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Nitrogen response curves of spring barley

Published online by Cambridge University Press:  27 March 2009

P. E. Sparrow
P. E. Sparrow
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts. AL5 2JQ
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Summary

The results of 83 experiments with nine levels of nitrogen and six experiments with seven levels were used to investigate models of the response of spring barley to nitrogen. Of the eight models tested, the inverse quadratic, Greenwood's modification of the inverse linear and two intersecting straight lines represented the yield/fertilizer relationship well, although no one model fitted best at every site.

The three models differed little in their average predicted optimal yields, but a slightly smaller average optimal dressing was predicted from two straight lines.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 92 , Issue 2 , April 1979 , pp. 307 - 317
Copyright
Copyright © Cambridge University Press 1979

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References

Akaike, H. (1971). Information theory and an extension of the maximum likelihood principle. Proceedings 2nd International Symposia on Information Theory, September 2nd to 8th 1971.Google Scholar
Boyd, D. A. (1972). Some recent ideas on fertilizer response curves. Proceedings of the 9th Congress of International Potash Institute, pp. 461–473.Google Scholar
Boyd, D. A., YuenL, T. K. L, T. K. & Needham, P. (1976). Nitrogen requirement of cereals. 1. Response curves. Journal of Agricultural Science, Cambridge 87, 149–162.CrossRefGoogle Scholar
Greenwood, D. J., Wood, J. T., Cleaver, T. J. & Hunt, J. (1971). A theory for fertilizer response. Journal of Agricultural Science, Cambridge 77, 511–523.CrossRefGoogle Scholar
Hinkley, D. V. (1969). Interference about the intersection in two-phase regression. Biometrika 56, 495–504.CrossRefGoogle Scholar
Jónsson, L. (1974). On the choice of a production function model for nitrogen fertilization on small grains in Sweden. Swedish Journal of Agricultural Research 4, 87–97.Google Scholar
Ministry of Agriculture, Fisheries and Food (1973). Fertilizer recommendations. Agricultural and Horticultural Crops. Bulletin 209, LondonH.M.S.O., 102 pp.Google Scholar
Ministry of Agriculture, Fisheries and Food (1976). Manual of plant growth stages and disease assessment keys. Pinner. H.M.S.O.Google Scholar
Nelder, J. A. (1966). Inverse polynomials, a useful group of multi-factor responses. Biometrics 22, 128–141.CrossRefGoogle Scholar
Thorne, Gillian N. (1969). Physiology of grain yield. National Agricultural Advisory Service Quarterly Review, No. 85, pp. 42–46.Google Scholar