Consulta: creatorFacets:"Nielsen,D.R."
Registros recuperados: 5
Data/hora: 03/06/2024 02:54:46

A brief review of soil water, solute transport and regionalized variable analysis
Provedor de dados: 63
Autores: Nielsen,D.R.; Hopmans,J.W.; Kutílek,M.; Wendroth,O.
We initially review basic concepts of the forces acting on soil water, soil water potential and soil water retention, and equations to describe soil water movement under water-saturated and unsaturated conditions. Processes of infiltration, evaporation and redistribution of water will be presented for simple initial and boundary conditions occurring within homogeneous soil columns. Next we consider the physical, chemical and biological processes within a soil profile that distribute, dilute or concentrate solute species within the liquid phase of a soil The relative concentration of solutes in the liquid phase governs not only the retention and transport of water within soils but also contributes to our understanding of managing the quality of water within...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solute transport; Regionalized variable.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300012

Principles of crop modelling and simulation: II. the implications of the objective in model development
Provedor de dados: 63
Autores: Dourado-Neto,D.; Teruel,D.A.; Reichardt,K.; Nielsen,D.R.; Frizzone,J. A.; Bacchi,O.O.S.
With the purpose of presenting to scientists the implications of the objective in model development and a basic vision of modeling, with its potential applications and limitations in agriculture, an integration of crop modeling professionals with agricultural professionals is suggested. Models mean modernization of the information, of the measurement process and of an efficient way to learn more about complex systems. They are one of the best mechanisms of transforming information in useful knowledge and of transferring this knowledge to others. One of the problems that impede a larger progress in modeling is the lack of communication between modelers and a frequent appearance of modelers without a global vision of reality.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crop modeling; Simulation.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500009

Vadose zone measurement and modeling
Provedor de dados: 63
Autores: Hopmans,J. W.; Clausnitzer,V.; Kosugi,K.I.; Nielsen,D.R.; Somma,F.
The following treatise is a summary of some of the ongoing research activities in the soil physics program at the University of California in Davis. Each of the four listed areas win be presented at the Workshop on special topics on soil physics and crop modeling in Piracicaba at the University of Sao Paulo. We limited ourselves to a general overview of each area, but will present a more thorough discussion with examples at the Workshop.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Unsaturated zone; Water flow; Transport processes; Modeling.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300004

Selected research opportunities in soil physics
Provedor de dados: 63
Autores: Nielsen,D.R.; Kutilek,M.; Wendroth,O.; Hopmans,J.W.
Selected research opportunities are discussed in order to guide soil science research, with emphasis on soil physics, with the aim of improving agricultural productivity and environmental quality.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Research; Soil science; Soil physics.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300010

Principles of crop modeling and simulation: I. uses of mathematical models in agricultural science
Provedor de dados: 63
Autores: Dourado-Neto,D.; Teruel,D. A.; Reichardt,K.; Nielsen,D.R.; Frizzone,J. A.; Bacchi,O.O.S.
Modeling techniques applied to agriculture can be useful to define research priorities and understanding the basic interactions of the soil-plant-atmosphere system. Using a model to estimate the importance and the effect of certain parameters, a researcher can notice which factors can be most useful. The modeler should define his objectives before beginning his work and construct a model that fulfills the proposed objectives.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crop modeling; Simulation.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500008