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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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