Transport Parameters of Potassium From Different Sources in Soil Columns

Vilela, Nathane Manuelle Silva; Thebaldi, Michael Silveira; Leal, Bruno de Paula; Silva, Ascânio V.; Martins, Ivani Pose

doi:10.1590/1809-4430-eng.agric.v38n1p135-141/2018

Cited by 7 publications

(5 citation statements)

References 22 publications

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“…The most appropriate method to estimate these parameters is the fitting of theoretical models to experimental laboratory and field data. This can be done by using computer programs such as STANMOD software (STudio of ANalytical MODels) (VILELA et. al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Modeling Vertical Mobility of P in Regosols of the Brazilian Semiarid Region: Leach Column Experiment

Alves Carneiro,

Fraga,

Correa

et al. 2023

REVA

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Phosphorus (P) mobility can be high in sandy soils in tropical regions due to its high proportion of macropores, low levels of Fe and/or Al oxides, and low natural levels of organic matter. The aim of this study was to verify if the fit with convection-dispersion model (CDE) is adequate to analyze P vertical mobility in Regosols from the Brazilian semiarid region. Leaching columns were packed with two soils, fertilized with cattle manure. The columns were prepared based on the hydrodispersive parameters of the modeling with potassium bromide (KBr) and saturated flow. Soil samples were saturated with calcium chloride (CaCl2) and potassium chloride (KCl), both 0.001 mol L-1, and a pulse of 0.6 mmol L-1 of P. The hydrodispersive parameters (inverse method) were estimated using the CDE (CXTFIT). The soil samples packed in the columns, the delay factors (R) were around 1, the dispersivity values (λ) were very close, and the Péclet numbers (Pe) were greater than 10. In the P pulse transport assay, Pleached contents were on average 270.8 mg L-1, and it was observed that most of Pleached were translocated with 20 Vp, from 40 Vp the relationship between concentration and volume remains constant; hydrodynamic dispersion coefficients (D) ranged from 22.85 to 72.50 cm2 h-1, R ranged from 2.36 to 5.23, Damkohler number (ω) values were less than 1, and Pe ranged from 0.76 to 2.40. The adjustment with the CDE was efficient to demonstrate the vertical mobility of P in Regosols of the Brazilian semiarid region.

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Section: Introductionmentioning

confidence: 99%

Modeling Vertical Mobility of P in Regosols of the Brazilian Semiarid Region: Leach Column Experiment

Alves Carneiro,

Fraga,

Correa

et al. 2023

REVA

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“…Os ajustes das curvas apresentaram R 2 maior que 0,89 e RMSE menor que 0,03 para todas as situações avaliadas, sendo os melhores ajustes para as BTC do K. Desta forma, observou-se também picos da BTC mais altos para o Cldo que para o K + , isto é, ocorreu maior sorção de K + do que de Clem todos os ambientes (Figura 40). Outros estudos também evidenciaram a baixa interação do Clcom as superfícies sólidas do solo (Basso e Kiang, 2017;Vilela et al, 2018). Todavia, a sorção de Clocorreu para todos os ambientes (Figura 40a).…”

Section: Deslocamento Miscível (Dm)unclassified

Movimento de água e solutos na rizosfera

Batista¹

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Movimento de água e solutos na rizosfera / Aline Martineli Batista. -versão revisada de acordo com a Resolução CoPGr 6018 de 2011. --Piracicaba, 2022. p.Tese (Doutorado) --USP / Escola Superior de Agricultura "Luiz de Queiroz".1. Deslocamento miscível 2. Curva breakthrough 3. Estabilidade de agregados 4. Atividade microbiológica I. Título Dedico este trabalho aos grandes professores e pesquisadores pelos quais eu tive a honra de ser orientada ao longo da minha jornada acadêmica:

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“…Miranda et al (2005) obtiveram o parâmetro D para o íon K + de 2,703 cm 2 min -1 para um Latossolo Vermelho-Amarelo em colunas com altura de 20 cm, o valor do parâmetro foi superior ao encontrado para o mesmo solo neste trabalho; a justificativa está na baixa concentração (500 mg L -1 ) do soluto aplicada na BTC e a maior concentração relativa ter sido inferior a 0,9, o qual pode não ter sido suficiente para o ajuste numérico. Vilela et al (2018) determinaram o coeficiente de dispersão do íon K + de 1,871 a 2,926 cm 2 min -1 em colunas preenchidas com Latossolo Vermelho (solo arenoso) e altura de 20 cm, o maior valor ocorreu na concentração de 32 mg L -1 K + pelo cloreto de potássio e os valores do parâmetros foram distintos aos solos arenosos do presente trabalho.…”

Section: Parâmetrosunclassified

Efeito da composição físico-química e mineralógica de solos sobre a dinâmica dos íons nitrato, fósforo e potássio

Grecco¹

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Effect of physicochemical and mineralogical composition of soils on the dynamics of nitrate, phosphorus and potassium ions Fertilizer is applied to provide nutrients (solutes) for plants in required quantities, and at the right time, to facilitate economically viable agricultural production. However, in some cases excessive quantities of fertilizers are applied. Such overapplication can result in runoff and ions leaching through the soil profile, where they are unavailable to plants, and can cause surface water pollution by water erosion and eutrophication, besides of groundwater contamination and soil acidification. To avoid these environmental impacts, it is necessary to characterize the transport parameters that govern the dynamic of solutes in soil profile. These parameters are influenced by porous media properties, such as mineralogical composition of soils, that regulate the retention or dispersion of ions. The objective of this study was to evaluate the effect of physicochemical and mineralogical composition of soils on transport parameters of nitrate, phosphorus, and potassium, estimated by using the CFITIM code inside of STANMOD (STudio of ANalytical MODels) software to fit BTC's. Besides that, using of columns with different heights (10 and 20 cm) and recommended the columns height with accuracy under transport parameters by numerical simulations of the BTC's using the HYDRUS-1D model. The research was conducted in the Department of Biosystems Engineering, University of São Paulo (USP/ESALQ). The treatments were a 5 x 2 factorial with five soils and two column heights for each individual solute. The experimental design was random blocks, with three blocks, totaling 30 plots for each solute. For analysis of results, the transport parameters were submitted a variance analysis and the evaluation of model performance by statistical indexes: Root Mean Square Error (RMSE), Mean Absolute Error (MAE) and Determination Coefficient (R 2). The dispersion coefficient for PV soil were significantly different from those for other soils, for all ions. In front of the different heights of the columns, PV, PVAe, NV and PVAd soils showed significant differences in retardation factor, and distribution and dispersion coefficients, for nitrate and potassium ions. The parameters obtained from 20 cm columns were accurate than those obtained from 10 cm height, based on adequate performance of HYDRUS-1D model in BTC's simulations of sandy and clay soils.

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Transport Parameters of Potassium From Different Sources in Soil Columns

Cited by 7 publications

References 22 publications

Modeling Vertical Mobility of P in Regosols of the Brazilian Semiarid Region: Leach Column Experiment

Modeling Vertical Mobility of P in Regosols of the Brazilian Semiarid Region: Leach Column Experiment

Movimento de água e solutos na rizosfera

Efeito da composição físico-química e mineralógica de solos sobre a dinâmica dos íons nitrato, fósforo e potássio

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