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Registros recuperados: 12
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Efeito da adubação orgânica sobre as frações de carbono de solos cultivados com alfacen americana Ciência e Agrotecnologia
Marchi,Edilene Carvalho Santos; Alvarenga,Marco Antônio Rezende; Marchi,Giuliano; Silva,Carlos Alberto; Souza Filho,Jarso Luiz de.
Avaliou-se, neste estudo, o efeito da aplicação de adubos orgânicos, minerais e calagem, nas frações húmica, fúlvica e nos teores de carbono orgânico de um Latossolo Vermelho e de um Cambissolo, cultivados com alface (americana). O experimento, realizado no Departamento de Ciência do Solo da Universidade Federal de Lavras, foi constituído de cinco doses de material húmico (0, 20, 40, 100 e 200 L ha-1), três tipos de adubação (composto orgânico, esterco de aves e mineral) e calagem (com e sem uso de calcário), em cinco repetições. No Cambissolo, a calagem contribuiu para a diminuição do teor de C orgânico nas áreas adubadas com fertilizante mineral e composto, e aumentou o armazenamento de C no solo adubado com esterco de aves. Em relação à adubação...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Adubo orgânico; Ácido húmico e ácido fúlvico.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542008000600013
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Interferências no consórcio de milho com Urochloa spp. Ciência Rural
Ikeda,Fernanda Satie; Victoria Filho,Ricardo; Marchi,Giuliano; Dias,Carlos Tadeu dos Santos; Pelissari,Adelino.
Objetivou-se com este trabalho estudar a inter-relação entre a cultura de milho e cultivares de Urochloa spp. em consórcio, assim como a interferência de plantas daninhas nesses sistemas. O ensaio foi aleatorizado em três blocos em esquema de parcelas subdivididas, sendo as parcelas constituídas por sete sistemas de produção (Urochloa brizantha cv. 'Marandu' e cv. 'Piatã' e U. decumbens cv. 'Basilisk' em cultivo solteiro e em consórcio com o milho e cultivo solteiro de milho) e as subparcelas pelo controle de plantas daninhas (com e sem capina manual). Verificou-se que o estabelecimento dos consórcios de milho com as cultivares de Urochloa spp. não afeta os componentes de rendimento de produção, altura e produtividade do milho, assim como não reduz a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brachiaria brizantha; Brachiaria decumbens; Integração lavoura-pecuária.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782013001000006
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Solubility and availability of micronutrients extracted from silicate agrominerals PAB
Marchi,Giuliano; Guelfi-Silva,Douglas Ramos; Malaquias,Juaci Vitória; Guilherme,Luiz Roberto Guimarães; Spehar,Carlos Roberto; Martins,Eder de Souza.
Abstract: The objective of this work was to evaluate the solubility of the micronutrients copper, nickel, and zinc, chemically extracted from silicate agrominerals, as alternative sources of potassium for lettuce (Lactuca sativa) and rice (Oryza sativa) cultures, as well as their availability to the plants. The micronutrient contents of five agrominerals (alkaline ultramafic, biotite schist, volcanic breccia, phlogopite schist, and mining by-product from Chapada) were evaluated, after being extracted by the citric acid, hydrochloric acid, diethylenetriaminepentaacetic acid, 3051A, neutral ammonium citrate, and Mehlich-3 methods. The agrominerals, at the doses of 0 (control), 200, 400, and 600 kg ha-1 K, were mixed to soil where lettuce and rice were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Copper; Mining by-product; Nickel; Nutrient availability; Zinc.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2020000100600
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Organic acids in the rhizosphere and phytoavailability of sewage sludge-borne trace elements PAB
Pires,Adriana Marlene Moreno; Marchi,Giuliano; Mattiazzo,Maria Emília; Guilherme,Luiz Roberto Guimarães.
The aim of this work was to quantify low molecular weight organic acids in the rhizosphere of plants grown in a sewage sludge-treated media, and to assess the correlation between the release of the acids and the concentrations of trace-elements in the shoots of the plants. The species utilized in the experiment were cultivated in sand and sewage sludge-treated sand. The acetic, citric, lactic, and oxalic acids, were identified and quantified by high performance liquid chromatography in samples collected from a hydroponics system. Averages obtained from each treatment, concentration of trace elements in shoots and concentration of organic acids in the rhizosphere, were compared by Tukey test, at 5% of probability. Linear correlation analysis was applied to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biosolid; Exudates; Heavy metals; Availability.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2007000700002
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Surface Complexation Modeling in Variable Charge Soils: Prediction of Cadmium Adsorption Rev. Bras. Ciênc. Solo
Marchi,Giuliano; Vilar,Cesar Crispim; O’Connor,George; Oliveira,Letuzia Maria de; Reatto,Adriana; Rein,Thomaz Adolph.
ABSTRACT Intrinsic equilibrium constants for 22 representative Brazilian Oxisols were estimated from a cadmium adsorption experiment. Equilibrium constants were fitted to two surface complexation models: diffuse layer and constant capacitance. Intrinsic equilibrium constants were optimized by FITEQL and by hand calculation using Visual MINTEQ in sweep mode, and Excel spreadsheets. Data from both models were incorporated into Visual MINTEQ. Constants estimated by FITEQL and incorporated in Visual MINTEQ software failed to predict observed data accurately. However, FITEQL raw output data rendered good results when predicted values were directly compared with observed values, instead of incorporating the estimated constants into Visual MINTEQ. Intrinsic...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Intrinsic equilibrium constants; Oxisol; FITEQL; Visual MINTEQ; Chemical equilibrium software.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000501395
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Kinetics of K release from soils of Brazilian coffee regions: effect of organic acids Rev. Bras. Ciênc. Solo
Silva,Vladimir Antônio; Marchi,Giuliano; Guilherme,Luiz Roberto Guimarães; Lima,José Maria de; Nogueira,Francisco Dias; Guimarães,Paulo Tácito Gontijo.
Kinetic studies on soil potassium release can contribute to a better understanding of K availability to plants. This study was conducted to evaluate K release rates from the whole soil, clay, silt, and sand fractions of B-horizon samples of a basalt-derived Oxisol and a sienite-derived Ultisol, both representative soils from coffee regions of Minas Gerais State, Brazil. Potassium was extracted from each fraction after eight different shaking time periods (0-665 h) with either 0.001 mol L-1 citrate or oxalate at a 1:10 solid:solution ratio. First-order, Elovich, zero-order, and parabolic diffusion equations were used to parameterize the time dependence of K release. For the Oxisol, the first-order equation fitted best to the experimental data of K release,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Successive extractions; First order; Zero order; Parabolic diffusion; Elovich.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832008000200008
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Surface Complexation Modeling in Variable Charge Soils: Charge Characterization by Potentiometric Titration Rev. Bras. Ciênc. Solo
Marchi,Giuliano; Vilar,Cesar Crispim; O’Connor,George; Silva,Marx Leandro Naves.
ABSTRACT Intrinsic equilibrium constants of 17 representative Brazilian Oxisols were estimated from potentiometric titration measuring the adsorption of H+ and OH− on amphoteric surfaces in suspensions of varying ionic strength. Equilibrium constants were fitted to two surface complexation models: diffuse layer and constant capacitance. The former was fitted by calculating total site concentration from curve fitting estimates and pH-extrapolation of the intrinsic equilibrium constants to the PZNPC (hand calculation), considering one and two reactive sites, and by the FITEQL software. The latter was fitted only by FITEQL, with one reactive site. Soil chemical and physical properties were correlated to the intrinsic equilibrium constants. Both surface...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Intrinsic equilibrium constants; Oxisols; FITEQL; Visual MINTEQ; Chemical equilibrium software.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000501387
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Characterization and nutrient release from silicate rocks and influence on chemical changes in soil Rev. Bras. Ciênc. Solo
Silva,Douglas Ramos Guelfi; Marchi,Giuliano; Spehar,Carlos Roberto; Guilherme,Luiz Roberto Guimarães; Rein,Thomaz Adolpho; Soares,Danilo Araújo; Ávila,Fabrício William.
The expansion of Brazilian agriculture has led to a heavy dependence on imported fertilizers to ensure the supply of the growing food demand. This fact has contributed to a growing interest in alternative nutrient sources, such as ground silicate rocks. It is necessary, however, to know the potential of nutrient release and changes these materials can cause in soils. The purpose of this study was to characterize six silicate rocks and evaluate their effects on the chemical properties of treated soil, assessed by chemical extractants after greenhouse incubation. The experimental design consisted of completely randomized plots, in a 3 x 6 factorial scheme, with four replications. The factors were potassium levels (0-control: without silicate rock...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Multi-nutrient fertilizer; Nutrient available; Potassic rock; Rock powder; Soil amendment.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000300025
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EFFECT OF ALTERNATIVE MULTINUTRIENT SOURCES ON SOIL CHEMICAL PROPERTIES Rev. Bras. Ciênc. Solo
Martins,Vanessa; Silva,Douglas Ramos Guelfi; Marchi,Giuliano; Leite,Maurício Cunha Almeida; Martins,Éder de Souza; Gonçalves,Ana Stella Freire; Guilherme,Luiz Roberto Guimarães.
The current high price of potassium chloride and the dependence of Brazil on imported materials to supply the domestic demand call for studies evaluating the efficiency of alternative sources of nutrients. The aim of this work was to evaluate the effect of silicate rock powder and a manganese mining by-product, and secondary materials originated from these two materials, on soil chemical properties and on brachiaria production. This greenhouse experiment was conducted in pots with 5 kg of soil (Latossolo Vermelho-Amarelo distrófico - Oxisol). The alternative nutrient sources were: verdete, verdete treated with NH4OH, phonolite, ultramafic rock, mining waste and the proportion of 75 % of these K fertilizers and 25 % lime. Mixtures containing 25 % of lime...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil acidity; Nutrient availability; Rock powder; Multi-nutrient fertilizer.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000100194
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Plant availability of trace elements in sewage sludge-treated soils: methodology¹ Rev. Bras. Ciênc. Solo
Marchi,Giuliano; Guilherme,Luiz Roberto Guimarães; Chang,Andrew C.
Synthetic root exudates were formulated based on the organic acid composition of root exudates derived from the rhizosphere of aseptically grown corn plants, pH of the rhizosphere, and the background chemical matrices of the soil solutions. The synthetic root exudates, which mimic the chemical conditions of the rhizosphere environment where soil-borne metals are dissolved and absorbed by plants, were used to extract metals from sewage-sludge treated soils 16 successive times. The concentrations of Zn, Cd, Ni, Cr, and Cu of the sludge-treated soil were 71.74, 0.21, 15.90, 58.12, and 37.44 mg kg-1, respectively. The composition of synthetic root exudates consisted of acetic, butyric, glutaric, lactic, maleic, propionic, pyruvic, succinic, tartaric, and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Heavy metals; Soil extractant; Organic acids; Rhizosphere; Root exudates.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000400039
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Agronomic efficiency of potassium fertilization in lettuce fertilized with alternative nutrient sources Rev. Ciênc. Agron.
Guelfi-Silva,Douglas Ramos; Marchi,Giuliano; Spehar,Carlos Roberto; Guilherme,Luiz Roberto Guimarães; Faquin,Valdemar.
The aim of this study was to evaluate the effect of alternative sources of nutrients on the nutrition, yield and efficiency of potassium fertilization in lettuce. The experiment was carried out in a greenhouse, using 3.7 kg pots filled with a dystrophic red-yellow Latosol of medium texture. The experimental design was randomized, with treatments divided into a 4 x 6 factorial: four doses of potassium (0; 200; 400; 600 kg ha-1 K2O) and six alternative sources of nutrients (breccia, ultramafic, biotite schist, phlogopite, and mining and Chapada by-products), with four replications. Content and accumulation were determined for potassium (K), copper (Cu), zinc (Zn) and nickel (Ni) in the lettuce shoots, and from these data two indices were calculated for the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Lactuca sativa L; Silicate rocks; Mining by-products.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902013000200008
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Heavy metals extractability in a soil amended with sewage sludge Scientia Agricola
Marchi,Giuliano; Guilherme,Luiz Roberto Guimarães; Chang,Andrew C.; Nascimento,Clístenes Williams Araújo do.
Few investigations have been carried out about the comparison of desorption rate and amount of heavy metals extracted successively by organic acid mixtures mimicking the rhizosphere and routine extractants in sewage sludge-amended soils. Extractions of Zn, Cd, Ni, Cr, and Cu were performed in samples of a sewage sludge-amended soil using seven extractants: four organic acid mixtures and three routine extractants (DTPA, Mehlich-I, and ammonium acetate). Results from single pass extractions, in which the extractable metal contents were determined by simply extracting the soil a single time, as well as from 15 successive extractions, in which the solid residues of the first extraction was successively extracted 14 additional times, of heavy metals were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Oxisol; Extraction rate; Trace elements.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000500009
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