Transporte de fósforo e de potássio em colunas com agregados de um latossolo vermelho distrófico

Araújo, Carlos A. S.; Ruíz, Hugo Alberto; Ferreira, Paulo Afonso; Silva, D. J.; Carvalho, M. A.

doi:10.1590/s0100-06832000000200003

Cited by 7 publications

(8 citation statements)

References 15 publications

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“…2), the sigmoidal behavior was slightly different in the Eutrophic Cambisol soil, wherein it had a marked peak rise compared with the other studied soils. According to Araújo et al (2000), this may occur due to the low cation adsorption capacity of this material. Araújo et al (2000) reported that during displacement, the potassium shifter fluid was attracted by the colloids, displacing the calcium, which accompanied the phosphate and thus keeping the system electrostatically constant.…”

Section: Resultsmentioning

confidence: 99%

Contamination Potential of Specific Ions in Soil Treated With Reject Brine From Desalination Plants

et al. 2016

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-Percolation columns constructed in the Laboratory can predict the degree of contamination in soil due to reject brine disposal and can be a tool for reducing environmental impacts. This study aim to evaluate the mobilization of ions in reject brine from desalination process by reverse osmosis. The mobilization of the contaminant ions in the saline waste was studied in glass percolation columns, which were filled with soil of contrasting textures (eutrophic CAMBISOL, typic dystrophic Red OXISOL, ENTISOL Quartzipsamment). Experiments ware repeated three times each, and the initial and final concentrations of the ion contaminants were analyzed. The pollution potential of this wastewater was determined by the retardation factor and dispersion-diffusion coefficient of K + , Cl -and Na + for each studied soil. The differences in the displacement curves of the ions present in the saline waste among various soil types were analyzed. The Entisol Quartzipsamment showed a higher forward speed of the ions K + and Cl -(greater retardation factor, i.e., greater power of the subsurface contamination for these ions). In typic dystrophic Red OXISOL, the ions move with greater ease and therefore produced greater groundwater contamination. In eutrophic CAMBISOL, the low coefficient of diffusion-dispersion in all ions was evaluated (i.e., reduced ion mobility is directly influenced by their exchangeable levels).Keywords: Semi-arid. Water reuse. Reverse osmosis. POTENCIAL CONTAMINANTE DE ÍONS ESPECÍFICOS EM SOLOS TRATADOS COM

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Section: Resultsmentioning

confidence: 99%

Contamination Potential of Specific Ions in Soil Treated With Reject Brine From Desalination Plants

et al. 2016

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“…Sintomas de deficiência na cultura da cana-deaçúcar aparecem primeiramente nas folhas mais velhas, com mosqueado (áreas verde-claras e escuras) com margens das folhas cloróticas ( Em razão da elevada demanda por esse nutriente em cultivos agrícolas, estudos sobre a dinâmica no solo têm se tornado frequente (ARAUJO et al, 2000(ARAUJO et al, , 2007MIRANDA et al, 2005;KOLAHCHI;JALALI, 2006;MELO et al, 2006;RIVERA et al, 2006;PINHO;MIRANDA, 2014). Para Kolahchi e Jalali (2006), uma das justificativas para se estudar a movimentação do potássio no solo está na sua implicação em relação à eficiência do uso do fertilizante, além disso, as concentrações do elemento podem aumentar substancialmente no lençol freático pelo processo de lixiviação em áreas usadas para fins agrícolas.…”

Section: Potássiounclassified

Caracterização do volume de solo molhado em diferentes fases de desenvolvimento da cana-de-açúcar sob gotejamento subsuperficial

Grecco¹

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“…ou Curvas de Distribuição de Efluentes, realizadas em laboratório a partir de uma coluna de solo saturada (Araujo et al, 2000;Miranda et al, 2005;Moradzadeh et al, 2014;Pinho and Miranda, 2014;Rivera et al, 2008Rivera et al, , 2006Rossi et al, 2007;Silva et al, 2016Silva et al, , 2015.…”

Section: Código Cfitimunclassified

“…Comparando os resultados com outros estudos, o de Mansell et al (1985) mostrou o fator de retardamento do fósforo em um Neossolo Quartzarênico em colunas com altura de 14 cm não irrigadas variou de 4,60 a 4,80 e para as colunas irrigadas com águas residuárias foi de 2,50 a 3,0; os valores do parâmetro R se aproximaram com os solos arenosos do presente estudo quando houve irrigação, em que foi responsável em reduzir a retenção do íon pelos colóides. Araujo et al (2000) utilizaram colunas com altura de 20 cm para determinar o fator de retardamento do fósforo em diferentes classes de agregados no Latossolo Vermelho distrófico, cuja variação foi de 2,784 a 3,710 e o maior valor do parâmetro foi no menor tamanho (< 0,105 mm) do agregado; esses valores foram semelhantes ao solo NV, sendo ambos pertencente a classe textural argilosa. Em um solo arenoso com aplicação de diversas fontes do íon PO4 3-(KH2PO4, lagoas de estabilização de dejetos de gado leiteiro e de suínos) foram determinados o parâmetro R de 5,3; 13,1 e 16,0, respectivamente, em colunas de 10 cm e os das lagoas apresentaram os maiores valores de pH, cuja característica influenciou bastante na retenção do soluto (Kang et al, 2011).…”

Section: Fósforounclassified

“…Comparação entre médias dos tratamentos pelo teste Tukey significativo a 5% para o coeficiente de dispersão do íon P-PO4 3-. respectivamente, em colunas com altura de 14 cm, sendo os valores superiores aos encontrados para os solos arenosos (Mansell et al, 1985). Araujo et al (2000) obtiveram a variação dos coeficientes de dispersão de 0,099 a 0,723 cm 2 min - Generoso et al (2017) encontraram os parâmetros D em três concentrações distintas do íon PO4 3em colunas com altura de 20 cm, sendo a variação de 0,933 a 1,792 e de 0,891 a 2,980 cm 2 min -1 para os solos argiloso e arenoso, respectivamente, os maiores valores foram observados nas menores concentrações do soluto e a maior dispersão do fósforo ocorreu no solo arenoso, como visto no presente trabalho.…”

Section: Fósforounclassified

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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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Transporte de fósforo e de potássio em colunas com agregados de um latossolo vermelho distrófico

Abstract: RESUMO O objetivo do trabalho foi comparar os coeficientes dispersivo-difusivos de fósforo e de potássio e descrever o transporte desses nutrientes em diferentes classes de agregados de um Latossolo

Cited by 7 publications

References 15 publications

Contamination Potential of Specific Ions in Soil Treated With Reject Brine From Desalination Plants

Contamination Potential of Specific Ions in Soil Treated With Reject Brine From Desalination Plants

Caracterização do volume de solo molhado em diferentes fases de desenvolvimento da cana-de-açúcar sob gotejamento subsuperficial

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

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