Characterization of mobile aluminium in acid soils

Bache, B. W.; Sharp, George S.

doi:10.1016/0016-7061(76)90080-x

Cited by 26 publications

(12 citation statements)

References 10 publications

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“…Extrapolation of the second linear portion of the curve to the y-axis yields exchangeable Al. Bache and Sharp (1976a) showed, however, that some soils behaved differently from the assumed pattern of sharply decreasing release of Al because the non-exchangeable Al fraction did not have a constant rate of release. Nevertheless, they suggested that 1M KCl extraction could provide rapid estimates of exchangeable Al.…”

Section: Soonmentioning

confidence: 81%

“…Hoyt and Nyborg (1972) suggested that 0.01M CaCl2 soluble Al was a suitable measure of soluble Al intensity. Bache and Sharp (1976a) suggested use of the Al activity ratio 2pAl -3p(Ca + Mg), and Conyers et al (1991) (Lin and Coleman, 1960;Little, 1964;Bair and Pratt, 1961). It has been proposed that exchangeable Al can be distinguished from nonexchangeable Al by plotting cumulative Al released on leaching with KCl vs time.…”

Section: Soonmentioning

confidence: 99%

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Fractionation of extractable aluminum in acid soils: A review and a proposed procedure

Soon¹

1993

Communications in Soil Science and Plant Analysis

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Different forms of soil aluminum (Al) are involved in the retention of anions and cations, phytotoxicity of Al in acid soils, CEC reduction and soil physical properties such as aggregate stability and water infiltration. Therefore it is desirable to quantify the different forms of Al in soil especially acidic soils. A rationale was developed from a literature survey to identify the following fractions of Al: (a) exchangeable quantified by 1M KC1 extraction; (b) organic bound quantified by 0.1M CuCl 2 + 0.5M KC1 extraction; (c) sorhed Al extractable with 1M NE 4 OAc at pH 4.0; (d) amorphous Al oxide and hydroxide and amorphous aluminosilicates (if present) extractable with 0.2M ammonium oxalate at pH 3.0; and (e) interlayered Al extractable with 0. 33M sodium citrate at pH 7.3. Pools (a), (b), and (c) are extracted sequentially. Amorphous Al oxide and hydroxide (pool d) is calculated from ammonium oxalate extractable Al minus (a + b + c). Interlayered Al is calculated from sodium citrate extractable Al minus ammonium oxalate extractable Al. The latter two extractions are done on separate subsamples of soils. From preliminary studies and data for 13 soil samples it is suggested that this fractionation of soil Al is more meaningful than that obtained by the KC1 -> K 4 P 2 O 7 -> ammonium oxalate > citrate-bicarbonate-dithionite extraction sequence. INTRODUCTIONAluminum is the most abundant metallic element in the earth's crust and soils. In soils most of the Al is tied up in the crystal lattice of alumino-silicate minerals. The remaining Al occurs in diverse forms, consequently its chemistry is complex.

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Section: Soonmentioning

confidence: 81%

Section: Soonmentioning

confidence: 99%

Fractionation of extractable aluminum in acid soils: A review and a proposed procedure

Soon¹

1993

Communications in Soil Science and Plant Analysis

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“…If it is assumed that the A1 concentration in soil solution is the A1 variable determining clover yield, then these results suggest that Al saturation is a better estimate of this variable than soil solution Al as determined by the method proposed by Bache & Sharp (1976). In addition, the values for soil solution A1 reported here, and by Bache & Sharp (1976), are an order of magnitude greater than the concentrations r 2 z 0 5 2 9 . .…”

Section: Factors Determining Cheryieldmentioning

confidence: 53%

“…Total exchangeable bases (TEB) were determined by igniting the ammonium acetate extract to leave the bases as carbonates and oxides, and titrating the residue with acid (Metson, 1971). Exchangeable Al was extracted by shaking 1 g soil with 25 ml M KCl (Bache & Sharp, 1976), and Al in the filtered extract was determined by the aluminon method (Hsu, 1963). Available P was extracted with sodium bicarbonate (Olsen & Sommen, 1982) and determined by the molybdenum blue method (Watanabe & Olsen, 1965).…”

Section: Chemical Analysesmentioning

confidence: 99%

Soil acidity factors and growth of white clover (Trifolium repens L.) in acid hill soils

Wood

Cooper

1985

Soil Use and Management

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Correlation analysis was used to determine the main factors related to soil pH and to yield of white clover in a range of hill soils. Results for 109 Northern Ireland pasture soils showed that pH @I2()) was significantly correlated with exchangeable Ca, total exchangeable bases, base saturation, P, exchangeable .AI and A1 saturation, but not with exchangeable Mn. Clover yield (dry weight of shoots) in 12 acid soils from Northern Ireland, Scotland and the Falkland Islands was significantly correlated with exchangeable (: a, total exchangeable bases and Al saturation. The results support the use ofAl saturation rather than exchangeable A1, soil solution Al or pH when calculating lime requirements to overcomc these limiting factors in hill soils.

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“…A method commonly used is successive extraction with an unbuffered salt solution (e.g., KCI, NH4CI, NH4NO3) adjusted to the soil pH (Skeen and Sumner, 1967;Sivasubramaniam and Talibudeen, 1972;Prakash and Bhasker, 1974;Cabrera and Talibudeen, 1977). Bache and Sharp (1976a) attributed this slowly released AI to disordered aluminosilicates, A1 interlayers in vermiculite clays and organic AI complexes in soils. Not much attention has been paid however to similar measurements of the kinetics of A1 extraction from pure minerals such that rate parameters can be evaluated, especially for the 'slow release' reaction, and related to such measurements with acid soils.…”

Section: Introductionmentioning

confidence: 99%

The Release of Aluminum from Aluminosilicate Minerals. I. Kinetics

Cabrera

Talibudeen

1978

Clays and clay miner.

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Abstract--The rates of release of AI by M NH~NO3 (pH 3) from minerals saturated with AI ions at pH 3 suggest that AI ions migrated from the surface layers and the matrix cores of kaolinite, montmorillonite, illite, and biotite, but only from the matrix core of muscovite mica. From the 0.25-0.5 p.m kaolinite and montmorillonite, part of the 'surface' A1 is released 'instantaneously' and the rest by first order kinetics, but the coarse 1.5-2.5 ttm kaolinite has only the former component. From illite and biotite, 'surface' A1 is released by 'bulk diffusion' kinetics suggesting the existence of disturbed peripheral layers of finite thickness. The diffusion coefficients, D,., for the matrix core follow the trend: mica = biotite > illite > montmorillonite > kaolinite.Based on models proposed in previous work, the ionic composition of the "surface' AI is calculated. This shows that (1) this composition varies according to the mineral from 3 to 100% AI 3 § the remainder being in the hydrolyzed form, and (2) the apparent hydrolysis constants are different for each mineral and significantly different from those of AI ions in solution.

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Characterization of mobile aluminium in acid soils

Cited by 26 publications

References 10 publications

Fractionation of extractable aluminum in acid soils: A review and a proposed procedure

Fractionation of extractable aluminum in acid soils: A review and a proposed procedure

Soil acidity factors and growth of white clover (Trifolium repens L.) in acid hill soils

The Release of Aluminum from Aluminosilicate Minerals. I. Kinetics

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