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The Availability of Phosphatic Fertilisers as shown by an Examination Soil Solution and of Plant Growth1 (With Two Text-figures.)

Published online by Cambridge University Press:  27 March 2009

A. W. Greenhill
A. W. Greenhill
Affiliation:
(Formerly of the Rothamsted Experimental Station, now of the Imperial Chemical Industries, Limited, Agricultural Research Station, Jealott's Hill, Bracknell, Berks.)
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Extract

The growth of barley and the phosphate concentration of the soil solution, of the soil cropped and uncropped, were examined simultaneously in pot cultures, after treatment of an acid soil deficient in phosphate, with lime with and without slag or superphosphate.

Liming at the rate of half the lime requirement increased the concentration from about 0·7 p.p.m. P2O5 to about 1 p.p.m. and at the rate of twice the lime requirement to over 2 p.p.m. P205. Phosphates depressed the concentration on the lightly limed soils, and on the heavily limed had variable effects. The superphosphate-treated soils showed rather lower concentrations than the slag-treated. Cropping raised the concentration on the lightly limed treatments, but on the heavily limed reduced it on the control and had a variable effect on the phosphate treatments.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 20 , Issue 4 , October 1930 , pp. 559 - 572
Copyright
Copyright © Cambridge University Press 1930

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References

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