Sistema de aquisição de dados para equipamento de medida da permeabilidade intrínseca do solo ao ar

Silveira, Luciano Roberto da; Brito, Alexsandro dos Santos; Mota, Jaedson Claúdio Anunciato; Moraes, Sérgio Oliveira; Libardi, Paulo Leonel

doi:10.1590/s0100-06832011000200012

Cited by 9 publications

(14 citation statements)

References 12 publications

(13 reference statements)

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“…An amount of air, corresponding to the pressure of 1 kPa in the reservoir, passed through the volumetric ring containing an undisturbed soil sample, balanced at tensions of 2, 6, 10, 33, and 100 kPa. During the procedure, the pressure decay over time was measured electronically until reaching a balance with the atmospheric pressure using the software PermeAr, v.1.0 (SILVEIRA et al, 2011). The coefficient of soil air permeability (K air ) was determined using equation 1, ,…”

Section: Methodsmentioning

confidence: 99%

Response Function for the Srelative Index in Cambisol Treated With and Without Bovine Liquid Biofertilizer

et al. 2018

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The present study aimed at assessing the influence of physical properties associated with soil structure on the S relative index. Two soil conditions under Ficus carica L. cultivation were studied (with or without liquid bovine biofertilizer in the irrigation water), in the 0-0.1 m and 0-0.3 m layers. Disturbed and undisturbed soil samples were collected from the above-mentioned layers and physical analyzes, pertinent to the study objective, were performed. The response function model was applied to verify how the soil independent physical variables influence on the S relative index in the 0-0.1 m and 0-0.3 m layers, with 0 and 60% biofertilizer, being combined two to two. Once the response functions were known, the slopes of both functions were compared, being represented by the coefficients β11-β12 and β21-β22. This comparison enabled verifying whether there was an effect of the treatments on the response variable. In addition, the standard error of the difference between coefficients was calculated, and the Student's t-test applied. The method of multiple regression was also used to confirm the effect of the variables on the S relative index for the 0-0.3 m layer in both treatments. Then, the variables with greater weight were selected by a backward elimination method to estimate the S relative . The results showed that the S relative index is strongly influenced by properties of the porous fraction, with total porosity and continuity of pores being of significant influence. Management with liquid bovine biofertilizer results in improvement in the soil structure, with effects measured by the S relative index.Keywords: S index. Soil structure. Organic matter. FUNÇÃO DE RESPOSTA PARA O ÍNDICE S RELATIVO EM CAMBISSOLO TRATADO COM E SEM BIOFERTILIZANTE LÍQUIDO BOVINORESUMO -Objetivou-se com esta pesquisa estudar a influência de atributos físicos associados à estrutura do solo no índice S relativo . Foram contempladas duas situações de solo (sob cultivo de Ficus carica L., sem aplicação e com aplicação de biofertilizante bovino líquido na lâmina de irrigação), nas camadas de 0-0,1 m e 0 -0,3 m. Foram coletadas amostras de solo com estrutura preservada e não preservada nas camadas supracitadas e realizadas análises físicas pertinentes ao objetivo do estudo. Foi aplicado o modelo de função de resposta para verificar como as variáveis físicas do solo independentes influenciam no S relativo , nas camadas de 0-0,1 m e 0-0,3 m tratadas com 0 e 60 % do biofertilizante combinadas duas a duas. Conhecidas as funções de resposta compararam-se as inclinações de ambas as funções, representadas pelos coeficientes β 1 1-β 1 2 e β 2 1-β 2 2, para verificar se houve efeito dos tratamentos na variável resposta. Além disso, calculou-se o erro padrão da diferença entre os coeficientes e aplicou-se o teste t de Student. Também foi aplicado o método de regressão múltipla para verificar o efeito das variáveis sobre o S relativo para a camada de 0-0,3 m em ambos os tratamentos. Em seguida, por meio do método backward elimination foram sel...

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Section: Methodsmentioning

confidence: 99%

Response Function for the Srelative Index in Cambisol Treated With and Without Bovine Liquid Biofertilizer

et al. 2018

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“…Intrinsic soil air permeability was determined through the decreasing pressure method (Kirkham, 1946;Neves et al, 2007;Silva et al, 2009;Silveira et al, 2011). A volume of air, corresponding to the pressure of 1 kPa in the reservoir, was passed through the volumetric ring containing an undisturbed soil sample, equilibrated at tensions of 2, 6, 10, 33 and 100 kPa.…”

Section: Analysesmentioning

confidence: 99%

“…A volume of air, corresponding to the pressure of 1 kPa in the reservoir, was passed through the volumetric ring containing an undisturbed soil sample, equilibrated at tensions of 2, 6, 10, 33 and 100 kPa. During the procedure, the decrease in pressure over time was measured, until the equilibrium with the atmospheric pressure, using the software PermeAr, v.1.0 (Silveira et al, 2011). Soil air permeability coefficient (K air ) was determined using equation 2:…”

Section: Analysesmentioning

confidence: 99%

Liquid Bovine Biofertilizer and Cultivation Effects on the Porosity of a Typic Haplocambids as a Function of Cultivation and Dose

Alencar

Chaves

Freire

et al. 2016

Rev. Bras. Ciênc. Solo

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ABSTRACT:The soil porous space is where processes related to gases and soil solution occur, and provides an adequate guide for agricultural practices. This study aimed to evaluate the integrated effects of cultivation and the application of liquid bovine biofertilizer on the porous network of a Typic Haplocambids (Cambissolo Háplico Ta Eutrófico) cultivated with figs (Ficus carica L.). Four treatments were evaluated (under fig cultivation with the application of 20, 40 and 60 % of biofertilizer through irrigation, a control treatment without biofertilizer and an additional treatment -soil under natural vegetation). Disturbed and undisturbed soil samples were collected in three soil layers (0.0-0.1, 0.1-0.2 and 0.2-0.3 m) with four replicates. The following physical properties were analyzed: particle-size distribution, soil bulk and particle densities, and soil water retention curve. The coefficient of intrinsic soil air permeability was calculated based on the equation that considers the decreasing pressure method. Soil porosity, pore continuity index and blocked porosity were calculated and pore length was estimated. Compared with the native forest, pore network quality is improved, if not maintained, when the soil is cultivated under the conditions described in this experiment. In the conditions of cultivation, the application of bovine biofertilizer, for supplying sediments that block or reduce the size of the pores, did not improve soil air permeability. The cases where pore network quality was worsened in soil porosity as a result of the applied treatments (Biofertilizer 20 %, Biofertilizer 40 % and Biofertilizer 60 % for the layer of 0.0-0.1 m and Biofertilizer 60 % for 0.1-0.2 m), although not considered critical to plant development, point to the need for specific management practices (for instance, avoid coarse residues in the biofertilizer before its application) to avoid soil degradation.

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“…A degradação estrutural do solo reduz o fluxo de água e ar, prejudicando as culturas agrícolas, que passam a não expressaro seu potencial genético. Nesse sentido, a permeabilidade do solo ao ar é um atributo que pode indicar problemas estruturais (SILVEIRA et al, 2011;GUEDES FILHO et al, 2015).…”

Section: Introductionunclassified

Permeabilidade Ao Ar E Porosidade De Solos Na Região Semiárida

Jesus¹,

Brito²,

Silva³

et al. 2017

Reveng

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A avaliação da qualidade física do solo tem sido realizada por meio de índices de qualidade do solo, os quais são determinados, muitas vezes, por método que necessita de elevado tempo, alto custo e/ou muito laborioso, enquanto a permeabilidade intrínseca do solo ao ar é rápida e de baixo custo. Dessa maneira, o objetivo do trabalho foi caracterizar a facilidade de um Latossolo Vermelho Amarelo e um Planossolo Háplico, da região de Guanambi, em transportar ar, por meio da permeabilidade dos solos ao ar. O delineamento experimental foi inteiramente aleatorizado, com quatro tratamentos (T1 e T2 – Permeabilidade ao ar do Latossolo Vermelho Amarelo nas profundidades de 0,1 e 0,2 m, respectivamente, e T3 e T4 – Permeabilidade ao ar do Planossolo Háplico nas profundidades de 0,1 e 0,2 m, respectivamente) e 10 repetições. Observou-se que o Latossolo Vermelho Amarelo teve uma permeabilidade ao ar mais elevada comparado ao Planossolo Háplico nas duas profundidades avaliadas.

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Sistema de aquisição de dados para equipamento de medida da permeabilidade intrínseca do solo ao ar

Cited by 9 publications

References 12 publications

Response Function for the Srelative Index in Cambisol Treated With and Without Bovine Liquid Biofertilizer

Response Function for the Srelative Index in Cambisol Treated With and Without Bovine Liquid Biofertilizer

Liquid Bovine Biofertilizer and Cultivation Effects on the Porosity of a Typic Haplocambids as a Function of Cultivation and Dose

Permeabilidade Ao Ar E Porosidade De Solos Na Região Semiárida

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