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	Provedor de dados Rev. Bras. Ciênc. Solo (4) Bragantia (1) Autor Marinho,Mara de Andrade (5) Giarolla,Angelica (2) Medeiros,Grasiela de Oliveira Rodrigues (2) Sampaio,Gilvan (2) Silva,Laura Fernanda Simões da (2) Cooper,Miguel (1) Dourado,Thayse Aparecida (1) Lucarelli,José Ricardo Freitas (1) Marques,João Fernando (1) Matsura,Edson Eiji (1) Pugliesi,Adriane Cristine Vasconcelos (1) Ralisch,Ricardo (1) Mais... Palavra-chave GIS (2) USLE (2) Accuracy analysis (1) Conventional system (1) Crop profile method (1) Erosion (1) Geoprocessing (1) Image analysis (1) Mechanical dispersion (1) Perda de nutrientes por erosão (1) Perda de solo (1) Pipette method (1) Relação erosão-produtividade (1) Sistema plantio direto (1) Soil conservation (1) Soil erosion modeling (1) Soil loss rates (1) Soil loss tolerance (1) Soil structure (1) Soil texture (1) Mais... Tipo do documento Info:eu-repo/semantics/article (5) Ano 2016 (2) 2015 (1) 2012 (1) 2011 (1) País Brazil (5) Idioma Inglês (4) Português (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 5 Primeira ... 1 ... Última Diagnosis of the Accelerated Soil Erosion in São Paulo State (Brazil) by the Soil Lifetime Index Methodology Rev. Bras. Ciênc. Solo Medeiros,Grasiela de Oliveira Rodrigues; Giarolla,Angelica; Sampaio,Gilvan; Marinho,Mara de Andrade. ABSTRACT: The soil is a key component of the Earth System, and is currently under high pressure, due to the increasing global demands for food, energy and fiber. Moreover, the management of agricultural systems is often inadequate and ignores the agricultural suitability of lands, and particularly the vulnerability of soils. This paper demonstrates the application of the concept of the Soil Lifetime Index (SLtI) for the entire state of São Paulo, at a spatial resolution of 30 m. The SLtI methodology represents a tolerance criterion and a diagnostic tool to assess the level of soil degradation by water erosion, based on estimated soil loss rates and on an average soil renewal rate. Two approaches were applied to determine: i) the remaining time (years)... Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil erosion modeling; Soil loss rates; Soil loss tolerance; USLE; GIS. Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100552 Estimates of Annual Soil Loss Rates in the State of São Paulo, Brazil Rev. Bras. Ciênc. Solo Medeiros,Grasiela de Oliveira Rodrigues; Giarolla,Angelica; Sampaio,Gilvan; Marinho,Mara de Andrade. ABSTRACT: Soil is a natural resource that has been affected by human pressures beyond its renewal capacity. For this reason, large agricultural areas that were productive have been abandoned due to soil degradation, mainly caused by the erosion process. The objective of this study was to apply the Universal Soil Loss Equation to generate more recent estimates of soil loss rates for the state of São Paulo using a database with information from medium resolution (30 m). The results showed that many areas of the state have high (critical) levels of soil degradation due to the predominance of consolidated human activities, especially in growing sugarcane and pasture use. The average estimated rate of soil loss is 30 Mg ha-1 yr-1 and 59 % of the area of the... Tipo: Info:eu-repo/semantics/article Palavras-chave: Erosion; USLE; Soil conservation; GIS; Geoprocessing. Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100551 MORPHOLOGICAL AND MICROMORPHOLOGICAL CHANGES IN THE STRUCTURE OF A RHODIC HAPLUDOX AS A RESULT OF AGRICULTURAL MANAGEMENT Rev. Bras. Ciênc. Solo Silva,Laura Fernanda Simões da; Marinho,Mara de Andrade; Matsura,Edson Eiji; Cooper,Miguel; Ralisch,Ricardo. In evaluation of soil quality for agricultural use, soil structure is one of the most important properties, which is influenced not only by climate, biological activity, and management practices but also by mechanical and physico-chemical forces acting in the soil. The purpose of this study was to evaluate the influence of conventional agricultural management on the structure and microstructure of a Latossolo Vermelho distroférrico típico (Rhodic Hapludox) in an experimental area planted to maize. Soil morphology was described using the crop profile method by identifying the distinct structural volumes called Morphologically Homogeneous Units (MHUs). For comparison, we also described a profile in an adjacent area without agricultural use and under natural... Tipo: Info:eu-repo/semantics/article Palavras-chave: Crop profile method; Soil structure; Image analysis; Conventional system. Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000100205 Performance of a reciprocal shaker in mechanical dispersion of soil samples for particle-size analysis Rev. Bras. Ciênc. Solo Dourado,Thayse Aparecida; Silva,Laura Fernanda Simões da; Marinho,Mara de Andrade. The dispersion of the samples in soil particle-size analysis is a fundamental step, which is commonly achieved with a combination of chemical agents and mechanical agitation. The purpose of this study was to evaluate the efficiency of a low-speed reciprocal shaker for the mechanical dispersion of soil samples of different textural classes. The particle size of 61 soil samples was analyzed in four replications, using the pipette method to determine the clay fraction and sieving to determine coarse, fine and total sand fractions. The silt content was obtained by difference. To evaluate the performance, the results of the reciprocal shaker (RSh) were compared with data of the same soil samples available in reports of the Proficiency testing for Soil Analysis... Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil texture; Pipette method; Mechanical dispersion; Accuracy analysis. Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000400008 Valoração econômica do efeito da erosão em sistemas de manejo do solo empregando o método custo de reposição Bragantia Pugliesi,Adriane Cristine Vasconcelos; Marinho,Mara de Andrade; Marques,João Fernando; Lucarelli,José Ricardo Freitas. A erosão acelerada constitui importante processo de degradação da qualidade das terras agrícolas. Comumente, a perda física de solo é computada, negligenciando-se os efeitos econômicos dessas perdas, que podem ser estimados empregando-se métodos de valoração econômica. Este trabalho teve por objetivo aplicar o método Custo de Reposição, para valoração econômica das perdas de nutrientes por erosão de um Latossolo Vermelho Distroférrico típico. Foram analisados dados de perda de solo e de nutrientes provenientes de dois ensaios realizados no município de Campinas (SP). No Ensaio I (1990-1996) foram testados oito tratamentos, um por parcela, e as repetições ocorreram no tempo. No Ensaio II (2003-2005), foram testados dois tratamentos, com quatro replicações,... Tipo: Info:eu-repo/semantics/article Palavras-chave: Relação erosão-produtividade; Sistema plantio direto; Perda de solo; Perda de nutrientes por erosão. Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052011000100017 Registros recuperados: 5 Primeira ... 1 ... Última

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