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Field experiments on phosphate fertilizers. A joint investigation

Published online by Cambridge University Press:  27 March 2009

G. W. Cooke  and
F. V. Widdowson
G. W. Cooke
Affiliation:
Chemistry Department, Rothamsted Experimental Station, Harpenden, Herts
F. V. Widdowson
Affiliation:
Chemistry Department, Rothamsted Experimental Station, Harpenden, Herts
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Extract

The results of about ninety field experiments carried out over three years to test dicalcium phosphate, nitrophosphate, ammoniated fertilizer and Gafsa rock phosphate are summarized and discussed. Soils with pH values of 6·5 and below are listed as ‘acid’, those with higher pH values as ‘neutral’. All comparisons were made in terms of fertilizers supplying the same total amounts of phosphorus.

Dicalcium phosphate dihydrate gave approximately the same yields as superphosphate for potatoes (both on acid and on neutral soils) and for grass, kale and barley. In one group of swede experiments mostly carried out in the north-east of the country dicalcium phosphate was inferior to superphosphate, but it was equal to superphosphate in another group of swede experiments, most of which were on acid soils in wetter areas.

A nitrophosphate made in England on pilot-plant scale was consistently inferior to superphosphate for barley, potatoes and swedes.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 53 , Issue 1 , August 1959 , pp. 46 - 63
Copyright
Copyright © Cambridge University Press 1959

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References

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