Studies on soil reaction. I. A Résumé

Fisher, E. A.

doi:10.1017/s002185960000349x

Cited by 6 publications

(1 citation statement)

References 39 publications

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“…From the observed values of C at three different soil-water ratios, we have Kß Cid = - Table V shows a comparison for seven of the soils studied of the grams soil per 1000 cc of water actually employed with the quantities of soil calculated to produce the H-ion concentration observed. It was not possible to give the calculated H-ion concentration for the variable amounts of soil used, since equation (5) does not lend itself readily to the calculation of "C."…”

Section: Experimental Methodsmentioning

confidence: 99%

Factors affecting Soil Reaction. I

Salter¹,

Morgan²

1923

J. Phys. Chem.

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Section: Experimental Methodsmentioning

confidence: 99%

Factors affecting Soil Reaction. I

Salter¹,

Morgan²

1923

J. Phys. Chem.

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Studies on soil reaction: III. The determination of the hydrogenion concentration of soil suspensions by means of the hydrogen electrode

Crowther

1925

J. Agric. Sci.

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IN the two preceding papers of this series Fisher 1 gave a general re'sume' of the early work on soil reaction, and outlined the principles underlying the colorimetric method of determining the hydrogen ion concentration of soil suspensions and extracts. Considerable difficulties in the use of indicators arise with turbid soil suspensions and it would appear that the method is primarily adapted for rapid and approximate determinations, rather than for precise measurements. Very useful results can be obtained by "spotting out" small quantities of soil and indicator solution, as in Spurway's 2 ingenious method of using paraffined paper strips instead of test tubes. The indicator method of measuring hydrogen ion concentration is, of course, a useful addition to other studies on the composition of the "soil solution," as obtained by percolation methods 3 , and such measurements probably afford the most useful method of following seasonal changes in soil reaction, though the time and labour involved in the preparation of the percolates are too great to render the method of general utility.The electrometric method of measuring hydrogen ion concentration is the most fundamental and has proved the most satisfactory on almost all types of solutions and materials. It is not proposed to review here the principles underlying this method, since these are fully discussed in Clark's well-known monograph 4 . A hydrogen electrode apparatus developed in these laboratories four years ago will be briefly described and 1 E.

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Studies on soil reaction: VI. The interaction of acid soils, calcium carbonate and water, in relation to the determination of “lime requirements.”

Crowther

Martin

1925

J. Agric. Sci.

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The variations in Hutchinson-MacLennan “lime requirement” with the amount of soil and calcium bicarbonate solution are shown to be connected with the buffer action of the soil. Indirect titration curves can be derived from the calcium bicarbonate results, and show a systematic divergence from the direct electrometric titration curves, owing to the variable calcium concentration of the final bicarbonate solutions. In the presence of calcium chloride both methods show lower pH values for a given base absorption and yield almost identical titration curves. The Hutchinson-MacLennan “lime requirement” is always less than the equivalent of the amount of calcium hydroxide necessary to give a neutral suspension in the electrometric titrations. The calcium bicarbonate solutions at equilibrium are always more acid than pH 6·2, but the “salt effect” tends to give results corresponding to a somewhat higher degree of neutralisation. “Lime requirements” should be obtained by interpolation to some arbitrary concentration, and an empirical relationship is given by which the interpolation may be made from a single determination. The Hutchinson-MacLennan method can give no indication of the intensity of soil acidity, but serves to estimate the amount of lime necessary to give a considerable reduction of acidity.

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Studies on soil reaction. I. A Résumé

Cited by 6 publications

References 39 publications

Factors affecting Soil Reaction. I

Factors affecting Soil Reaction. I

Studies on soil reaction: III. The determination of the hydrogenion concentration of soil suspensions by means of the hydrogen electrode

Studies on soil reaction: VI. The interaction of acid soils, calcium carbonate and water, in relation to the determination of “lime requirements.”

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