Hostname: page-component-78c5997874-s2hrs Total loading time: 0 Render date: 2024-11-04T19:49:55.687Z Has data issue: false hasContentIssue false

The available phosphate in soils

Published online by Cambridge University Press:  27 March 2009

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

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
Copyright
Copyright © Cambridge University Press 1925

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

(1)Dyer, . J. Chem. Soc. 1894, 115.CrossRefGoogle Scholar
(2)Hall, . J. Chem. Soc. 1902, 117.CrossRefGoogle Scholar
(3)Wood, and Berry, . J. Agric. Sci. 1, 1, 116.Google Scholar
(4)Hall, and Russell, . Agric. and Soils of Kent, Surrey and Sussex, 186, 187.Google Scholar
(5)Lemmermann, . Landw. Versuchs Stat. 1921, 98, 155.Google Scholar
(6)André, and Copaux, . Bull, de la Soc. Chim. 4, XXXV, 1113.Google Scholar
(7)Dehèrain., Traité de Chimie Agricole, 525.Google Scholar
(8)Stoddart, . Wis. Agric. Expt. Station, Report, 1906, 172.Google Scholar
(9)Hall, . J. Agric. 1, 1, 85.Google Scholar
(10)Hall, and Russell, . Agric. and Soils of Kent, Surrey and Sussex, p. 191.Google Scholar