Permeâmetro de carga decrescente associado a programa computacional para a determinação da condutividade hidráulica do solo saturado

Gubiani, Paulo Ivonir; Reinert, Dalvan José; Reichert, José Miguel; Gelain, Neiva Somavilla; Minella, Jean Paolo Gomes

doi:10.1590/s0100-06832010000300041

Cited by 21 publications

(13 citation statements)

References 2 publications

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“…Field capacity (FC) was considered as the volumetric moisture at a suction of 10 kPa (pores with diameter <30 µm); the permanent wilting point (PWP) as the volumetric moisture at a suction of 1,500 kPa (pores with diameter <0.2 µm); and the available water content (AW) as the volumetric moisture lost between suctions of 10 and 1,500 kPa. The saturated hydraulic conductivity of the soil was determined in a variable head permeameter, as described by Gubiani et al (2010) for undisturbed samples.…”

Section: Databasementioning

confidence: 99%

Pedotransfer functions to estimate retention and availability of water in soils of the state of Santa Catarina, Brazil

Costa¹,

Albuquerque

Almeida

et al. 2013

Rev. Bras. Ciênc. Solo

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SUMMARYStudies on water retention and availability are scarce for subtropical or humid temperate climate regions of the southern hemisphere. The aims of this study were to evaluate the relations of the soil physical, chemical, and mineralogical properties with water retention and availability for the generation and validation of continuous point pedotransfer functions (PTFs) for soils of the State of Santa Catarina (SC) in the South of Brazil. Horizons of 44 profiles were sampled in areas under different cover crops and regions of SC, to determine: field capacity (FC, 10 kPa), permanent wilting point (PWP, 1,500 kPa), available water content (AW, by difference), saturated hydraulic conductivity, bulk density, aggregate stability, particle size distribution (seven classes), organic matter content, and particle density. Chemical and mineralogical properties were obtained from the literature. Spearman's rank correlation analysis and path analysis were used in the statistical analyses. The point PTFs for estimation of FC, PWP and AW were generated for the soil surface and subsurface through multiple regression analysis, followed by robust regression analysis, using two sets of predictive variables. Soils with finer texture and/or greater organic matter content retain more moisture, and organic matter is the property that mainly controls the water availability to plants in soil surface horizons. Path analysis was useful in understanding the relationships between soil properties for FC, PWP and AW. The predictive power of the generated PTFs to estimate FC and PWP was good for all horizons, while AW was best

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Section: Databasementioning

confidence: 99%

Pedotransfer functions to estimate retention and availability of water in soils of the state of Santa Catarina, Brazil

Costa¹,

Albuquerque

Almeida

et al. 2013

Rev. Bras. Ciênc. Solo

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“…Amostras indeformadas foram coletadas com o auxílio de anéis metálicos, com 5,0 cm de altura e 5,0 cm de diâmetro, os quais foram acondicionados em recipientes metálicos hermeticamente fechados. Nestas amostras foram determinadas: a umidade gravimétrica (UG), macroporosidade, microporosidade e densidade do solo (Ds), segundo metodologia sugerida pela Empresa Brasileira de Pesquisa Agropecuária (1997); e a condutividade hidráulica saturada (Ksat), pelo método do permeâmetro de carga constante (GUBIANI et al, 2010). Em amostras com estrutura alterada foi determinada a estabilidade de agregados, expressa pelo diâmetro médio geométrico (DMG) (EMPRESA BRASILEIRA DE PESQUISA AGROPECUÁRIA, 1997).…”

Section: Methodsunclassified

Atributos do solo e qualidade de frutos nos sistemas convencional e orgânico de produção de maçãs no Sul do Brasil1

Amarante¹,

Rosa²,

Albuquerque³

et al. 2015

Rev. Ciênc. Agron.

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RESUMO -O presente estudo teve como objetivo avaliar as características físicas, químicas e biológicas do solo, a composição mineral e a qualidade de frutos, em pomares de maçãs 'Royal Gala' conduzidos sob os sistemas de produção convencional (CON) e orgânico (ORG), em um Nitossolo Háplico. Na linha de cultivo das plantas, o solo no ORG apresentou melhor qualidade física (maiores valores de estabilidade dos agregados, condutividade hidráulica saturada e porosidade total, e menor densidade), química [menor acidez e maiores valores de Ca e Mg trocáveis, carbono orgânico total (COT) e nitrogênio total (NT)] e biológica [maiores valores de carbono da biomassa microbiana (Cmic) e relação Cmic/COT], na camada de 0-20 cm, quando comparado ao CON. Como no ORG não foram utilizados produtos químicos sintéticos para a superação de dormência, a colheita comercial dos frutos ocorreu um mês após o CON. Apesar desta diferença na época de colheita, frutos cultivados sob o sistema ORG apresentam na colheita menor índice de iodo-amido e maiores valores de firmeza de polpa e teor de sólidos solúveis, quando comparados aos valores obtidos em frutos cultivados sob o sistema CON. Frutos do ORG possuem maior percentagem de coloração vermelha da casca, porém elevada severidade de "russeting", em relação aos do sistema CON. Durante o armazenamento refrigerado convencional (quatro meses a 0 ± 0,5 o C/90-95% UR), frutos cultivados sob o sistema ORG apresentam elevada perda de firmeza de polpa, o que pode estar associado aos altos teores K e Mg na polpa e de N na casca, em relação aos cultivados sob o sistema CON. Portanto, mesmo no sistema ORG, o suprimento destes elementos pode ser demasiadamente elevado, comprometendo a preservação da qualidade pós-colheita dos frutos. Palavras-chave:Malus domestica (Borkh). Atributos do solo. Nutrição de plantas. Pós-colheita de fruto.ABSTRACT -The present study aimed to evaluate the physical, chemical and biological characteristics of the soil, and the mineral composition and quality of the fruit, in orchards of 'Royal Gala' apple, under conventional (CON) and organic (ORG) production systems, in a Haplic Nitisol. Under ORG, the soil in the cultivation furrow showed better physical quality (higher values for aggregate stability, saturated hydraulic conductivity and porosity, and lower density), chemical quality [lower acidity and higher values of exchangeable Ca and Mg, total organic carbon (TOC) and total nitrogen (TN)] and biological quality [higher values for microbial biomass carbon (Cmic) and ratio of Cmic to TOC], in the 0-20 cm layer compared to CON. Because under the ORG system synthetic chemicals for breaking dormancy were not used, commercial fruit harvesting took place one month after that of the CON system. Despite this difference in the time of harvest, fruit grown under the ORG system have, when harvested, a lower starch-iodine index and higher values for firmness and soluble solid content, when compared to values obtained in fruits grown under the CON system. Fruit under ORG has a highe...

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“…The properties include texture (sand, silt, and clay fractions), soil water content at saturation u s , and saturated hydraulic conductivity Ks (see Table 1). The Ks was determined using a falling head permeability meter (Gubiani et al 2010).…”

Section: Soil Hydrologymentioning

confidence: 99%

Influence of Soil Properties in Different Management Systems: Estimating Soybean Water Changes in the Agro-IBIS Model

et al. 2018

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The water balance in agricultural cropping systems is dependent on the physical and hydraulic characteristics of the soil and the type of farming, both of which are sensitive to the soil management. Most models that describe the interaction between the surface and the atmosphere do not efficiently represent the physical differences across different soil management areas. In this study, the authors analyzed the dynamics of the water exchange in f Corresponding author: Debora Regina Roberti, debora@ufsm.br the agricultural version of the Integrated Biosphere Simulator (IBIS) model (Agro-IBIS) in the presence of different physical soil properties because of the different long-term soil management systems. The experimental soil properties were obtained from two management systems, no tillage (NT) and conventional tillage (CT) in a long-term experiment in southern Brazil in the soybean growing season of 2009/10. To simulate NT management, this study modified the top soil layer in the model to represent the residual layer. Moreover, a mathematical adjustment to the computation of leaf area index (LAI) is suggested to obtain a better representation of the grain fill to the physiological maturity period. The water exchange dynamics simulated using Agro-IBIS were compared against experimental data collected from both tillage systems. The results show that the model well represented the water dynamics in the soil and the evapotranspiration (ET) in both management systems, in particular during the wet periods. Better results were found for the conventional tillage management system for the water balance. However, with the incorporation of a residual layer and soil properties in NT, the model improved the estimation of evapotranspiration by 6%. The ability of the Agro-IBIS model to estimate ET indicates its potential application in future climate scenarios.

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Permeâmetro de carga decrescente associado a programa computacional para a determinação da condutividade hidráulica do solo saturado

Cited by 21 publications

References 2 publications

Pedotransfer functions to estimate retention and availability of water in soils of the state of Santa Catarina, Brazil

Pedotransfer functions to estimate retention and availability of water in soils of the state of Santa Catarina, Brazil

Atributos do solo e qualidade de frutos nos sistemas convencional e orgânico de produção de maçãs no Sul do Brasil1

Influence of Soil Properties in Different Management Systems: Estimating Soybean Water Changes in the Agro-IBIS Model

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Permeâmetro de carga decrescente associado a programa computacional para a determinação da condutividade hidráulica do solo saturado

Cited by 21 publications

References 2 publications

Pedotransfer functions to estimate retention and availability of water in soils of the state of Santa Catarina, Brazil

Pedotransfer functions to estimate retention and availability of water in soils of the state of Santa Catarina, Brazil

Atributos do solo e qualidade de frutos nos sistemas convencional e org&#226;nico de produ&#231;&#227;o de ma&#231;&#227;s no Sul do Brasil1

Influence of Soil Properties in Different Management Systems: Estimating Soybean Water Changes in the Agro-IBIS Model

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Product

Resources

About

Atributos do solo e qualidade de frutos nos sistemas convencional e orgânico de produção de maçãs no Sul do Brasil1