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Residual effects of potassium fertilizer

Published online by Cambridge University Press:  27 March 2009

W. J. Ridgman  and
J. L. Jones
W. J. Ridgman
Affiliation:
Department of Applied Biology, Pembroke Street, Cambridge
J. L. Jones
Affiliation:
Cambridge University Farm, Huntingdon Road, Cambridge
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Extract

In a long-term experiment on a boulder-clay soil Ralph & Ridgman (1981) found that the response of potatoes to freshly applied K fertilizer was independent of the amount of K that had been applied during the preceding 10 years. The greatest yield was obtained from plots which had received the greatest amount of K during the preceding 10 years together with the optimum amount of freshly applied K (120 kg K/ha in this case) and the addition of an extra 60 kg K/ha to plots which had received less K previously did not increase the yield. Similar benefits from residual K had been reported by Johnston, Warren & Penny (1970). In view of the continuing disagreement about the need for applying K to cereals on boulder-clay soils it was decided to attempt to quantify these effects more precisely.

Type
Short Note
Information
The Journal of Agricultural Science , Volume 106 , Issue 1 , February 1986 , pp. 205 - 207
Copyright
Copyright © Cambridge University Press 1986

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References

REFERENCES

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Ministry of Agriculture, Fisheries and Food (1973). The analysis of agricultural materials. Technical Bulletin, Ministry of Agriculture, Fisheries and Food, No. 27.Google Scholar
Ralph, R. L. & Ridgman, W. J. (1981). A study of the effects of potassium fertilizer with special reference to wheat on boulder-clay soils. Journal of Agricultural Science, Cambridge 97, 261–296.CrossRefGoogle Scholar
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