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The available phosphate in soils

Published online by Cambridge University Press:  27 March 2009

Ernest Vanstone
Ernest Vanstone
Affiliation:
(Seale Hayne Agricultural College, Newton Abbot.)
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Extract

In the official methods of soil analysis followed in this country, the available phosphate is determined by Dyer's (1) method. This consists in determining the amount of phosphoric acid, which becomes soluble, when 200 gm. of soil are shaken continuously for 24 hours with 2 litres of water, containing 20 gm. of citric acid. The result is expressed as a percentage of the weight of soil. It is usual to infer lack of available phosphate if less than 0·01 per cent. P2O5 becomes soluble under these conditions. Hall (2) has suggested the necessity for a revision of this limit.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 15 , Issue 4 , October 1925 , pp. 460 - 465
Copyright
Copyright © Cambridge University Press 1925

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References

REFERENCES

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