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Seasonal changes in the amounts of phosphorus and potassium dissolved from soils by dilute calcium chloride solutions

Published online by Cambridge University Press:  27 March 2009

M. Blakemore
M. Blakemore
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts
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Extract

Variations during 12 months in the concentrations of soil P and K soluble in 0-01M CaCl2 solution were measured on several sites with contrasted histories at both Rothamsted and Woburn. Concentrations were always less in fresh than in airdried soils.

P concentrations in the heavy soils at Rothamsted were remarkably constant, seasonal variation only occurring where FYM or phosphate fertilizers had been applied during the year. At Woburn P concentrations were also constant in the poorer soils, but varied during the year in rich soils.

On Barnfield at Rothamsted the plots receiving FYM each year contained more soluble P than those treated with superphosphate. Where both FYM and superphosphate were applied, P concentrations were greater than the sum of values on plots receiving FYM and superphosphate separately because a given amount of P remained more soluble when FYM was regularly applied. P also remained more soluble on plots given ammonium sulphate.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 66 , Issue 1 , February 1966 , pp. 139 - 146
Copyright
Copyright © Cambridge University Press 1966

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References

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