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The seasonal distribution of nitrogen fertilizer dressings on pure perennial ryegrass swards

Published online by Cambridge University Press:  27 March 2009

D. Reid
D. Reid
Affiliation:
The Hannah Research Institute, Ayr
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Summary

In studies of the seasonal distribution of nitrogen fertilizer dressings on grassland using conventional experimental designs it is usually not possible to separate the true effects of an individual fertilizer dressing on the yield at a particular cut from the residual effects of previous dressings. An experiment is described which was designed to allow separation of the direct and residual effects, with certain restrictions, for a system involving five cuts and five possible fertilizer dressings per season on perennial ryegrass swards. From the results obtained over two harvest years on swards on two adjacent sites equations were derived relating the dry-matter and crude-protein yields of herbage to the rate of nitrogen application at five dressings in the season. Predictions of yield distribution patterns from the equations are compared with observed yields from various sequences of nitrogen dressings included in previous experiments at this Institute. Examples are also given of the prediction of sequences of nitrogen dressings required to obtain certain patterns of yield distribution.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 103 , Issue 3 , December 1984 , pp. 659 - 669
Copyright
Copyright © Cambridge University Press 1984

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References

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