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All publications of “Marx Leandro Naves Silva”

18 results

Water Erosion in Oxisols under Coffee Cultivation

Henrique Mendes Júnior, André Silva Tavares, Walbert Reis dos Santos Júnior, Marx Leandro Naves Silva, Breno Régis Santos, Ronaldo Luiz Mincato


ABSTRACT Water erosion is one of the main environmental impacts of land use. When soil and water losses occur, nutrients essential for the growth and maintenance of plants are removed, with harmful outcomes on the sustainability of agriculture and the environment. In addition, they lead to other deleterious effects, such as sedimentation and eutrophication of water bodies. Estimation of soil losses due to water erosion in sub-basins is essential for prediction of soil degradation, especially in areas of semi-intensive cultivation, […]

Relationship Among Crop Systems, Soil Cover, and Water Erosion on a Typic Hapludox

Pedro Luiz Terra Lima, Marx Leandro Naves Silva, John Norman Quinton, Pedro Velloso Gomes Batista, Bernardo Moreira Cândido, Nilton Curi


ABSTRACT Several soil conservation practices are used to reduce water erosion and ensure sustainable agriculture. An effective crop management practice is intercropping, in which two or more crops with different architectures and vegetative cycles are grown simultaneously in the same area. We hypothesized that intercropping of corn and jack-bean increases soil cover and reduce soil erosion by water in comparison to monocropping. The objective of this study was to evaluate the effects of different crop systems on soil cover and […]

Spatial Distribution of Annual and Monthly Rainfall Erosivity in the Jaguarí River Basin

Lucas Machado Pontes, Marx Leandro Naves Silva, Diêgo Faustolo Alves Bispo, Fabio Arnaldo Pomar Avalos, Marcelo Silva de Oliveira, Humberto Ribeiro da Rocha


ABSTRACT The Jaguarí River Basin forms the main water supply sources for the São Paulo Metropolitan Region and other cities in the state. Since the kinetic energy of rainfall is the driving force of water erosion, the main cause of land and water degradation, we tested the hypothesis of correlation between the erosive potential of rainfall (erosivity) and geographical coordinates and altitude for the purpose of predicting the spatial and temporal distribution of the rainfall erosivity index (EI30) in the […]

Predicting Runoff Risks by Digital Soil Mapping

Mayesse Aparecida da Silva, Marx Leandro Naves Silva, Phillip Ray Owens, Nilton Curi, Anna Hoffmann Oliveira, Bernardo Moreira Candido


ABSTRACT Digital soil mapping (DSM) permits continuous mapping soil types and properties through raster formats considering variation within soil class, in contrast to the traditional mapping that only considers spatial variation of soils at the boundaries of delineated polygons. The objective of this study was to compare the performance of SoLIM (Soil Land Inference Model) for two sets of environmental variables on digital mapping of saturated hydraulic conductivity and solum depth (A + B horizons) and to apply the best […]

Surface Complexation Modeling in Variable Charge Soils: Charge Characterization by Potentiometric Titration

Giuliano Marchi, Cesar Crispim Vilar, George O’Connor, Marx Leandro Naves Silva


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. […]


Bernardo Moreira Cândido, Marx Leandro Naves Silva, Nilton Curi, Diego Antônio França de Freitas, Ronaldo Luiz Mincato, Mozart Martins Ferreira


Assessing the quality of agricultural soils is important for defining and adopting management practices that ensure socioeconomic and environmental sustainability. The methods for indexation of quality indicators called the Integrated Quality Index (IQI) and the Nemoro Quality Index (NQI) were used in this study to evaluate soil quality in experimental plots planted to eucalyptus. The selection of these indicators was made based on nine soil quality indicators: geometric mean diameter, water permeability, organic matter, macro- and microporosity, total porosity, bulk […]

Water erosion post-planting in eucalyptus forests in the Parana river basin, eastern Mato Grosso do Sul, Brazil

Bernardo Moreira Cândido, Marx Leandro Naves Silva, Nilton Curi, Pedro Velloso Gomes Batista


In tropical regions, the damage caused to soil by rainwater, i.e., soil erosion, is the most significant form of soil degradation. In Brazil, eucalyptus plantations are mainly located in ecosystems sensitive to anthropogenic disturbances for reasons such as the occurrence of plantations in soils with low clay contents, soils with low natural fertility, and most plantations being established on areas previously occupied by agriculture or by degraded pastures. Thus, the need arises for understanding the processes that control water erosion […]

Arbuscular mycorrhizal fungi in vegetation types in the Pantanal of Nhecolândia, Mato Grosso do Sul, Brazil

Plínio Henrique Oliveira Gomide, Marx Leandro Naves Silva, Cláudio Roberto Fonsêca Sousa Soares, Evaldo Luis Cardoso, Fernanda de Carvalho, Patrícia Lopes Leal, [...]


The Pantanal (tropical wetland) biome is recognized as one of the largest continuous areas of natural wetlands, harboring a flora and fauna of rare beauty and abundance. Studies to assess the diversity of arbuscular mycorrhizal fungi (AMF) are nonexistent for this environment. The goal of this study was to evaluate the occurrence of AMF in different vegetation types of the Pantanal of Nhecolândia, Brazil. Soil samples were collected during the dry and wet season in a Neossolo Quartzarênico (Entisol) in […]

Soil losses from typic cambisols and red latosol as related to three erosive rainfall patterns

Regimeire Freitas Aquino, Marx Leandro Naves Silva, Diego Antonio França de Freitas, Nilton Curi, Junior Cesar Avanzi


Rainfall erosivity is one of the main factors related to water erosion in the tropics. This work focused on relating soil loss from a typic dystrophic Tb Haplic Cambisol (CXbd) and a typic dystrophic Red Latosol (LVdf) to different patterns of natural erosive rainfall. The experimental plots of approximately 26 m2 (3 x 8.67 m) consisted of a CXbd area with a 0.15 m m-1 slope and a LVdf area with 0.12 m m-1 slope, both delimited by galvanized plates. […]

Hydrological consistency of digital elevation models to define drainage network in the subbasin of the Terra Dura forest stand in Eldorado do Sul, RS

Anna Hoffmann Oliveira, Marx Leandro Naves Silva, Nilton Curi, Gustavo Klinke Neto, Mayesse Aparecida da Silva, Elias Frank de Araújo


The development of water erosion occurs in response to the way water moves through and over a given landscape. The digital elevation model (DEM) must therefore be as accurate as possible, since it is the basis for the analysis of a relief. The objectives of this study were to define a hydrologically consistent digital elevation model (HCDEM) and the most appropriate method to determine the flow direction of the drainage network in the sub-basin of the Terra Dura forest stand, […]

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