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	Provedor de dados Rev. Bras. Ciênc. Solo (14) Scientia Agricola (6) PAB (3) BABT (1) Ciência Rural (1) Autor Silva,Alvaro Pires da (25) Giarola,Neyde Fabíola Balarezo (10) Tormena,Cássio Antonio (8) Figueiredo,Getulio Coutinho (5) Beutler,Amauri Nelson (4) Centurion,José Frederico (4) Imhoff,Silvia (3) Leão,Tairone Paiva (3) Lima,Herdjania Veras de (3) Almeida,Brivaldo Gomes de (2) Ball,Bruce (2) Libardi,Paulo Leonel (2) Moraes,Sergio Oliveira (2) Romero,Ricardo Espíndola (2) Rosa,Jadir Aparecido (2) Tormena,Cássio Antônio (2) Ball,Bruce C. (1) Bavoso,Marina Araújo (1) Brinatti,André Maurício (1) Carvalho,Laércio Alves de (1) Mais... Palavra-chave Resistência do solo à penetração (3) Soil physical quality (3) Aeração do solo (2) Continuidade de poros (2) Densidade do solo (2) Glycine max (2) Intervalo hídrico ótimo (2) Latossolo Vermelho-Amarelo (2) Pressão de preconsolidação (2) Qualidade física do solo (2) Sistema plantio direto (2) Soil physical properties (2) Alfalfa growth (1) Atributos de solos (1) Atributos físicos (1) Bulk density (1) Caulinitas (1) Ciclos de umedecimento e secamento (1) Compactação (1) Compactação do solo (1) Mais... Tipo do documento Info:eu-repo/semantics/article (24) Info:eu-repo/semantics/report (1) Ano 2017 (1) 2015 (1) 2014 (2) 2013 (1) 2012 (2) 2011 (4) 2010 (2) 2009 (2) 2008 (1) 2006 (2) 2005 (3) 2004 (3) 2002 (1) Mais... País Brazil (25) Idioma Português (15) Inglês (10)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 25 Primeira ... 1 2 ... Última Plant response to mechanical resistance and air-filled porosity of soils under conventional and no-tillage system Scientia Agricola Silva,Alvaro Pires da; Imhoff,Silvia; Kay,Beverley. Roots may respond to restrictive soil physical conditions and send signals to shoots to control plant growth. Soil mechanical resistance and aeration can be managed to improve the soil physical conditions for plant growth by using different tillage systems. The objective of this study was to quantify the influence of no-tillage and conventional-tillage systems on plant response to soil mechanical resistance and aeration. The study was carried out on a farm, cultivated with corn, with a side-by-side comparison of no-tillage and conventional-tillage systems. Thirty-two paired sampling sites were located along two transects, located one in each treatment. Soil water content, bulk density, and plant growth were measured in each treatment. Based on the soil... Tipo: Info:eu-repo/semantics/article Palavras-chave: Plant growth; Plant height; Soil physical properties; Tillage system. Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000400016 A simplified Excel® algorithm for estimating the least limiting water range of soils Scientia Agricola Leão,Tairone Paiva; Silva,Alvaro Pires da. The least limiting water range (LLWR) of soils has been employed as a methodological approach for evaluation of soil physical quality in different agricultural systems, including forestry, grasslands and major crops. However, the absence of a simplified methodology for the quantification of LLWR has hampered the popularization of its use among researchers and soil managers. Taking this into account this work has the objective of proposing and describing a simplified algorithm developed in Excel® software for quantification of the LLWR, including the calculation of the critical bulk density, at which the LLWR becomes zero. Despite the simplicity of the procedures and numerical techniques of optimization used, the nonlinear regression produced reliable... Tipo: Info:eu-repo/semantics/article Palavras-chave: Nonlinear regression; Spreadsheet software; Optimization; Soil physics; Soil quality. Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000600013 Soil structure degradation in patches of alfalfa fields Scientia Agricola Miretti,María Celeste; Imhoff,Silvia; Silva,Alvaro Pires da; Lavado,Raúl. Alfalfa (Medicago sativa) is the basic forage resource for milk production in the flat Pampa of the Santa Fe Province of Argentina. However, the presence of microrelief with patches threatens the expansion of the area cultivated with alfalfa. The lower productivity in the patches is attributed to the inferior soil physical quality. The objectives of this study were to quantify indicators of soil physical quality and to establish the soil properties that would affect the alfalfa productivity in patches (PA) and normal areas (NA). Additionally, the macro and micro nutrient contents in both areas were determined. The experiment was carried out on an Aquic Argiudoll. Eighteen sampling sites, nine in NA and nine in PA were established. At each site, undisturbed... Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil physical properties; Soil nutrient content; Alfalfa growth. Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000500015 Soil resistance to penetration and least limiting water range for soybean yield in a haplustox from Brazil BABT Beutler,Amauri Nelson; Centurion,José Frederico; Silva,Alvaro Pires da. The objective of this study was determine the resistance to penetration (PR), least limiting water range (LLWR) and critical bulk density (Db-crit) for soybean yield in a medium-textured oxisol (Haplustox). The treatments represented the soil compaction by passing a tractor over the site 0, 1, 2, 4, and 6 times, with 4 replications in a randomized experimental design. Samples were collected from 0.02-0.05, 0.07-0.10 and 0.15-0.18 m depths. Soybean (Glycine max cv. Embrapa 48) was sowed in December 2002. Plant height, number of pods, aerial dry matter, weight of 100 seeds, and the yield in 3.6 m² plots were recorded. Soybean yield started reduction at the PR of 0.85 MPa and Db of 1.48 Mg m-3. The LLWR was limited in highest part by water content at field... Tipo: Info:eu-repo/semantics/article Palavras-chave: Glycine max; Water content; Resistance to penetration; Bulk density. Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000800002 Método de avaliação visual da qualidade da estrutura aplicado a Latossolo Vermelho Distroférrico sob diferentes sistemas de uso e manejo Ciência Rural Giarola,Neyde Fabíola Balarezo; Tormena,Cássio Antonio; Silva,Alvaro Pires da; Ball,Bruce. O aumento da demanda pela avaliação da qualidade da estrutura do solo para o adequado crescimento de plantas tem motivado pesquisadores a desenvolverem técnicas visuais de avaliação, a campo, simples e confiáveis para esse fim. No Brasil, um número reduzido de estudos foi realizado empregando métodos visuais de diagnóstico do estado estrutural de solos no campo. Esse trabalho testou a hipótese de que o método de Avaliação Visual da Qualidade da Estrutura do Solo desenvolvido por BALL et al. (2007) para solos de clima temperado pode ser aplicado na identificação de campo da qualidade estrutural de um Latossolo Vermelho Distroférrico sob diferentes sistemas de uso e manejo. Para isso, foram avaliadas amostras indeformadas coletadas de mata preservada (M),... Tipo: Info:eu-repo/semantics/article Palavras-chave: Qualidade física do solo; Morfologia do solo; Sistema plantio direto; Sistema integração lavoura-pecuária. Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782009000800041 Registros recuperados: 25 Primeira ... 1 2 ... Última

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