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All publications of “Hugo Alberto Ruiz”

17 results

Soil Quality after Six Years of Paper Mill Industrial Wastewater Application

Ivan Carlos Carreiro Almeida, Raphael Bragança Alves Fernandes, Júlio César Lima Neves, Hugo Alberto Ruiz, Túlio Luís Borges de Lima, Willem Hoogmoed


ABSTRACT The application of wastewater to irrigate soils may be an attractive option for paper mills, especially when the effluents can also provide nutrients to plants. Since there could be negative environmental effects, such activity must be preceded by a thorough evaluation of the consequences. The changes in soil quality of a Neossolo Flúvico Distrófico (Typic Udifluvent) were evaluated over a period of six years of irrigation with treated effluent from a wood pulp company. Although effluent application for six […]

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


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 […]

Long-term monitoring of vegetative stabilization of a road slope of gnaisse saprolite in Minas Gerais

Rosilene Einloft, Hugo Alberto Ruiz, Liovando Marciano da Costa, Carlos Ernesto Gonçalves Reynaud Schaefer, James Jackson Griffith, Wilson Marcelo da Silva Junior, [...]


The succession of events after revegetation has rarely been studied. A plant consortium with a good initial development may come to be inadequate later, resulting in exposed soil, susceptible to the weathering forces. The objective of this study was to monitor characteristics associated with vegetative stabilization and, in the long term, the appearance of new cover forms or soil exposure in response to planting grasses and legumes on a steep road slope alongside a highway. After four years of recovery, […]

Relation of the pore-water velocity and soil column length with potassium transport parameters in an oxisol and a neosol

Danilo Pereira Ribeiro, Mauro Aparecido Martinez, Antonio Teixeira de Matos, Hugo Alberto Ruiz, Marina Souza Nicácio Parreiras, Paulo Roberto Cecon


Due to the importance of studying solute displacement in soil columns to evaluate soil and groundwater pollution risks, and the lack of standardization in the soil column length (L) and also the pore-water velocity () used, this study evaluated the relation of L and with the dispersive-diffusive coefficient (D), the dispersivity (λ) and retardation factor (R) of the potassium ion (K+) in an Oxisol and in a Dystric Quartzarenic Neosol. Five column lengths were tested (0.10, 0.20, 0.30, 0.40, and […]

Chemical dispersion in particle size analysis of latosols

Jocimar Mauri, Hugo Alberto Ruiz, Raphael Bragança Alves Fernandes, João Carlos Ker, Luiz Rogério Martins Rezende


The complete sample dispersion and maintenance of stability in the dispersed phase are fundamental for a greater accuracy in soil texture analysis. For this purpose, Na+ and Li+ compounds were tested as alternative chemical dispersants, compared to a 10 mmol L-1 NaOH solution, for the possibility of a more effective dispersion and to minimize the presence of pseudo components, basically pseudo-silt, in the particle size analysis of Oxisols. Eight samples of Oxisols from the State of Minas Gerais, selected for […]

Nutrient supply by mass flow and diffusion to maize plants in response to soil aggregate size and water potential

Ermelinda Maria Mota Oliveira, Hugo Alberto Ruiz, Víctor Hugo Alvarez V, Paulo Afonso Ferreira, Fernanda Oliveira Costa, Ivan Carlos Carreiro Almeida


Nutrients are basically transported to the roots by mass flow and diffusion. The aim of this study was to quantify the contribution of these two mechanisms to the acquisition of macronutrients (N, P, K, Ca, Mg, and S) and cationic micronutrients (Fe, Mn, Zn, and Cu) by maize plants as well as xylem exudate volume and composition in response to soil aggregate size and water availability. The experiment was conducted in a greenhouse with samples of an Oxisol, from under […]

Phloem mobility of Boron in two eucalypt clones

Edson Marcio Mattiello, Hugo Alberto Ruiz, Ivo Ribeiro da Silva, Jorge Eduardo Souza Sarkis, Júlio César Lima Neves, Murilo Marques Pucci


Boron deficiency causes large productivity losses in eucalypt stands in extensive areas of the Brazilian Cerrado region, thus understanding B mobility is a key step in selecting genetic materials that will better withstand B limitation. Thus, in this study B mobility was evaluated in two eucalypt clones (68 and 129), under B sufficiency or B deficiency, after foliar application of the 10B isotope tracer to a single mature leaf. Samples of young tissue, mature leaves and roots were collected 0, […]

Transport of boron in soil and its uptake by eucalypt

Edson Marcio Mattiello, Hugo Alberto Ruiz, Ivo Ribeiro da Silva, Nairam Félix de Barros, Julio César Lima Neves, Maurel Behling


The mechanism and magnitude of B transport to plant roots depend on both water and B soil contents. The contribution of mass flow and diffusion to the B transport in soil to eucalypt roots was evaluated in response to the water potential and B rates. Two water potentials (-10 and -40 kPa) and six B levels (0; 0.5; 1; 2; 3 and 5 mg dm-3 of B) were evaluated. The plants were grown in 2.5 dm3 plastic pots with soil, […]

Evaluation of geotextiles to control surface runoff on a roadside

Leonardo Silva Fernandes, James Jackson Griffith, Dilermando Miranda da Fonseca, Luiz Eduardo Dias, Hugo Alberto Ruiz


Considering that Brazil and many other countries with tropical ecosystems need to enhance methods of embankment cover, it is necessary to study the enhancement of available erosion control means. The study objective was to evaluate the efficiency of three commercial erosion mats: MacMat®, Fibrax® and Tela Biotêxtil® in rainfall surface erosion protection. The experiment was carried out between December 2003 and March 2004 on an embankment of a road section in Viçosa, Minas Gerais State, Brazil. Surface runoff from the […]

Distribution of ammonium, nitrate, potassium, and phosphorus in columns of fertigated latosols

Guilherme Kangussu Donagemma, Hugo Alberto Ruiz, Víctor Hugo Alvarez V., Paulo Afonso Ferreira, Reinaldo Bertola Cantarutti, Agno Tadeu da Silva, [...]


It is convenient to apply nutrients in fertigation at an appropriate depth, in order to locate those elements at a convenient place for plant uptake. So, an experiment was carried out under laboratory conditions using percolation columns, to establish the irrigation lamina fraction in which N (NH4+ e NO3–), K+, and H2PO4– doses must be applied as well as the optimum dose fractioning of these nutrients so as to locate their adequate depth and determine the distribution of fertigated NH4+, […]

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