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	Provedor de dados 63 (29) 90 (7) 86 (4) 42 (3) 91 (3) 43 (2) 36 (1) 53 (1) Mais... Autor Reichardt,Klaus (50) Bacchi,Osny Oliveira Santos (16) Dourado-Neto,Durval (11) Timm,Luís Carlos (10) Timm,Luis Carlos (6) Bacchi,Osny O.S. (3) Barbosa,Emanuel Pimentel (3) Dourado Neto,Durval (3) Hopmans,Jan W. (3) Nielsen,Donald R. (3) Oliveira,Julio Cesar Martins de (3) Pauletto,Eloy Antonio (3) Pires,Luiz F. (3) Shao,Ming An (3) Silva,Adriana Lúcia da (3) Bacchi,Osny O. S. (2) Bruno,Isabeli Pereira (2) Correchel,Vladia (2) Cássaro,Fabio Augusto Meira (2) Cássaro,Fábio Augusto Meira (2) Mais... Palavra-chave Soil water content (4) Soil water storage (3) Evapotranspiration (2) Fósforo (2) Glycine max (2) Internal drainage (2) Modelagem (2) Nitrogen (2) Soil management (2) Soil movement (2) Soil physical properties (2) Soil properties (2) Soil structure (2) Spatial variability (2) Stable isotope (2) Water balance (2) 15N (1) 15N tracer studies (1) Actual and reference evapotranspiration (1) Aeration capacity (1) Mais... Tipo do documento Info:eu-repo/semantics/article (39) Info:eu-repo/semantics/other (5) Info:eu-repo/semantics/report (5) Ano 2016 (1) 2015 (1) 2014 (2) 2013 (1) 2011 (3) 2010 (3) 2009 (4) 2008 (5) 2007 (3) 2006 (4) 2005 (1) 2003 (1) 2002 (1) 2001 (2) 2000 (6) 1999 (4) 1997 (1) 1995 (1) 1994 (1) 1993 (1) Mais... País Brazil (50) Idioma Inglês (33) Português (16) Espanhol (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 50 Primeira ... 1 2 3 ... Última Spatial variability of soil hydraulic properties on a steep slope in the loess plateau of China 63 Hu,Wei; Shao,Ming An; Wang,Quan Jiu; Fan,Jun; Reichardt,Klaus. The understanding of the structure of the spatial variability of soil surface hydraulic properties on steep slopes is important for modeling infiltration and runoff processes. The objective of this study was to investigate the spatial variability of these properties on a steep slope of the Loess Plateau in northwest China. A 9600 m² area was systematically sampled in a grid of 106 points spaced 10 m x 10 m. Hydraulic properties were determined with a disc infiltrometer under multiple pressure heads (-15, -9, -6, -3, 0 cm) at each sample point. Classical and geo-statistical methods were used for data analysis. The results indicated that the variation of Gardner's a and hydraulic conductivities at all applied pressure heads was moderate and the heterogeneity... Tipo: Info:eu-repo/semantics/article Palavras-chave: Disc infiltrometer; Steep sloping land; Pressure head; Spatial structure. Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000300007 Editorial 63 Sentelhas,Paulo Cesar; Reichardt,Klaus; Alleoni,Luís Reynaldo Ferraciú. Tipo: Info:eu-repo/semantics/other Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700001 Energy flow in castor bean (Ricinus communis L.) production systems 63 Silva,Adilson Nunes da; Romanelli,Thiago Libório; Reichardt,Klaus. Although energy analysis is a way to evaluate the sustainability of production systems, this practice is not often used in the agribusiness. In this context, the castor bean (Ricinus communis L) is an agricultural crop not yet well studied despite its great potential in the Brazilian energetic scenario. This article aimed to evaluate the productive potential of the castor bean oil, using an energetic view applied to two management systems: low (System 1) and medium (System 2) technologies. The quantification of the used material fluxes was made converting these factors in energy units. The input energy fluxes were 3,170.6 MJ ha¹ and 10,366.0 MJ ha¹ for Systems 1 and 2, respectively. The energy balance of System 1 was 11,938.2 MJ ha¹ and that of System 2... Tipo: Info:eu-repo/semantics/article Palavras-chave: Energetic balance; Oil crops; Production technology; Cultivation systems. Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000600018 Aspectos hídricos de alguns solos da Amazônia - Região do baixo rio Negro 36 Reichardt,Klaus; Ranzani,Guido; Freitas Jr,Elias de; Libardi,Paulo Leonel. Resumo No presente trabalho, é feito um confronto entre os dados climatológicos, a água disponível e a condutividade hidráulica saturada de nove perfis de solos da região do baixo rio Negro, no Estado do Amazonas. Os resultados tendem sugerir a presença de uma relativamente baixa capacidade de armazenamento de água disponível nos perfis de solo estudados. Em média a condutividade hidráulica saturada é representada por 35 mm/hora, concluindo-se que chuvas com intensidade igual ou maior do que 35 mm/hora praticamente se constituirão em deflúvio que se perde por escoamento superficial. Ano: 1980 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59671980000100043 Chemical migration during soil water retention curve evaluation 42 Pires,Luiz F.; Villanueva,Felipe C.A.; Dias,Nivea M.P.; Bacchi,Osny O. Santos; Reichardt,Klaus. Wetting and drying (W-D) cycles can induce important elemental migrations in soils. The main purpose of this work was to study the possible existence of soil chemical elemental migrations in samples submitted to repeated W-D cycles during evaluations of soil water retention curve (SWRC). The experimental measurements were carried out by Atomic Absorption Spectrometry (AAS) for Ca2+, Mg2+ and K+ on samples of three different Brazilian tropical soils (Geric Ferralsol, Eutric Nitosol and Rhodic Ferralsol). Results demonstrate an increase in the electrical conductivity of the water extracted from the samples and significant losses of Ca2+, Mg2+ and K+ during the applications of up to nine W-D cycles. It was also observed differences in SWRC for all soils when... Tipo: Info:eu-repo/semantics/article Palavras-chave: Analytical methods; Soil structure; Wetting-drying cycles; Soil physics. Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300028 Riparian forest potential to retain sediment and carbon evaluated by the 137Cs fallout and carbon isotopic ratio techniques 42 Pires,Luiz F.; Bacchi,Osny O.S.; Correchel,Vladia; Reichardt,Klaus; Filippe,Joseline. Riparian forests can provide an important service for aquatic ecosystems by sequestering hillslopederived sediments. However, the width of a riparian buffer zone required to filter sediments is not yet wellunderstood. Here are used two complementary tracers to measure sediment retention. The 137Cs technique and the soil carbon isotopic ratios (δ13C) are utilized to investigate sediment deposition and erosion rates on a slope transect cultivated with sugarcane followed by a secondary riparian forest zone in Iracemápolis, State of São Paulo, Brazil. The 137Cs technique and the δ13C analysis showed that the width of a riparian vegetation in accordance to a Brazilian Environmental Law (Nº4.771/65) was not sufficient in trapping sediments coming from... Tipo: Info:eu-repo/semantics/article Palavras-chave: Erosion; Δ13C; Sugarcane; C3 and C4 plants; Carbon. Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000200013 Pore system changes of damaged Brazilian oxisols and nitosols induced by wet-dry cycles as seen in 2-D micromorphologic image analysis 42 Pires,Luiz F.; Reichardt,Klaus; Cooper,Miguel; Cássaro,Fabio A.M.; Dias,Nivea M.P.; Bacchi,Osny O.S.. Soil pore structure characterization using 2-D image analysis constitutes a simple method to obtain essential information related to soil porosity and pore size distribution (PSD). Such information is important to infer on soil quality, which is related to soil structure and transport processes inside the soil. Most of the time soils are submitted to wetting and drying cycles (W-D), which can cause important changes in soils with damaged structures. This report uses 2-D image analysis to evaluate possible modifications induced by W-D cycles on the structure of damaged soil samples. Samples of three tropical soils (Geric Ferralsol, GF; Eutric Nitosol, EN; and Rhodic Ferralsol, RF) were submitted to three treatments: 0WD, the control treatment in which... Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil bulk density; Soil water content; Soil porosity; Micromorphology; Soil structure; Compaction. Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000100016 Uso da radiação gama na determinação da densidade aparente e da umidade do solo 43 Reichardt,Klaus. Tipo: Info:eu-repo/semantics/article Ano: 1965 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761965000100017 Nota do editor 43 Reichardt,Klaus. Tipo: Info:eu-repo/semantics/other Ano: 1991 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0071-12761991000100001 Estimativa de fluxos de água em solos não saturados 53 Reichardt,Klaus; Bacchi,Osny Oliveira Santos; Villagra,Maria Mercedes. Com dados obtidos em perfis de terra roxa estruturada do município de Piracicaba (SP), é mostrada a dificuldade da estimativa de fluxos de água no solo, utilizando o modelo de Darcy-Buckingham. O experimento trata do estabelecimento de balanços hídricos em 25 parcelas de 5 x 5 m, alinhadas ao longo de uma transeção de 125 m. O componente drenagem profunda do balanço hídrico é estimado mediante medidas de umidade do solo (teta, cm³/cm³), feitas com sonda de nêutrons, e de potencial total da água do solo H (cm H2O) obtidas com tensiômetros. O trabalho mostra a grande dificuldade da estimativa de fluxos de drenagem q (mm/dia), a qual está relacionada: (1) à exponencialidade da relação entre a condutividade hidráulica do solo k (mm/dia) e a umidade do solo ou... Tipo: Info:eu-repo/semantics/article Palavras-chave: Condutividade hidráulica do solo; Equação de Darcy. Ano: 1993 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051993000100010 Registros recuperados: 50 Primeira ... 1 2 3 ... Última

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