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The potassium Q/l relationships of soils given different K manuring

Published online by Cambridge University Press:  27 March 2009

T. M. Addiscott
T. M. Addiscott
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts.
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Summary

The potassium quantity/intensity (Q/I) relationships, which relate change in exchangeable K content (Q) to change in activity ratio were measured in soil samples from manuring experiments at Rothamsted and Woburn. Within each experiment, Q/I curves for different K-manuring treatments were super-imposable on each other and on the curve relating exchangeable K to Io, the activity ratio at which the soil neither gains nor loses K. The distances on the Q axis between the curves were equal to the differences in exchangeable K.

The buffer capacity, dQ/dI, was related to the K saturation of the cation exchange capacity (CEC) by the equations

(Q and CEC in m-equiv/100 g)

Broadbalk and Hoosfield soil, and

for Barnfield soils (b= 3·08; m= 1·0) and for Woburn market garden soils (b =2·41; m= 0·6) but for soils from other Woburn experiments, dQ/dl did not vary significantly with Q/CEC.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 74 , Issue 1 , February 1970 , pp. 131 - 137
Copyright
Copyright © Cambridge University Press 1970

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References

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