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	Provedor de dados Scientia Agricola (2) Rev. Bras. Ciênc. Solo (1) Autor Imhoff,Silvia Del Carmen (3) Alesso,Carlos Agustín (1) Carrizo,María Eugenia (1) Dexter,Anthony Roger (1) Masola,María Josefina (1) Pilatti,Miguel Ángel (1) Ramos,Julio César (1) Silva,Álvaro Pires da (1) Tormena,Cássio Antonio (1) Vegetti,Abelardo Carlos (1) Mais... Palavra-chave Bootstrap procedure (1) Bulk density (1) Glycine max (1) Mechanical impedance (1) No-tillage (1) Root hair (1) Root indicator (1) Sampling (1) Soil resistance (1) Soil structure (1) Soil variability (1) Soil water retention (1) Tropical soils (1) Mais... Tipo do documento Info:eu-repo/semantics/article (3) Ano 2017 (1) 2010 (1) 2008 (1) País Brazil (3) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última Estimating Sample Size of Soil Cone Index Profiles by Bootstrapping Rev. Bras. Ciênc. Solo Alesso,Carlos Agustín; Masola,María Josefina; Carrizo,María Eugenia; Imhoff,Silvia Del Carmen. ABSTRACT Measurements of the soil cone index are widely used to assess soil resistance to root penetration (SR) and to monitor the soil compaction status of agricultural fields. However, soil sampling for SR estimation is a rather challenging task in view of the high spatial and temporal variability of the soil. This study proposed a bootstrapping method to determine the minimum sample size required to estimate the vertical profile of mean soil cone index (CI) values at different levels of precision and confidence. For this purpose, CI data from a Typic Argiudoll under no-tillage before and after chiseling was used. A total of 151 CI profiles were recorded before and after chiseling in a 3,200 m2 (40 × 80 m) no-tillage area at sampling points distributed... Tipo: Info:eu-repo/semantics/article Palavras-chave: Sampling; Soil resistance; Bootstrap procedure; Soil variability. Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100429 Morphological characteristics of soybean root apexes as indicators of soil compaction Scientia Agricola Ramos,Julio César; Imhoff,Silvia Del Carmen; Pilatti,Miguel Ángel; Vegetti,Abelardo Carlos. Plant soil compaction poses a serious problem to agriculture because it produces different types of changes in plant characteristics. No method has been implemented to date to use root morphological changes as indicators of soil compaction levels. Therefore, the aim of the present study was to evaluate whether or not the morphological changes in root apexes of soybean (Glycine max (L.) Merrill) can be used as indicators of soil compaction levels. To this end, a silt-loamy soil material (from a Typic Argiudoll, Esperanza series), sieved through a 2 mm mesh was used and the following soil bulk density levels were determined: 1.1, 1.3 and 1.5 g cm³ for which the corresponding mechanical resistances were < 0.1, 0.5 and 3.5 MPa, respectively. The distance... Tipo: Info:eu-repo/semantics/article Palavras-chave: Glycine max; Mechanical impedance; Root indicator; Root hair. Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000600013 Quantification of the soil physical quality of a tropical oxisol using the S index Scientia Agricola Tormena,Cássio Antonio; Silva,Álvaro Pires da; Imhoff,Silvia Del Carmen; Dexter,Anthony Roger. Soil physical quality is fundamental for the sustainability of agro ecosystems. Soil physical quality assessment must be developed using parameters that describe physical behavior. S, a new soil physical parameter has recently been introduced for assessing the soil physical quality. A good soil physical quality has been associated with values of S > 0.035 in soils from temperate climates. However, S has not been evaluated in tropical soils yet. Therefore we tested the hypothesis that S is a reliable soil physical quality indicator of a Typic Hapludox cropped with maize under no-tillage (NT) and conventional tillage (CT). Undisturbed samples were collected from each tillage system in the row and interrow positions. Soil bulk density was determined in the... Tipo: Info:eu-repo/semantics/article Palavras-chave: Bulk density; Tropical soils; No-tillage; Soil water retention; Soil structure. Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000100008 Registros recuperados: 3 Primeira ... 1 ... Última

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