• en
  • pt-br

All publications of “Ivo Ribeiro da Silva”

26 results

Effect of Mineral Nitrogen on Transfer of 13C-Carbon from Eucalyptus Harvest Residue Components to Soil Organic Matter Fractions

Michelle de Sales Moreira Demolinari, Rodrigo Nogueira de Sousa, Ivo Ribeiro da Silva, Rafael da Silva Teixeira, Júlio César Lima Neves, Gilberto de Oliveira Mendes

21/Jul/2017

ABSTRACT The amount of harvest residues retained in Eucalyptus plantations strongly influences soil organic matter (SOM), but the efficiency of conversion to SOM may vary according to the type of residue. This study evaluated the recovery of C from Eucalyptus residue components – leaves, bark, branches, roots, and a mix of all residues – in different SOM fractions with or without mineral-N supplementation (200 mg kg-1 of N). Variation in natural 13C abundance was used to trace the destination of […]

CROP RESIDUE DECOMPOSITION AND NUTRIENT MINERALIZATION IN SOIL WITH DIFFERENT TEXTURES

Henrique José Guimarães Moreira Maluf, Emanuelle Mercês Barros Soares, Ivo Ribeiro da Silva, Júlio César Lima Neves, Lucas de Oliveira Guimarães Silva

01/Dec/2015

ABSTRACT The sustainability of conservation farming systems is closely linked to return of nutrients to the soil through decomposition of crop residues. The aim of this study was to evaluate decomposition of crop residues and nutrient mineralization in soils with different textures over a 175-day incubation period. The experimental design consisted of a 6 × 4 × 5 factorial arrangement – six treatments, composed of four crop residues (corn, brachiaria, common bean, and Stylosanthes) and two controls, both without residues, […]

NUTRIENT AVAILABILITY AND RECOVERY FROM CROP RESIDUES IN SOIL WITH DIFFERENT TEXTURES

Henrique José Guimarães Moreira Maluf, Emanuelle Mercês Barros Soares, Ivo Ribeiro da Silva, Júlio César Lima Neves, Mailson Félix de Oliveira Silva

01/Dec/2015

ABSTRACT Crop residues on the soil surface not only provide physical protection but may release significant amounts of nutrients to the soil through decomposition. However, the availability of these nutrients to plants has not been sufficiently studied. The aim of this study was to evaluate the total contents of organic C and N, pH, and the availability and recovery rate of P, K, Ca, Mg, and S from the biogeochemical cycling of different crop residues over time in built soils […]

Differential Behavior of Young Eucalyptus Clones in Response to Nitrogen Supply

Eric Victor de Oliveira Ferreira, Roberto Ferreira Novais, Greice Leal Pereira, Nairam Félix de Barros, Ivo Ribeiro da Silva

01/May/2015

Eucalyptus requires large amounts of nitrogen (N); however, it responds in diverse manners to the application of this nutrient. The aim of this study was to evaluate the differential performance in growth, mineral nutrition, and gas exchanges of N-fertilized Eucalyptus clones. The treatments consisted of two Eucalyptus clones (VM-01 and I-144) and six N application rates (0, 0.74, 2.93, 4.39, 5.85, and 8 mmol L-1 NH4NO3) arranged in a randomized complete block design with five replications. VM-01 had greater plant […]

Competitive sorption and desorption of phosphate and citrate in clayey and sandy loam soils

Matheus Fonseca de Souza, Emanuelle Mercês Barros Soares, Ivo Ribeiro da Silva, Roberto Ferreira Novais, Mailson Félix de Oliveira Silva

01/Aug/2014

The increase of organic acids in soils can reduce phosphorus sorption. The objective of the study was to evaluate the competitive sorption of P and citrate in clayey and sandy loam soils, using a stirred-flow system. Three experiments were performed with soil samples (0-20 cm layer) of clayey (RYL-cl) and sandy loam (RYL-sl) Red Yellow Latosols (Oxisols). In the first study, the treatments were arranged in a 2 × 5 factorial design, with two soil types and five combinations of […]

 Dynamics of organic matter of a sandy soil under cerrado turned into cropland converted to soybean and millet succession

Jeander Oliveira Caetano, Vinícius de Melo Benites, Gilson Pereira Silva, Ivo Ribeiro da Silva, Renato Lara de Assis, Alberto Cargnelutti Filho

01/Oct/2013

The use and management of Quartzipsamments can influence soil organic matter (SOM), but the magnitude of these variations for the specific conditions in the Cerrado (savanna-like vegetation) is still poorly studied. The aim of this work was to study the variations in SOM in a Quartzipsamment, after the conversion of native vegetation to cropland (soybean-millet rotation). Soil was sampled from 0-5, 0-10, 0-20 and 0-40 cm depths of a commercial field in Alto Garças, Mato Grosso, Brazil, of plots under […]

Organic acid adsorption and mineralization in oxisols with different textures

Felipe Vaz Andrade, Eduardo de Sá Mendonça, Ivo Ribeiro da Silva

01/Aug/2013

Organic acids play an important role in the nutritional conditions of plants. Their relevance is related to their formation dynamics, mineralization rate and adsorption by soil colloids. This study was carried out to evaluate the dynamics of mineralization and adsorption of organic acid (acetic acid – AA, citric acid – CA and humic acid – HA) applied to the soil. Samples of two Oxisols were used: Rhodic Haplustox (LV) and Typic Haplustox (LVA). The mineralization experiment was arranged in a […]

Phosphorus transformation in poultry litter and litter-treated Oxisol of Brazil assessed by 31P-NMR and wet chemical fractionation

César Roriz de Souza, Amlan Kumar Ghosh, Ivo Ribeiro da Silva, Elson Santiago de Alvarenga, Roberto Ferreira Novais, Guilherme Luiz de Jesus

01/Nov/2012

Large quantities of poultry litter are being produced in Brazil, which contain appreciable amounts of phosphorus (P) that could be of environmental concern. To assess the immediate environmental threat, five poultry litters composed of diverse bedding material were incubated for 43 days under greenhouse conditions. The litters consisted of: coffee bean husk (CH); wood chips (WC); rice husk (RH); ground corn cobs (CC) and ground napier grass (NG) (Pennisetum purpureum Schum.), in which the change in forms of soluble P […]

Urea coated with oxidized charcoal reduces ammonia volatilization

Diogo Mendes de Paiva, Reinaldo Bertola Cantarutti, Gelton Geraldo Fernandes Guimarães, Ivo Ribeiro da Silva

01/Aug/2012

Urea is the most consumed nitrogen fertilizer in the world. However, its agronomic and economic efficiency is reduced by the volatilization of NH3, which can reach 78 % of the applied nitrogen. The coating of urea granules with acidic compounds obtained by charcoal oxidation has the potential to reduce the volatilization, due to the acidic character, the high buffering capacity and CEC. This work aimed to evaluate the effect of HNO3-oxidized carbon on the control of NH3 volatilization. These compounds […]

Effect of nitrogen rates and sources on eucalyptus yield and soil organic matter fractions in the cerrado region of Minas Gerais

Guilherme Luiz de Jesus, Nairam Félix de Barros, Ivo Ribeiro da Silva, Julio César Lima Neves, Eduardo Pinheiro Henriques, Vinicius Campos Lima, [...]

01/Feb/2012

In spite of the high amount of N accumulated in high-yielding, short-rotation eucalyptus plantations, no significant or consistent increases in trunk volume have been observed in response to N fertilization. This experiment evaluated the effect of N fertilization on the growth and chemical composition of eucalyptus as well as its role in soil organic matter (SOM) mineralization. The field experiment was carried out in a randomized block design with three replications, in Itamarandiba- MG. Two N sources (ammonium sulphate and […]

1 2 3