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A RAPID METHOD FOR OBTAINING READILY SOLUBLE PHOSPHATES AND PHOSPHATE FIXATION IN SOILS
B. E. BEATER
Plant and Soil
Vol. 1, No. 3 (January 1949), pp. 215-220
Published by: Springer
Stable URL: http://www.jstor.org/stable/42931521
Page Count: 6
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Following well known methods for the preparation of reagents for the determination of phosphates by the coeruleo-molybdate reaction, the preparation of a new series of colour standards is detailed. The procedure for estimating phosphate by a rapid technique is given and discussed, important points being ratio of extracting solution to soil, time of reaction and temperature of reaction. The development of the blue colour is otherwise carried out in the recognised manner. After the extraction of phosphates from the soil, the amount fixed from a phosphate solution in the presence of the same extracting solution by a further sample of the soil of the same weight is next determined, using the same technique. From these two results, the readily soluble phosphate in the soil and the fixation rate are arrived at. Tentative ranges and symbols are given for readily soluble phosphate in lbs per acre, and also for the fixation rate in lbs per acre.
Plant and Soil © 1949 Springer