carneiro

01/Feb/2014

There are currently many devices and techniques to quantify trace elements (TEs) in various matrices, but their efficacy is dependent on the digestion methods (DMs) employed in the opening of such matrices which, although “organic”, present inorganic components which are difficult to solubilize. This study was carried out to evaluate the recovery of Fe, Zn, Cr, Ni, Cd and Pb contents in samples of composts and cattle, horse, chicken, quail, and swine manures, as well as in sewage sludges and […]

Nitrogen mineralization in latosols fertilized with organic residues

Waldete Japiassu de Oliveira Carneiro, Carlos Alberto Silva, Joel Augusto Muniz, Taciana Villela Savian

01/Jun/2013

The N mineralization rate varies from one organic residue to another, and depends on the chemical composition of a residue and its interaction with the soil. This study assessed the dynamics of N mineralization of organic residues incubated in Oxisols. The experiment was carried out from July 2007 to April 2008. Samples of manures, sludges, composts, peat, and substrate were incubated in washed sand, in a Red Yellow Latosol (RYL), and in a Red Latosol (RL), with 240 and 670 […]

Podzolization in soils of depressed summit areas on the coastal plains of the brazilian Northeastern region

Elen Alvarenga Silva, João Bosco Vasconcellos Gomes, José Coelho de Araújo Filho, Carlos Alberto Silva, Samara Andrade de Carvalho, Nilton Curi

01/Feb/2013

The soils associated to depressed summits on the Coastal Plains are still little studied in Brazil and are differentiated in several aspects. Generally, the closer a soil is to these depressions, the sandier is the texture and the more accentuated the hydromorphism, where the occurrence of Spodosols is common. The objective of this work was to perform different extractions of Fe, Al, Si and organic C to understand the podzolization process in soils of the summit depressions of the Coastal […]

Carbon fractions in toposequences of soils under eucalyptus with different use history

Elen Alvarenga Silva, Carlos Alberto Silva, Ivo Ribeiro Silva, João José G. S. M. Marques, Elias Frank de Araujo, Samara Andrade de Carvalho, [...]

01/Aug/2012

In Brazil, most forest stands have been planted on soils with some degree of physical, chemical or biological degradation. The protection of the trees for the soil, depending on the litter deposition, is a driving force of the restoration process of degraded areas. Since organic matter is related to many of the physical, chemical and biological soil properties, it is characterized as a key factor for the maintenance of the environmental quality of forest systems. The purpose of this study […]

Quantification methods of carbon and organic matter in organic residues

Davi Lopes do Carmo, Carlos Alberto Silva

01/Aug/2012

In the determination of carbon contents in organic residues, analytical methods for soils are frequently employed without adequate calibration. Thus, methods capable to determine the levels of C and organic matter (OM) in organic residues must be tested and calibrated, using as a reference the dry combustion method. The objectives of this study were to evaluate methods for determining the levels of total carbon (TC), organic carbon (OC) and OM in organic residue samples; to determine mathematical equations for the […]

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