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Nitrogen requirement of cereals: 2. Multi-level nitrogen tests with spring barley in south-western England

Published online by Cambridge University Press:  27 March 2009

P. Needham  and
D. A. Boyd
P. Needham
Affiliation:
A.D.A.S., Cambridge
D. A. Boyd
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts.
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Summary

Seventeen experiments with spring barley testing seven amounts of nitrogen were made on commercial farms in Somerset, Devon and Cornwall between 1965 and 1968. Crop measurements and determinable site factors were only partially successful in accounting for differences between sites and between years in optimal N and efficiency of N use below optimum.

The actual optima were found to differ considerably from predicted N requirements based on past cropping and summer rainfall.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 87 , Issue 1 , August 1976 , pp. 163 - 170
Copyright
Copyright © Cambridge University Press 1976

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References

Boyd, D. A., Yuen, , Lowsing, T. K. & Needham, P. (1976). Nitrogen requirement of cereals. 1. Response curves. Journal of Agricultural Science, Cambridge 87, 149–62.CrossRefGoogle Scholar
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Salter, P. J. & Williams, J. B. (1969). The influence of texture on the moisture characteristics of soil. V. Relationships between particle-size composition and moisture contents at the upper and lower limits of available-water. Journal of Soil Science 20, 126–31.CrossRefGoogle Scholar