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	Provedor de dados Scientia Agricola (2) Autor BACCHI,O.O.S. (2) NIELSEN,D.R. (2) REICHARDT,K. (2) DOURADO-NETO,D. (1) FRIZZONE,J. A. (1) OLIVEIRA,J.C.M. (1) TERUEL,D. A. (1) Mais... Palavra-chave Crop modeling (1) Gamma attenuation (1) Gamma radiation (1) Simulation (1) Soil water retention (1) Tipo do documento Info:eu-repo/semantics/article (2) Ano 1998 (2) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Gamma-ray beam attenuation as an auxiliary technique for the evaluation of the soil water retention curve Scientia Agricola BACCHI,O.O.S.; REICHARDT,K.; OLIVEIRA,J.C.M.; NIELSEN,D.R.. The soil water retention curve is fundamental for the hydraulic characterization of a soil and has many applications in agricultural research as well as in practical agriculture. A new procedure for soil moisture and soil bulk density evaluation inside closed pressure chambers through gamma-ray beam attenuation is presented. The proposed procedure presents several advantages in relation to the traditional process: avoids the need of continuous sample manipulation; minimizes the problem of hysteresis; allows a more precise evaluation of soil moisture by taking into account changes of soil bulk density due to swelling or shrinking on addition or removal of water; allows frequent evaluation of soil moisture without the need of opening the pressure chamber;... Tipo: Info:eu-repo/semantics/article Palavras-chave: Gamma attenuation; Gamma radiation; Soil water retention. Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000300019 Principles of crop modelling and simulation: III. modeling of root growth and other belowground processes, limitations of the models, and the future of modeling in agriculture Scientia Agricola DOURADO-NETO,D.; TERUEL,D. A.; REICHARDT,K.; NIELSEN,D.R.; FRIZZONE,J. A.; BACCHI,O.O.S.. The first models of temporal variation of root systems appeared over 20 years ago. The complex architectural geometry of root systems; the wide range in size and diameter and the rapid growth and decomposition of finest roots; the different physiological activity of roots of different ages; the complex microbial processes occurring at the root-soil interface; the symbiotic relationships in the rhizosphere; the variable soil environment (physical, chemical and biological) in which roots develop are the challenges of quantifying the root growth. The models are not simple mechanisms to archive information in order to produce forecasts. Modeling represents a better way of synthesizing knowledge about different components of a system, summarizing data, and... Tipo: Info:eu-repo/semantics/article Palavras-chave: Crop modeling; Simulation. Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500010 Registros recuperados: 2 Primeira ... 1 ... Última

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