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A software to calculate soil hydraulic conductivity in internal drainage experiments (SHC, Version 2.00) Rev. Bras. Ciênc. Solo
Dourado Neto,Durval; Reichardt,Klaus; Silva,Adriana Lúcia da; Bacchi,Osny Oliveira Santos; Timm,Luis Carlos; Oliveira,Júlio César Martins; Nielsen,Donald R..
A software for the calculation of unsaturated soil hydraulic conductivity K(theta) is presented for commonly used methods found in the literature, based on field experiments in which a soil profile is submitted to water infiltration followed by internal drainage. The software is available at: dourado@esalq.usp.br.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Internal drainage; Soil water content; Water infiltration.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832007000500037
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Assessment of soil loss vulnerability in data-scarce watersheds in southern Brazil Ciência e Agrotecnologia
Steinmetz,Alice Alonzo; Cassalho,Felício; Caldeira,Tamara Leitzke; Oliveira,Vinícius Augusto de; Beskow,Samuel; Timm,Luis Carlos.
ABSTRACT Soil erosion is currently one of the main concerns in agriculture, water resources, soil management and natural hazards studies, mainly due to its economic, environmental and human impacts. This concern is accentuated in developing countries where the hydrological monitoring and proper soil surveys are scarce. Therefore, the use of indirect estimates of soil loss by means of empirical equations stands out. In this context, the present study proposed the assessment of the Revised Universal Soil Loss Equation (RUSLE) with the aid of Geographical Information Systems (GIS) and remote sensing for two agricultural watersheds in southern Rio Grande do Sul - Brazil. Among all RUSLE factors, LS showed the closest patterns to the local when compared to the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil erosion; Revised universal soil loss equation; Geographical information systems; Remote sensing.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542018000600575
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Fertilizer 15N balance in a coffee cropping system: a case study in Brazil Rev. Bras. Ciênc. Solo
Fenilli,Tatiele Anete Bergamo; Reichardt,Klaus; Favarin,José Laércio; Bacchi,Osny Oliveira Santos; Silva,Adriana Lúcia; Timm,Luis Carlos.
Knowledge about the fate of fertilizer nitrogen in agricultural systems is essential for the improvement of management practices in order to maximize nitrogen (N) recovery by the crop and reduce N losses from the system to a minimum. This study involves fertilizer management practices using the 15N isotope label applied in a single rate to determine the fertilizer-N balance in a particular soil-coffee-atmosphere system and to deepen the understanding of N plant dynamics. Five replicates consisting of plots of about 120 plants each were randomly defined within a 0.2 ha coffee plantation planted in 2001, in Piracicaba, SP, Brazil. Nine plants of each plot were separated in sub-plots for the 15N balance studies and treated with N rates of 280 and 350 kg ha-1...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coffee crop; Nitrogen uptake; N dynamics; 15N tracer studies; Stable isotope.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832008000400010
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Hydro-Physical Properties of a Typic Hapludult under the Effect of Rice Husk Ash Rev. Bras. Ciênc. Solo
Islabão,Gláucia Oliveira; Lima,Cláudia Liane Rodrigues de; Vahl,Ledemar Carlos; Timm,Luis Carlos; Teixeira,Juliana Brito da Silva.
ABSTRACT The combustion of rice husk generates a partially burnt mixture called rice husk ash (RHA) that can be used as a source of nutrients to crops and as a conditioner of soil physical properties. The objective of this study was to evaluate the effect of RHA levels on the hydro-physical properties of a Typic Hapludult. The experimental design was composed of random blocks with four replications, which comprised plots of 24 m2 and treatments with increasing RHA rates: 0, 40, 80 and 120 Mg ha-1. Undisturbed soil samples were collected in the soil layers of 0.00-0.10 and 0.10-0.20 m after nine months of RHA application, using steel cylinders (0.03 m of height and 0.047 m of diameter). These samples were used to determine soil bulk density (Bd), total soil...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bulk density; Soil porosity; Available water capacity; Soil compressibility; Soil aggregation.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100407
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Interação solo-planta avaliada por modelagem estatística de espaço de estados Scientia Agricola
Timm,Luis Carlos; Fante Jr.,Lorival; Barbosa,Emanuel Pimentel; Reichardt,Klaus; Bacchi,Osny Oliveira Santos.
Para estudar a interação solo-planta utilizou-se um modelo de espaço de estados (regressão dinâmica) comparativamente à um modelo de regressão estática, em versão convencional e em versão sequencial. Para tal, foram utilizados dados experimentais de densidade do solo, macroporosidade, microporosidade e porosidade total de um solo Latossolo Vermelho Escuro, além da densidade radicular por comprimento de raiz por unidade de volume, de uma cultura de aveia forrageira. Das variáveis explanatórias estudadas, a porosidade total apresentou correlação bastante significativa com a densidade radicular, considerada como a variável resposta do estudo. Um modelo de regressão estática representado na forma de espaço de estados com estimação seqüencial forneceu um...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Variabilidade espacial; Regressão dinâmica; Regressão estática; Estimação seqüencial.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400025
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INTERVALO HÍDRICO ÓTIMO EM SOLO CONSTRUÍDO APÓS MINERAÇÃO DE CARVÃO EM DIFERENTES LIMITES CRÍTICOS DE RESISTÊNCIA À PENETRAÇÃO E UMIDADE Rev. Bras. Ciênc. Solo
Miola,Ezequiel Cesar Carvalho; Pauletto,Eloy Antonio; Lima,Cláudia Liane Rodrigues de; Pinto,Luiz Fernando Spinelli; Timm,Luis Carlos.
Na quantificação do intervalo hídrico ótimo (IHO), são utilizados diferentes limites críticos de resistência à penetração (RP) e umidade na capacidade de campo (θCC). Para solos agrícolas, esses valores estão sendo documentados na literatura. Entretanto, para solos construídos após mineração de carvão, constata-se grande lacuna de informações. O objetivo deste trabalho foi quantificar a faixa de variação do intervalo hídrico ótimo de um solo construído sob diferentes plantas de cobertura na área de mineração de carvão de Candiota, sul do Brasil, considerando diferentes limites críticos de umidade do solo na capacidade de campo e de resistência à penetração. Foram avaliadas no experimento, em blocos casualizados com quatro repetições, as seguintes plantas...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Densidade crítica; Plantas de cobertura; Qualidade do solo; Solos construídos.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000200563
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Multivariate analysis applied to the study of the relationship between soil and plant properties in a peach orchard Rev. Bras. Ciênc. Solo
Terra,Viviane Santos Silva; Valgas,Ricardo Alexandre; Reisser Júnior,Carlos; Timm,Luis Carlos; Pereira,José Francisco Martins; Carvalho,Flávio Luiz Carpena; Oldoni,Henrique.
In the State of Rio Grande do Sul, the municipality of Pelotas is responsible for 90 % of peach production due to its suitable climate and soil conditions. However, there is the need for new studies that aim at improved fruit quality and increased yield. The aim of this study was to evaluate the relationship that exists between soil physical properties and properties in the peach plant in the years 2010 and 2011 by the technique of multivariate canonical correlation. The experiment was conducted in a peach orchard located in the municipality of Morro Redondo, RS, Brazil, where an experimental grid of 101 plants was established. In a trench dug beside each one of the 101 plants, soil samples were collected to determine silt, clay, and sand contents, soil...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Prunus persica; Canonical correlation; Soil physical properties.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000300007
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Nitrogen dynamics in a soil-sugar cane system Scientia Agricola
Oliveira,Júlio César Martins de; Reichardt,Klaus; Bacchi,Osny O.S.; Timm,Luis Carlos; Dourado-Neto,Durval; Trivelin,Paulo César Ocheuse; Tominaga,Tânia Toyomi; Navarro,Roberta de Castro; Piccolo,Marisa de Cássia; Cássaro,Fábio Augusto Meira.
Results of an organic matter management experiment of a sugar cane crop are reported for the first cropping year. Sugar cane was planted in October 1997, and labeled with a 15N fertilizer pulse to study the fate of organic matter in the soil-plant system. A nitrogen balance is presented, partitioning the system in plant components (stalk, tip and straw), soil components (five soil organic matter fractions) and evaluating leaching losses. The 15N label permitted to determine, at the end of the growing season, amounts of nitrogen derived from the fertilizer, present in the above mentioned compartments.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fertilizer; Nitrogen; N label; Soil; Sugar cane.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300015
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Selecting statistical models to study the relationship between soybean yield and soil physical properties Rev. Bras. Ciênc. Solo
Oliveira,Marcio Paulo de; Tavares,Maria Hermínia Ferreira; Uribe-Opazo,Miguel Angel; Timm,Luis Carlos.
Statistical models allow the representation of data sets and the estimation and/or prediction of the behavior of a given variable through its interaction with the other variables involved in a phenomenon. Among other different statistical models, are the autoregressive state-space models (ARSS) and the linear regression models (LR), which allow the quantification of the relationships among soil-plant-atmosphere system variables. To compare the quality of the ARSS and LR models for the modeling of the relationships between soybean yield and soil physical properties, Akaike's Information Criterion, which provides a coefficient for the selection of the best model, was used in this study. The data sets were sampled in a Rhodic Acrudox soil, along a spatial...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Autocorrelation; Cross correlation; Linear regression; State-space model; Soil and plant properties.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000100009
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Temporal changes of an alfalfa succession and related soil physical properties on the Loess Plateau, China PAB
She,Dong Li; Shao,Ming An; Timm,Luis Carlos; Reichardt,Klaus.
The objective of this work was to investigate the relationship between changes in the plant community and changes in soil physical properties and water availability, during a succession from alfalfa (Medicago sativa L.) to natural vegetation on the Loess Plateau, China. Data from a succession sere spanning 32 years were collated, and vegetative indexes were compared to changes related to soil bulk density and soil water storage. The alfalfa yield increased for approximately 7 years, then it declined and the alfalfa was replaced by a natural community dominated by Stipa bungeana that began to thrive about 10 years after alfalfa seeding. Soil bulk density increased over time, but the deterioration of the alfalfa was mainly ascribed to a severe reduction in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Medicago sativa; Agropastoral transition zone; Community characteristics; Soil physical properties; Soil water restoration.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009000200011
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Variability of water balance components in a coffee crop in Brazil Scientia Agricola
Silva,Adriana Lúcia da; Roveratti,Renato; Reichardt,Klaus; Bacchi,Osny Oliveira Santos; Timm,Luis Carlos; Bruno,Isabeli Pereira; Oliveira,Julio César Martins; Dourado Neto,Durval.
Establishing field water balances is difficult and costly, the variability of their components being the major problem to obtain reliable results. This component variability is presented herein for a coffee crop grown in the Southern Hemisphere, on a tropical soil with 10% slope. It was observed that: rainfall has to be measured with an appropriate number of replicates; irrigation can introduce great variability into calculations; evapotranspiration, calculated as a remainder of the water balance equation, has exceedingly high coefficients of variation; the soil water storage component is the major contributor in error propagation calculations to estimate evapotranspiration; and that runoff can be satisfactorily controlled on the 10% slope through crop...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Component variability; Rainfall; Evapotranspiration; Soil water storage.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000200001
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