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| Registros recuperados: 55 | |
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| Gatto,Alcides; Barros,Nairam Félix de; Novais,Roberto Ferreira; Silva,Ivo Ribeiro da; Leite,Hélio Garcia; Leite,Fernando Palha; Villani,Ecila Maria de Albuquerque. |
| O eucalipto é a principal espécie florestal plantada no Brasil. Todavia, são escassas informações acerca do C estocado no solo e na biomassa desses plantios. Este trabalho teve como objetivos avaliar o estoque de C no solo (ECS) em plantações de eucalipto e determinar quais características edafoclimáticas determinam esse estoque. O estudo foi conduzido em eucalipto cultivado na região centro-leste do Estado de Minas Gerais, abrangendo cinco regiões: Cocais (CO), Rio Doce (RD), Sabinópolis (SA), Santa Bárbara (SB) e Virginópolis (VI). Foi calculado o estoque de C no solo até 100 cm de profundidade em plantações de eucalipto em áreas com predomínio de seis classes de solo: Cambissolo Háplico (CX), Latossolo Amarelo (LA), Latossolo Vermelho (LV), Latossolo... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Características edafoclimáticas; Matéria orgânica; Equações alométricas; Solo florestal; Sequestro de carbono. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000400007 |
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| Silva,Ivo Ribeiro da; Corrêa,Tarcísio Fernando Côrtes; Novais,Roberto Ferreira; Gebrim,Fabrício de Oliveira; Nunes,Flancer Novais; Silva,Eulene Francisco da; Smyth,Thomas Jot. |
| A large proportion of soybean fields in Brazil are currently cultivated in the Cerrado region, where the area planted with this crop is growing considerably every year. Soybean cultivation in acid soils is also increasing worldwide. Since the levels of toxic aluminum (Al) in these acid soils is usually high it is important to understand how cations can reduce Al rhizotoxicity in soybean. In the present study we evaluated the ameliorative effect of nine divalent cations (Ca, Mg, Mn, Sr, Sn, Cu, Zn, Co and Ba) in solution culture on Al rhizotoxicity in soybean. The growth benefit of Ca and Mg to plants in an acid Inceptisol was also evaluated. In this experiment soil exchangeable Ca:Mg ratios were adjusted to reach 10 and 60 % base saturation, controlled by... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Heavy metals; Cation amelioration; Soil acidity; Ca:Mg ratio. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832008000500027 |
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| Villani,Ecila Mercês de Albuquerque; Barros,Nairam Félix de; Novais,Roberto Ferreira; Mendonça,Eduardo de Sá; Zocolo,Guilherme Julião. |
| Muitos trabalhos mostram a importância da biomassa microbiana do solo (BMS), principalmente como fonte/dreno de C e de N em plantações florestais; contudo, são escassos os trabalhos relacionados ao fósforo microbiano (PBM), sobretudo aqueles relativos aos métodos de determinação do PBM nesses ecossistemas. O presente trabalho foi realizado com o objetivo de avaliar métodos de determinação do PBM em solo com diferentes coberturas vegetais. O trabalho consistiu da análise de amostras de Latossolo Vermelho-Amarelo distrófico muito argiloso (LVAd) localizado no município de Viçosa (MG), coletadas nas profundidades de 0 a 5 e 5 a 10 cm, em áreas com as seguintes coberturas vegetais: pínus (Pinus taeda), eucalipto (Eucalyptus grandis) e floresta nativa. Para... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fósforo microbiano; Precisão; Solos ácidos. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000400030 |
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| Rodrigues,Fernando Antonio Vieira; Barros,Nairam Félix de; Neves,Júlio César Lima; Alvarez V.,Víctor Hugo; Novais,Roberto Ferreira. |
| No Brasil, com a intensificação da silvicultura clonal, o plantio de materiais genéticos mais produtivos e exigentes nutricionalmente tem aumentado o aparecimento de sintomas de deficiência de micronutrientes, principalmente de B e, mais recentemente, de Cu e de Zn, sobretudo em áreas de Cerrado. Este trabalho teve por objetivo avaliar três métodos de determinação da disponibilidade de Cu (Mehlich-1, Mehlich-3 e DTPA pH 7,3) para mudas de eucalipto cultivadas em casa de vegetação, em amostras de seis solos de Cerrado, e a influência de propriedades do solo na eficiência desses extratores. Os tratamentos foram arranjados no esquema fatorial 6 x 5, correspondendo a seis solos e cinco doses de Cu (0, 2, 4, 8 e 16 mg dm-3), com quatro repetições, em blocos ao... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Disponibilidade; Extratores; Cobre; Fertilização; Eucalipto. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000600017 |
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| Souza,Luiz Humberto; Novais,Roberto Ferreira; Alvarez V.,Víctor Hugo; Villani,Ecila Mercês de Albuquerque. |
| Alterações no pH da rizosfera de plantas fixadoras de N2 parecem exercer papel fundamental na absorção de micronutrientes que têm sua disponibilidade dependente de alterações da acidez do solo. Estudaram-se variações na absorção de B, Cu, Fe, Mn e Zn durante o ciclo de crescimento e desenvolvimento da soja, induzidas pela fixação biológica de N2 e pelo pH inicial de amostras de dois solos (um LV argiloso e outro arenoso), em um ensaio conduzido em casa de vegetação. Essas amostras foram incubadas com doses de CaCO3 + MgCO3 (4:1) para elevar o pH (H2O) a valores de 5,2, 5,6, 6,2 e 6,6 no solo argiloso e 5,3, 5,6, 5,9 e 6,3 no solo arenoso. Após 60 dias de incubação, essas amostras receberam 450 mg dm-3 de P e 120 mg dm-3 de K no solo. Sementes de soja... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Acidez; Fixação biológica; Micronutrientes. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000500017 |
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| 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 |
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| Faria,Geraldo Erli; Barros,Nairam Félix de; Novais,Roberto Ferreira; Silva,Ivo Ribeiro. |
| Knowledge on variations in vertical, horizontal and temporal characteristics of the soil chemical properties under eucalyptus stumps left in the soil is of fundamental importance for the management of subsequent crops. The objective of this work was to evaluate the effect of eucalyptus stumps (ES) left after cutting on the spatial variability of chemical characteristics in a dystrophic Yellow Argisol in the eastern coastal plain region of Brazil. For this purpose, ES left for 31 and 54 months were selected in two experimental areas with similar characteristics, to assess the decomposition effects of the stumps on soil chemical attributes. Soil samples were collected directly around these ES, and at distances of 30, 60, 90, 120 and 150 cm away from them, in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Nutrients; Humic substances; Spatial variability. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000300010 |
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| José,Jackson Freitas Brilhante de São; Silva,Ivo Ribeiro da; Barros,Nairam Felix de; Novais,Roberto Ferreira; Silva,Eulene Francisco; Smyth,Thomas Jot; Leite,Fernando Palha; Nunes,Flancer Novais; Gebrim,Fabrício Oliveira. |
| Understanding the magnitude of B mobility in eucalyptus may help to select clones that are more efficient for B use and to design new practices of B fertilization. This study consisted of five experiments with three eucalyptus clones (129, 57 and 58) where the response to and mobility of B were evaluated. Results indicated that clone 129 was less sensitive to B deficiency than clones 68 and 57, apparently due to its ability to translocate B previously absorbed via root systems to younger tissues when B in solution became limiting. Translocation also occurred when B was applied as boric acid only once to a single mature leaf, resulting in higher B concentration in roots, stems and younger leaves. The growth of B-deficient plants was also recovere by a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Micronutrient; Forest nutrition; Translocation; Polyol. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000600022 |
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| Leite,Fernando Palha; Novais,Roberto Ferreira; Silva,Ivo Ribeiro; Barros,Nairam Félix; Neves,Júlio César Lima; Medeiros,Alex Giovanny B.; Ventrella,Marília Contin; Villani,Ecila Mercês de Albuquerque. |
| Eucalyptus Shoot Blight in the Vale do Rio Doce (ESBVRD) is an anomaly that leads to reduced growth and, in more extreme cases, to death of eucalyptus plants. Initially diagnosed in plantations in the region of the Vale do Rio Doce, in the State of Minas Gerais, Brazil, this problem has also been found in plantations in other regions of the country and even in other countries. Although the symptoms of this anomaly are well-known, its causes are not yet understood. The aim of this study was to evaluate the cause-effect relationship between accumulation of manganese (Mn) in eucalyptus clones and ESBVRD. Characterization of the environment in areas of greater occurrence of this problem in regard to soil, climate and fluctuation of the water table was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hypoxia; Groundwater; Redox potential. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000100019 |
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| Ferreira,Eric Victor de Oliveira; Novais,Roberto Ferreira; Médice,Bruna Maximiano; Barros,Nairam Félix de; Silva,Ivo Ribeiro. |
| The use of leaf total nitrogen concentration as an indicator for nutritional diagnosis has some limitations. The objective of this study was to determine the reliability of total N concentration as an indicator of N status for eucalyptus clones, and to compare it with alternative indicators. A greenhouse experiment was carried out in a randomized complete block design in a 2 × 6 factorial arrangement with plantlets of two eucalyptus clones (140 days old) and six levels of N in the nutrient solution. In addition, a field experiment was carried out in a completely randomized design in a 2 × 2 × 2 × 3 factorial arrangement, consisting of two seasons, two regions, two young clones (approximately two years old), and three positions of crown leaf sampling. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eucalyptus; N/P ratio; Nutritional diagnosis; Plant analysis; Soil fertility evaluation; Chlorophyll meter. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000401127 |
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| 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 |
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| Rodrigues,Donizetti Tomaz; Novais,Roberto Ferreira; Alvarez V,Víctor Hugo; Dias,José Maria Moreira; Villani,Ecila Mercês de Albuquerque. |
| In the best cultivation methods of orchids, in particular of the genus Phalaenopsis, liming is a common practice. The objective of this study was to evaluate the influence of lime rates (0.0; 1.0; 2.0; 3.0; 4.0; and 5.0 g dm-3 of substrate) applied to the cultivation substrate (xaxim) on the growth of Epidendrum ibaguense seedlings. In a greenhouse, 1-L plastic pots filled with 0.8 dm³ of xaxim were irrigated such that no leachate was lost during the experiment. N, P, K, Ca, Mg, S, Fe, Zn, B, and Mn contents in roots, stems and leaves were measured. Leachate was collected by applying a sufficient water volume to obtain 25 mL from each pot. Fourteen days after lime application of 3 g dm-3, the pH of the collected leachate reached values above 7 and a value... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Orchids; Nutrition; Liming; Floriculture. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000300021 |
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| Silva,Ivo Ribeiro; Corrêa,Tarcísio Fernando Cortes; Novais,Roberto Ferreira; Smyth,T. Jot; Rufty,Thomas; Silva,Eulene Francisco; Gebrim,Fabrício Oliveira; Nunes,Flancer Novais. |
| The protective effect of cations, especially Ca and Mg, against aluminum (Al) rhizotoxicity has been extensively investigated in the last decades. The mechanisms by which the process occurs are however only beginning to be elucidated. Six experiments were carried out here to characterize the protective effect of Mg application in relation to timing, location and crop specificity: Experiment 1 - Protective effect of Mg compared to Ca; Experiment 2 - Protective effect of Mg on distinct root classes of 15 soybean genotypes; Experiment 3 - Effect of timing of Mg supply on the response of soybean cvs. to Al; Experiment 4 - Investigating whether the Mg protective effect is apoplastic or simplastic using a split-root system; Experiment 5 - Protective effect of Mg... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soybean; Cations; Calcium; Rhizotoxicity; Soil acidity. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000100007 |
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| Valadares,Samuel Vasconcelos; Neves,Júlio César Lima; Novais,Roberto Ferreira; Rosa,Gustavo Nogueira Guedes Pereira; Martinez,Hermínia Emília Prieto; Alvarez V.,Víctor Hugo. |
| Inconclusive responses of the adult coffee plant to phosphorus fertilization have been reported in the literature, especially when dealing with application of this nutrient in high density planting systems. Thus, this study was carried out for the purpose of assessing the response of adult coffee plants at high planting density in full production (in regard to yield and their biennial cycle/stability) to the addition of different sources and application rates of P in the Zona da Mata region of Minas Gerais, Brazil. The experiment with coffee plants of the Catucaí Amarelo 6/30 variety was carried out over four growing seasons. Treatments were arranged in a full factorial design [(4 × 3) + 1] consisting of four P sources (monoammonium phosphate, simple... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coffea arabica; Mineral nutrition; Biennial cycle/stability. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000300022 |
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| Registros recuperados: 55 | |
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