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All publications of “Víctor Hugo Alvarez V”

29 results

Modeling in the Adjustment of Fertilization Recommendation through Leaf Analysis in Fertigated ‘Prata’ Banana

José Aridiano Lima de Deus, Júlio César Lima Neves, Ismail Soares, Víctor Hugo Alvarez V., Fabricio Martinazzo Regis de Albuquerque, Lauana Lopes dos Santos, [...]

26/Nov/2018

ABSTRACT: In banana cultivation, fertilization recommendations are almost exclusively based on soil chemical analysis, without considering leaf analysis and expected yield, which can help in the adjustment of fertilization programs. The aim of this study was to develop a method to recommend macronutrient fertilization rates which integrates data on leaf analysis, soil chemical analysis, and yield. Yield, soil chemical analysis, and leaf analysis data of fertigated plantations of ‘Prata’ banana were obtained for the first and second halves of the […]

Phosphorus-Zinc Interaction and Iron and Manganese Uptake in the Growth and Nutrition of Phalaenopsis (Orchidaceae)

Sarah Vieira Novais, Roberto Ferreira Novais, Víctor Hugo Alvarez V., Ecila Mercês de Albuquerque Villani, Mariana Delgado Oliveira Zenero

09/Dec/2016

ABSTRACT: Visual symptoms of Zn deficiency, induced by excessive P applications, have been observed in commercial orchid nurseries. The supply of other metallic micronutrients, such as Fe and Mn, may also be inadequate in the plant due to high application rates of P. The aim of this study was to investigate this interaction in the nutrition of Phalaenopsis plants. Experimental treatments consisted of three P rates (0.0, 0.5, and 1.0 g L-1) and three Zn rates (0.00, 0.35, and 0.70 […]

Quantification of permanent and variable charges in reference soils of the State of Pernambuco, Brazil

Jailson Cavalcante Cunha, Hugo Alberto Ruiz, Maria Betânia Galvão dos Santos Freire, Víctor Hugo Alvarez V., Raphael Bragança Alves Fernandes

01/Aug/2014

The electrical charges in soil particles are divided into structural or permanent charges and variable charges. Permanent charges develop on the soil particle surface by isomorphic substitution. Variable charges arise from dissociation and association of protons (H+), protonation or deprotonation, and specific adsorption of cations and anions. The aim of this study was to quantify the permanent charges and variable charges of Reference Soils of the State of Pernambuco, Brazil. To do so, 24 subsurface profiles from different regions (nine […]

Yield gains of coffee plants from phosphorus fertilization may not be generalized for high density planting

Samuel Vasconcelos Valadares, Júlio César Lima Neves, Roberto Ferreira Novais, Gustavo Nogueira Guedes Pereira Rosa, Hermínia Emília Prieto Martinez, Víctor Hugo Alvarez V.

01/Jun/2014

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 […]

Rose production affected by silicon rates applied to substrate

Luiz Antônio Zanão Júnior, Victor Hugo Alvarez V., Maristela Pereira Carvalho-Zanão, Renildes Lúcio Ferreira Fontes, José Antônio Saraiva Grossi

01/Dec/2013

The use of Si in the cultivation of pot-grown ornamental species in greenhouse has increased the output and quality of the final product. The objective of this study was to evaluate yield and nutrient uptake of two rose cultivars grown in pots under Si application to the substrate. The treatments, arranged in a 2 x 5 factorial design, consisted of two rose cultivars (Yellow Terrazza® and Red White Terrazza®) and five Si doses (0.0; 0.25; 0.50; 0.75 e 1.00 g […]

Zinc availabity for eucalypt seedlings in Cerrado soils

Fernando Antonio Vieira Rodrigues, Nairam Félix de Barros, Júlio César Lima Neves, Víctor Hugo Alvarez V, Roberto Ferreira Novais

01/Aug/2012

In Brazil, along with the expansion of clonal forestry, the management of more productive and more nutrient-demanding genotypes has led to the appearance of micronutrient deficiency symptoms, mainly of boron (B), and more recently, of copper (Cu) and of zinc (Zn), especially in Cerrado areas. The purpose of this study was to evaluate three extraction solutions to determine Zn availability (Mehlich-1, Mehlich-3 and DTPA pH 7.3) for eucalyptus seedlings grown in a greenhouse, on six Cerrado soil samples, and to […]

Copper availabity for eucalyptus seedlings in cerrado soils

Fernando Antonio Vieira Rodrigues, Nairam Félix de Barros, Júlio César Lima Neves, Víctor Hugo Alvarez V., Roberto Ferreira Novais

01/Dec/2010

In Brazil, along with the intensification of clonal forestry, the management of more productive and more nutrient-demanding genotypes has led to the appearance of micronutrient deficiency symptoms, mainly of Boron, and more recently, of Copper (Cu) and Zinc, especially in Cerrado areas. The purpose of this study was to evaluate three extractant solutions to determine Cu availability (Mehlich-1, Mehlich-3 and DTPA pH 7.3) for eucalyptus seedlings grown under greenhouse conditions in six Cerrado soil samples and to assess the influence of […]

Orchid growth and nutrition in response to mineral and organic fertilizers

Donizetti Tomaz Rodrigues, Roberto Ferreira Novais, Víctor Hugo Alvarez V., José Maria Moreira Dias, Ecila Mercês de Albuquerque Villani

01/Oct/2010

Orchid fertilization is fundamental for a satisfactory plant growth and development for commercial orchid production as well as in collections. Mineral and/or organic sources can be used for fertilization. The objective of this study was to evaluate the effect of the use of organic and/or mineral fertilizers on the nutrition and growth of orchid (Laelia purpurata ‘werkhanserii’ x L. lobata ‘Jeni’) seedlings in greenhouse. The following fertilizers were tested: an NPK fertilizer + micronutrients; a Ca source in the form […]

Effect of pH of rhizospheric and non-rhizospheric soil on boron, copper, iron, manganese, and zinc uptake by soybean plants inoculated with Bradyrhizobium japonicum

Luiz Humberto Souza, Roberto Ferreira Novais, Víctor Hugo Alvarez V., Ecila Mercês de Albuquerque Villani

01/Oct/2010

Changes in the pH of the rhizosphere of N2-fixing plants seem to play a key role in the uptake of micronutrient whose availability depends on changes in soil acidity. Variations in the B, Cu, Fe, Mn, and Zn uptake were studied during soybean development and growth cycle under the influence of biological N2 fixation and the initial pH of two soils samples (a clayey and a sandy Yellow Latosol; Oxisols), in a greenhouse experiment. These samples were incubated with rates […]

Brazilian soil science: from its inception to the future, and beyond

Flavio A. de Oliveira Camargo, Víctor Hugo Alvarez V., Philippe C. Baveye

01/Jun/2010

The present essay is meant to provide some background on the evolution of the soil science community in Brazil, since its inception, to describe its current situation, and to outline a number of opportunities and challenges facing the discipline in decades to come. The origin of Brazilian agronomy dates back to the beginning of the 19th century as a subdiscipline of botany, and its association with chemistry would later establish it as a science. In the middle of the 19th […]

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