Factors affecting zero point of charge (zpc) of variable charge soils

Sakurai, Katsutoshi; Ohdate, Yohichi; Kyuma, Kazutake

doi:10.1080/00380768.1989.10434733

Cited by 46 publications

(34 citation statements)

References 24 publications

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“…Sakurai et al (1989) verified that the Al o exerted the greatest impact on the zero point of charge (ZPC) values of Japanese and Thai soils, whereas Parks (1965) reported values between 7.5 and 8.0 and Perrott (1977) found a value of 9.3 for the ZPC of synthetic amorphous aluminum oxides. Considering that the phosphate adsorption occurs through exchange with single coordinated surface hydroxyls (Parfitt, 1978) and that these hydroxyls are probably the easiest ionizable ones, the minerals presenting higher ZPC values would have a great number of these surface hydroxyls and therefore a greater impact on P adsorption .…”

Section: Resultsmentioning

confidence: 99%

Remaining phosphorus and sodium fluoride pH in soils with different clay contents and clay mineralogies

Alves¹,

Lavorenti

Agricultura³

et al. 2004

Pesq. agropec. bras.

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-The remaining phosphorus (Prem) has been used for estimating the phosphorus buffer capacity (PBC) of soils of some Brazilian regions. Furthermore, the remaining phosphorus can also be used for estimating P, S and Zn soil critical levels determined with PBC-sensible extractants and for defining P and S levels to be used not only in P and S adsorption studies but also for the establishment of P and S response curves. The objective of this work was to evaluate the effects of soil clay content and clay mineralogy on Prem and its relationship with pH values measured in saturated NaF solution (pH NaF). Ammonium-oxalate-extractable aluminum exerts the major impacts on both Prem and pH NaF, which, in turn, are less dependent on soil clay content. Although Prem and pH NaF have consistent correlation, the former has a soil-PBC discriminatory capacity much greater than pH NaF.Index terms: ammonium-oxalate-extractable Al, phosphate adsorption, phosphorus buffer capacity. Fósforo remanescente e pH em fluoreto de sódio em solos com diferentes teores e qualidades de argilaResumo -O fósforo remanescente (Prem) tem sido utilizado para estimar o fator capacidade de P (FCP) de solos de algumas regiões do Brasil. Entre outras finalidades, o P remanescente pode também ser utilizado para estimar níveis críticos de P, S e Zn no solo, determinados com extratores sensíveis ao FCP, e para a definição das doses de P e S a serem usadas, tanto em estudos de adsorção como no estabelecimento de curvas de resposta a esses elementos. O objetivo deste trabalho foi avaliar os efeitos do teor e da composição mineralógica da fração argila do solo sobre o Prem, e sua relação com o pH medido em solução saturada de NaF (pH NaF). Tanto o Prem quanto o pH NaF são mais influenciados pelo teor de Al extraído com oxalato de amônio e menos dependentes do teor de argila. Embora a correlação entre o Prem e o pH NaF seja consistente, o Prem apresenta maior capacidade de estratificar solos quanto ao fator capacidade de fósforo que o pH NaF Termos de indexação: alumínio extraível com oxalato, adsorção de fosfato, fator capacidade de fósforo.

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Section: Resultsmentioning

confidence: 99%

Remaining phosphorus and sodium fluoride pH in soils with different clay contents and clay mineralogies

Alves¹,

Lavorenti

Agricultura³

et al. 2004

Pesq. agropec. bras.

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“…The PZSE and op values of the variable charge soils were mainly affected by the following factors (Sakurai et al 1989); the presence of organic matter, exchangeable Al, and 2 : 1 type crystalline clay minerals which shifted the PZSE value toward a lower pH range, resulting in a higher op value, whereas, presence of amorphous materials and accumulated sesquioxides shifted the PZSE value toward a higher pH range, resulting in a lower op value.…”

Section: Physico-chemical and Mineralogical Propertiesmentioning

confidence: 99%

Characterization and Distribution of Soils at Lambir Hills National Park in Sarawak, Malaysia, with Special Reference to Soil Hardness and Soil Texture.

Ishizuka

Tanaka

Sakurai

et al. 1998

Tropics

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For the rehabilitation of the degraded and abandoned land in the tropical area, it needs to define the various characteristics of remaining natural forests. This work was done to find out a physical hazard for root elongation of plant at Lambir Hills National Park, Miri, Sarawak, Malaysia, with special reference to soil hardness and soil texture. Furthermore, soil moisture and soil temperature were monitored at the hill ridge and at the valley to show their annual fluctuation. Soil physico-chemical properties at the hill ridge and the valley were also investigated.At the hill ridge, well-developed soils with a deep solum were found. Organic matter content was high only at the surface horizon (0-5 cm) where a root mat develops. Although soil moisture content fluctuated significantly, the soil was dry throughout the monitoring period. On the other hand, at the valley, soil moisture content was relatively stable even after the frequent rainfall. The small particles and nutrients at the valley have been brought by the continuous water and eroded particles supply from surroundings.Based on the topographical investigation, the study area was roughly divided into 3 categories: 1) Steep slope area : Soil and vegetation status may be often affected and modified by the land slide or soil erosion. Soil texture was sandy loam, loamy sand, or loam. Gravelly materials often appeared in the subsurface layer at the depth of 20-40 cm, which are hard for root to penetrate into. This layer can be regarded as the one with physical hazard against root penetration. 2) Gentle slope area : Soil and vegetation status are relatively stable for a long time. Soil texture was light clay or heavy clay. Transported clayey materials were accumulated to a depth below 20 cm, and/or the in-situ weathering in the deeper part could have occurred because of the relatively stable topography. 3) Ridge area : Although soil and vegetation status looks stable in view of topography, moisture condition much fluctuated. Soil texture was clay loam or sandy clay loam, which was the middle range between that of a steep slope area and a gentle slope area. The physical hazard in the soil might not be found, but the rates of root elongation and plant growth may be slow since the soil is prone to be dry.

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“…Dentre os atributos eletroquímicos, o de maior destaque para solos intemperizados das regiões tropicais é o ponto de efeito salino nulo (PESN), utilizado na descrição de fenômenos decorrentes da dupla camada elétrica de interfaces reversíveis (Sakurai et al, 1989;Alleoni & Camargo, 1994a,b;Zhang & Zhao, 1997) e na determinação de vários atributos pedológicos (Fontes et al, 2001 (Uehara & Gillman, 1981) Assim, pode-se afirmar que a densidade de carga na superfície pode ser alterada em solos com carga variável pela aplicação orientada de fertilizantes e corretivos, aumentando significativamente a CTC e, portanto, a capacidade produtiva desses solos. Uma outra característica importante acerca do PESN do solo é que ele corresponde ao ponto químico de máxima estabilidade, onde o potencial de superfície é nulo (Sposito, 1989).…”

Section: Introductionunclassified

Ponto de efeito salino nulo de Latossolos da microbacia Chico Nunes, Mato Grosso

Coringa

Weber

2008

Rev. Bras. Ciênc. Solo

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Factors affecting zero point of charge (zpc) of variable charge soils

Cited by 46 publications

References 24 publications

Remaining phosphorus and sodium fluoride pH in soils with different clay contents and clay mineralogies

Remaining phosphorus and sodium fluoride pH in soils with different clay contents and clay mineralogies

Characterization and Distribution of Soils at Lambir Hills National Park in Sarawak, Malaysia, with Special Reference to Soil Hardness and Soil Texture.

Ponto de efeito salino nulo de Latossolos da microbacia Chico Nunes, Mato Grosso

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