Consulta: creatorFacets:"Pinheiro,Everton Alves Rodrigues"
Registros recuperados: 4
Data/hora: 10/06/2024 18:16:02

Hydrostatic Equilibrium between Soil Samples and Pressure Plates Used in Soil Water Retention Determination: Consequences of a Questionable Assumption
Provedor de dados: 90
Autores: van Lier,Quirijn de Jong; Pinheiro,Everton Alves Rodrigues; Inforsato,Leonardo.
ABSTRACT Soil water retention is among the soil hydraulic properties most routinely measured in studies of soil physics and related areas. This property is used in dynamic simulations of vadose zone processes such as soil water availability, surface boundary processes of evaporation and infiltration, and the fate of soil pollutants. The most common measurement technique consists in establishing a hydrostatic equilibrium between an initially saturated soil sample and a porous medium at a certain tension on a tension table or pressure plate. However, there is reasonable doubt about the assumed hydrostatic equilibrium, especially in the dry range at low pressure heads. In this study we compared the traditional pressure plate apparatus protocol to an inverse...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Inverse parameter optimization; Soil available water; Wilting point.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832019000100408

An Alert Regarding a Common Misinterpretation of the Van Genuchten α Parameter
Provedor de dados: 90
Autores: van Lier,Quirijn de Jong; Pinheiro,Everton Alves Rodrigues.
ABSTRACT Among the equations available to describe the relation between matric potential and soil water content, the soil water retention function, the most commonly used is the equation proposed by Van Genuchten in his 1980 landmark paper. In soil physics literature, especially in Brazil, several authors relate the inverse of the Van Genuchten parameter α to the air-entry pressure. This study aimed to show this common interpretation to be erroneous, as 1/α corresponds to water contents lower than saturation. The deviation depends on the m parameter. In fact, α is merely a scaling parameter relative to the matric potential axis. Recognizing this mathematical fact may improve the interpretation of soil hydraulic properties based on water retention parameters.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil water retention; Soil physics; Empirical equations.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100415

Spatial behaviour of soil moisture in the root zone of the Caatinga biome
Provedor de dados: 124
Autores: Costa,Carlos Alexandre Gomes; Lopes,José Wellington Batista; Pinheiro,Everton Alves Rodrigues; Araújo,José Carlos de; Gomes Filho,Raimundo Rodrigues.
The purpose of this study was to represent the soil moisture in the profile corresponding to the root zone from TDR sensors in a preserved area of the Caatinga biome and analyze the spatialized moisture adjustment equations under different layers of the soil profile. For that, we analyzed three classes of soil (red yellow Ultisol; Hypochromic Luvisol; Udorthent) in the Aiuaba Experimental Watershed, located in the semiarid zone of northeastern Brazil. The hydro-physical parameters representing the soil water retention (field capacity, wilting point and residual moisture) were collected in four campaigns, in six points and in the profiles corresponding to the effective root depth, totaling 216 samples. For the evaluation of the regression models, we used...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caatinga; Soil; Time domain reflectometry.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902013000400004

Desempenho agronômico e divergência genética de genótipos de coentro
Provedor de dados: 124
Autores: Bertini,Cândida Hermínia de Magalhães; Pinheiro,Everton Alves Rodrigues; Nóbrega,Gabriel Nuto; Duarte,José Moacir de Lima.
Cinco genótipos de Coriandrum sativum, procedentes de diferentes regiões do Estado do Ceará e duas cultivares comerciais, foram avaliados objetivando-se identificar genótipos com potencial agronômico para serem utilizados em programa de melhoramento genético por meio de análise de desempenho e divergência genética. O trabalho foi conduzido no período de setembro a dezembro de 2007 no município de Fortaleza-CE. O delineamento utilizado foi o aleatorizado em blocos com três repetições, onde os genótipos e cultivares foram considerados tratamentos. Na análise de desempenho verificou-se diferença entre as médias dos genótipos avaliados para as características: altura da planta, diâmetro do colo, surgimento da primeira inflorescência, antese, média de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coriandrum sativum; Fenologia vegetal; Melhoramento genético; Diversidade genética.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902010000300013