Journal ArticleDOI
Extraction of potassium from some kaolinitic soils of the tropics
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In this article, three methods for soil potassium extraction (M NH4OAc pH 7, 0.01 M AgTU and 30 % hot H2SO4) were compared for a variety of kaolinitic soils of the tropics.Abstract:
Three methods for soil potassium extraction (M NH4OAc pH 7, 0.01 M AgTU and 30 % hot H2SO4) were compared for a variety of kaolinitic soils of the tropics. The AgTU‐extractable K was much higher than the M NH4OAc‐extractable K when vermiculite clay was present in the soil. The correlation between both was given by an R value of 0.937. The amounts of K extracted by 0.01 M AgTU and by hot H2SO4 were approximately the same. The R value for these two methods was 0.843. It is suggested that the AgTU extractant could be used for determination of plant‐available K in soil and for testing for the presence or absence of vermiculite clay in soils.read more
Citations
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Journal ArticleDOI
The use of a copper thiourea reagent for the determination of exchangeable basic cations in soils
TL;DR: In this paper, a procedure for the rapid determination of basic exchangeable cations in soils that uses the copper(1) complex with thiourea is described and tested, and the results obtained compared favourably with values obtained by displacement of cations with pH 8.5, 1M NH4Cl and 0.01 M silver thIourea.
References
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Book ChapterDOI
X-Ray Diffraction Techniques for Mineral Identification and Mineralogical Composition
Journal ArticleDOI
A single-extraction method using silver-thiourea for measuring exchangeable cations and effective cec in soils with variable charges
J. L. Pleysier,A. S. R. Juo +1 more
TL;DR: In this paper, the use of a single extraction with dilute unbuffered silver-thiourea (AgTU) solution (0.01 M Ag+) for measuring exchangeable cations and the cation exchange capacity (CEC) of soils was compared with the conventional effective CEC method, which used N NH4OAc displacement for exchangeable “ba
Journal ArticleDOI
Extraction of Potassium from Soils by Sulfuric Acid1
A. H. Hunter,P. F. Pratt +1 more