Hostname: page-component-cd9895bd7-jkksz Total loading time: 0 Render date: 2025-01-03T18:40:17.915Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access Rights & Permissions [Opens in a new window]

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

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

Arnold, P. W. (1962). Proa. Fertil. Soc. 72, 25–43.Google Scholar
Aslyng, H. C. (1954). Bull. Hydrotech. Lab., Copenhagen, 1–50.Google Scholar
Cooke, G. W. & Cunningham, R. K. (1958). J. Sci. Fd. Agric. 9, 324–30.CrossRefGoogle Scholar
Gasser, J. K. R. (1961). J. Sci. Fd Agric. 12, 778–84.CrossRefGoogle Scholar
Karlovsky, J. (1962). Trans. Comm. I.S.S.S. (N.Z.), iv, v, 726–33.Google Scholar
Matthews, B. C. & Beckett, P. H. T. (1962). J. Agric. Sci. 58, 59–64.CrossRefGoogle Scholar
Milton, R. F. & Buckett, J. (1953). Chem. Ind. 2, 919.Google Scholar
Schofield, R. K. (1955). Soils Fertil. 18, 373–5.Google Scholar
Smith, A. M. (1959). Proc. Fertil. Soc. 57, 40.Google Scholar
Truog, E. & Meyek, A. H. (1929). J. Ind. Engng Chem. Analyt Edn. 1, 136–9.CrossRefGoogle Scholar
Wakben, R. G. & Johnston, A. E. (1961) Rep. Rothamst. Exp. Sta. 1960, p. 45.Google Scholar
Warren, R. G.& Johnston, A. E. (1962) Rep. Rothamst. Exp. Sta. 1961, pp. 227–47.Google Scholar