Determination of exchangeable acidity and exchangeable aluminium in hill soils part 1 exchangeable acidity

Logan, K. A. B.; Floate, M. J. S.; Ironside, A.D.

doi:10.1080/00103628509367604

Cited by 15 publications

(8 citation statements)

References 10 publications

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“…The titrimetric method, phenolphthalein being used as indicator, presented a limitation due to the difficulty in observing the end-point and the analytic moroseness, due to the need of two step analysis (back-titration), which limits the number of samples to be analyzed by each batch. The Al 3+ values given by titration may be imprecise and untruthful in relation to solutions of known Al concentration (Logan et al, 1985). Raij et al (2001) have proposed the Al 3+ determination, when necessary, by some specific methods, such as the spectrophotometry with orange of xylenol in extracts of NH 4 Cl or even by plasma spectrometry (ICP-AES) in KCl or NH 4 Cl extracts.…”

Section: Resultsmentioning

confidence: 99%

“…The titrimetric method may present inferior sensitivity in relation to the colorimetric methods for the determination of Al (Reis, 1978;Logan et al, 1985), but it is less subject to interferences from ions present in the extract (McLean, 1965;Coscione et al, 1998). Both titrimetric and colorimetric methods present low determination rates in face of the intrinsic slowness of these methods.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Exchangeable aluminum evaluation in acid soils

Abreu-Junior¹,

Muraoka

Lavorante

2003

Sci. agric. (Piracicaba, Braz.)

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One of the main factors limiting agricultural production in tropical climate regions is mainly related to the presence of exchangeable aluminum (Al3+) in highly weathered acid soils. Four methods of Al3+ determination extracted with neutral 1 mol L¹ KCl solution were evaluated: three colorimetric methods (aluminon plus ascorbic acid, and eriochrome cyanine R by FIA) and the usual titrimetric method with back-titration. Surface samples from 20 soils of different Brazilian regions, with active acidity (0.01 mol L¹ CaCl2 pH) ranging from very high to medium (3.82 to 5.52), were used. The variance analysis revealed significant interaction among Al3+ determination methods and soil. Mean methods comparisons within each soil (Tukey, P < 0.05) indicated that, for most of the soils, the methods differed among each other, although there were high correlations between the obtained values. Al3+ values determined for soil samples by titration varied between 0.15 and 14.71 mmol c dm³. The colorimetric methods showed higher values than the titration method, mainly for those with aluminon (up to 18.75 mmol c dm-3). The Al3+ contents of colorimetric methods correlated quadraticaly with the titration values, for the soil samples with Al3+ > 10 mmol c dm³. Among colorimetric methods, in operational terms, the eriochrome with FIA method presented analytical performance up to 50 samples per hour, easiness and sensibility for routine Al analysis in soil samples. However, due to the specificity, the titration/back-titration method should be used, despite the moroseness, when the Al3+ ions are the objective.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Exchangeable aluminum evaluation in acid soils

Abreu-Junior¹,

Muraoka

Lavorante

2003

Sci. agric. (Piracicaba, Braz.)

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“…Prunus avium L. has the potential to produce quality timber, grows well in this area and so is being considered for farm forestry and agroforestry plantings (Atkinson et al, 1988). Much of this planting is likely to occur in upland areas where soil acidity can be high and fertility marginal (Logan et al, 1985;Newbould, 1979). There is thus a need to evaluate the effect of such factors on 137 establishment as the early growth of such plantings will be critical to their ultimate success.…”

Section: Introductionmentioning

confidence: 99%

Top and root growth and nutrient absorption of Prunus avium L. at two soil pH and P levels

Neilsen

Atkinson³

1990

Plant Soil

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One-year-old Prunus avium L. were grown under greenhouse conditions in a Countesswells soil in all combinations of 2 pH and 2 P levels. The soil, obtained from a long-term liming and fertilizer experiment, provided pH values throughout the experiment of 3.75-3.99 (pH 1) and 4.81-5.41 (pH 2). The P treatments had 0.43% acetic acid extractable P of 31-44 #g g-~ (P1) and 145-173/~g g-~ (P2). The trees were harvested 92 (HI), 134 (H2), and 168 (H3) days after initiation of growth.Top (leaf + new stem) dry weight was significantly increased for pH 2 and P2 at H2 and H3. P2 also increased leaf weight (H 1), the weight of the original stem-root (H2 and H3), and root length but decreased root diameter at both soil pHs (H2 and H3). Total tree uptake of N, P, K, Ca, and Mg was also increased by pH-P combinations which had significantly greater dry matter production and root length. Total Mn uptake decreased at pH2. Root nutrient inflows (uM m-~ day-~ ) were increased for Ca at pH2 and for P at P2. Mn inflow decreased at pH2 and at pHI P2 although the increased root length associated with the latter treatment resulted in increased total tree Mn uptake. In general, high nutrient inflows occurred in all trees at H1 and in severely stunted trees at pill P1; both had larger than average root diameters.

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“…2 Experimental method Eleven soils were leached in duplicate by a manual method and a controlled flow rate method. Exchangeable acidity was measured by titration against 0.02 M NaOH (Logan et al 1985a) and exchangeable Al by coloration with Alizarin red (Logan et al 1985b).…”

Section: Effect Of Cu Interferencementioning

confidence: 99%