Capacidade máxima de adsorção de fósforo relacionada a formas de ferro e alumínio em solos subtropicais

Vilar, Cesar Crispim; Costa, Antônio Carlos Saraiva da; Hoepers, Allan; Souza, Ivan Granemann de

doi:10.1590/s0100-06832010000400006

Cited by 41 publications

(29 citation statements)

References 24 publications

(42 reference statements)

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“…The MACP values increased by 63.5 and 1,926.8 mg kg -1 for the soils SXe-Cachoeira do Sul and CHa1-São Francisco de Paula, respectively. The MACP was significantly correlated with the P-rem values (r = -0.74 ** ), as expected, because the measurement of P-rem is a point among those used in the adsorption isotherm for determination of the MACP (Vilar et al, 2010;Broggi et al, 2011); however, the correlation was not statistically significant with the clay content (r = 0.26 ns ) ( Table 3). Possibly due to the utilization of a large number of mineralogically distinct soils, the results of this work contradicts those of other studies that obtained a significant relationship between the MACP and clay (Corrêa et al, 2011;Pinto, 2012).…”

Section: Relationship Between the Physical And Chemical Properties Ofsupporting

confidence: 72%

“…The lack of correlation between the clay content and Fe OX is an indication that soil clay accumulation is not necessarily associated with the presence of Fe oxides of low crystallinity, which are described as having a high capacity of P adsorption (Hernández and Meurer, 1998;Donagemma et al, 2008). In addition to crystalline Fe oxides and clay minerals 1:1 (such as kaolinite), which have a lower potential to adsorb Fe oxides of low crystallinity, they can also significantly affect the adsorption of P, mainly due to the higher quantity generally found in soils (Torrent et al, 1994;Vilar et al, 2010). In a study with 60 RS soils, Oliveira (2015) found a significant correlation, although weak (r = -0.31 * ), between the P-rem and the area of kaolinite obtained by x ray diffraction.…”

Section: Relationship Between the Physical And Chemical Properties Ofmentioning

confidence: 99%

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Substitution of Clay Content for P-Remaining as an Index of the Phosphorus Buffering Capacity for Soils of Rio Grande do Sul

Rogeri

Gianello

Bortolon

et al. 2016

Rev. Bras. Ciênc. Solo

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Mehlich-1 soil extract is currently used in Rio Grande do Sul (RS) and Santa Catarina (SC) States, in Brazil, to evaluate soil phosphorus available to plants and Mehlich-1 is sensitive to soil buffering capacity. This limitation is overcome partly by soil separation into buffering classes based on soil clay content. However, soil clay content has some technical and operational limitations, such as the underestimation of soil clay levels in soils under no-till. The aim of this study was to evaluate the remaining phosphorus (P-rem) compared to soil clay content as an index of the buffering capacity in soils of RS. The relationship between P-rem and soil clay content was assessed using 200 soil samples from a wide range of locations across the state. In 20 representative soil types, P-rem, soil clay content, P maximum adsorption capacity, total and pedogenic Fe contents, amount of P 2 O 5 needed to increase soil P in 1 mg kg -1 extracted by Mehlich-1 and -3 methods and P capacity factor were determined. Furthermore, a pot experiment was carried out with plants to determine soil P content extracted by Mehlich-1 and -3 at the maximum technical efficiency (MET) and the maximum absorption efficiency (MEA). Correlation analyses were performed between P-rem and soil clay content and, with the attributes of soils involving the P buffering capacity. The relationship between P-rem and soil clay content was described as a decreasing exponential function; however, the adjustment was not adequate to propose critical levels for P-rem. The P-rem index was superior to soil clay index in practically all relationships with the attributes related to the soil buffering capacity of the soils. In some cases, the indexes were similar; however, P-rem was not lower than the soil clay content in any case. The P-rem is a more reliable index to represent soil buffering capacity than the soil clay content in soils from RS, and P-rem might be used to implement soil classes for Mehlich-1 and Mehlich-3 determinations of soil P.

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Section: Relationship Between the Physical And Chemical Properties Ofsupporting

confidence: 72%

Section: Relationship Between the Physical And Chemical Properties Ofmentioning

confidence: 99%

Substitution of Clay Content for P-Remaining as an Index of the Phosphorus Buffering Capacity for Soils of Rio Grande do Sul

Rogeri

Gianello

Bortolon

et al. 2016

Rev. Bras. Ciênc. Solo

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“…Os teores de P encontrados se encontram abaixo da capacidade máxima de adsorção para grande parte dos solos de regiões subtropicais (Vilar et al, 2010). Avalia-se, porém, que a aplicação continuada de adubos orgânicos e minerais pode resultar, nessas taxas, em problema de perdas de fósforo sob formas de sedimentos e problemas de ordem ambiental, como poluição de mananciais hídricos (Giasson et al, 2002).…”

Section: Resultsunclassified

Uso da terra e atributos de solos do estado do Rio Grande do Sul

Nascimento

Bissani

Levien

et al. 2014

Rev. bras. eng. agríc. ambient.

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R E S U M OA região da Encosta Inferior do Nordeste, no estado do Rio Grande do Sul, apresenta, na atividade agrícola, variações no tipo de uso do solo e sistemas de produção podendo levar à diferenciação nos atributos do solo e a processos de degradação. Com o objetivo de avaliar a granulometria e os atributos químicos do solo e compará-los em diferentes tipos de uso e manejo 78 glebas foram amostradas com oito diferentes tipos de uso, em sistemas de produção convencional e de base agroecológica (orgânico) entre 2009 e 2010 enquanto amostras de solo foram coletadas na camada de 0 a 20 cm e realizadas determinações de uma série de atributos. Os resultados destacaram, entre outros, o pH, a condutividade elétrica e os teores de zinco e fósforo com maiores valores no uso com olericultura convencional; por sua vez, o enxofre apresentou maiores teores nas áreas de viticultura. A aplicação de análise discriminante indicou que 67% das glebas tiveram enquadramento em seus usos definidos por ocasião da amostragem (originais) e a análise de componentes principais ressaltou maior semelhança entre os tipos de uso em sistema orgânico e na lavoura convencional. Alguns elementos apresentaram teores bastante altos indicando um potencial de contaminação e degradação ambiental. Land use and attributes of soils of the state of Rio Grande do Sul A B S T R A C TLower northeast hillside region, in Rio Grande do Sul state, Brazil, shows, in agricultural activities, variability in soil use and production systems, which can result in change of soil attributes and degradation processes. With the aim to evaluate particle size distribution and chemical attributes and to compare them in different soil use and management system, soil samples from 78 areas, performing eight diverse types of soil use in conventional and organic production systems, were sampled for the study, between 2009 and 2010. Soil samples were collected at 0 to 20 cm depth, and a series of attributes were determined. Results showed pH, electrical conductivity, zinc and phosphorus contents with higher values in areas of conventional vegetable production, while sulphur showed higher values in soil under grape cultivation. Discriminate analysis indicated that 67% of the areas were classified in the same use defined at the time of sampling (original use), and principal component analysis showed more similar behavior among uses in organic system, besides conventional crop. Some elements showed very high contents, indicating potential contamination and environmental risk. Palavras-chave:sistemas de produção produção agroecológica uso e manejo do solo Key words: production systems agroecological production soil use and management Revista Brasileira de Engenharia Agrícola e Ambiental IntroduçãoA busca por sistemas sustentáveis de produção agrícola tem resultado no aumento da adoção de formas de uso e manejo do solo que resultem em menor impacto ambiental, tal como na utilização de indicadores que, em médio prazo, possam contribuir na avaliação da sustentabilidade desses sistemas...

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“…Therefore, a textural index may be inappropriate for CHa-1 since it is insensitive to clay mineralogy (Rogeri et al, 2016). Low-crystallinity iron and aluminum oxyhydroxides are some of the main components of the clay fraction responsible for P adsorption (Vilar et al, 2010;Gonçalves et al, 2011). Using P-rem instead of the clay content index reassigned 45% of the soils into different buffering classes.…”

Section: Range Of Interpretationmentioning

confidence: 99%

“…Therefore, these two soil types should have very different buffering capacities. Several studies showed the effect of mineralogy on the adsorption capacity of P (Bahia Filho et al, 1983;Vilar et al, 2010;Gonçalves et al, 2011). However, the current classification system (Manual…, 2004) assumes that soil types within the same clay class all have similar P buffering capacities despite the significant differences in their mineralogies.…”

Section: Introductionmentioning

confidence: 99%

Remaining phosphorus content to determine phosphorus availability of the soils in Rio Grande do Sul

Rogeri¹,

Bortolon²,

Gianello

et al. 2017

Pesq. agropec. bras.

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-The objective of this work was to evaluate remaining P compared with soil clay content as a P buffer index to classify P extracted by the Mehlich-1 (M1) and Mehlich-3 (M3) methods in soils from the state of Rio Grande do Sul, Brazil. The experiment was carried out in a completely randomized design with five P 2 O 5 rates (0, 50, 100, 200, and 400 mg kg -1 ) and two sucessive corn crops, and three replicates, in 20 representative soils of the state. P extracted by M1 and M3 before crop planting was adjusted to P contents in biomass, considering soil buffer capacity. The division of soils into different buffering classes, based on soil clay or remaining P, improved the capacity of estimating soil available P of both methods. However, there was no difference among the correlation coefficients obtained by classifying soils according to the evaluated indexes (remaining P or soil clay) for both M1 and M3 methods. Remaining P is a viable alternative to replace soil clay content to classify soil P extracted with the M1 and M3 methods.Index terms: clay content, phosphate buffer capacity, phosphate fertilization, phosphorus adsorption, soil test. Fósforo remanescente para determinar a disponibilidade de fósforo em solos do Rio Grande do SulResumo -O objetivo deste trabalho foi avaliar o P remanescente comparado ao teor de argila como índice tampão para classificar o P extraído pelos métodos de Mehlich-1 (M1) e Mehlich-3 (M3), em solos do Rio Grande do Sul. O experimento foi realizado em delineamento inteiramente casualisado, com cinco doses de P 2 O 5 (0, 50, 100, 200 e 400 mg kg -1 ), dois cultivos sucessivos de milho, e três repetições, em 20 solos representativos do Estado. O P extraído pelos métodos M1 e M3, antes dos cultivos, foi ajustado aos conteúdos de P na biomassa, tendo-se considerado a capacidade tampão do solo. A divisão dos solos em classes de tamponamento, de acordo com o teor de argila ou com o P remanescente, melhorou a capacidade preditiva do P disponível para ambos os métodos. Todavia, não houve diferença entre os coeficientes de correlação obtidos pela classificação dos solos de acordo com os índices avaliados (P remanescente ou teor de argila), tanto para o método M1 como para o M3. A análise do P-rem é uma alternativa viável para substituir o teor de argila na classificação do P extraído pelos métodos M1 e M3.Termos de indexação: teor de argila, fator capacidade de fósforo, adubação fosfatada, adsorção de fósforo, análise de solo.

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Capacidade máxima de adsorção de fósforo relacionada a formas de ferro e alumínio em solos subtropicais

Abstract: RESUMO(1) Recebido para publicação em setembro de 2009 e aprovado em maio de 2010.

Cited by 41 publications

References 24 publications

Substitution of Clay Content for P-Remaining as an Index of the Phosphorus Buffering Capacity for Soils of Rio Grande do Sul

Substitution of Clay Content for P-Remaining as an Index of the Phosphorus Buffering Capacity for Soils of Rio Grande do Sul

Uso da terra e atributos de solos do estado do Rio Grande do Sul

Remaining phosphorus content to determine phosphorus availability of the soils in Rio Grande do Sul

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