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Potassium-releasing power of soils from the Agdell rotation experiment assessed by glasshouse cropping

Published online by Cambridge University Press:  27 March 2009

P. W. Arnold  and
B. M. Close
P. W. Arnold
Affiliation:
Chemistry Department, Rothamsted Experimental Station, Harpenden, Hertfordshire
B. M. Close
Affiliation:
Chemistry Department, Rothamsted Experimental Station, Harpenden, Hertfordshire
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Extract

1. On cropping Agdell Experiment topsoils to exhaustion with perennial rye-grass in the glasshouse the total K uptakes were directly proportional to the initial exchangeable K contents of the soils.

2. The ability of the Agdell topsoils to release non-exchangeable K under glasshouse conditions decreased in the order: PK-rotation with fallow < NPK rotation with fallow < PK-rotation with clover < NPK-rotation with clover < no-fertilizerrotation with fallow = no-fertilizer rotation with clover.

3. Releases of non-exchangeable K were at least 2·5 times larger than the falls in the exchangeable K for all the Agdell soils.

4. In a ‘take-down’ experiment in the glasshouse on a soil receiving K fertilizer each year in the Saxmundham Rotation I Experiment, loosely held non-exchangeable K was released at a near-linear rate. At least a part of the loosely held non-exchangeable K in the Agdell soils was also released at a near-linear rate.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 57 , Issue 3 , November 1961 , pp. 381 - 386
Copyright
Copyright © Cambridge University Press 1961

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References

REFERENCES

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