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A comparison of the yield responses of four grasses to a wide range of nitrogen application rates

Published online by Cambridge University Press:  27 March 2009

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

The yield results are reported for an experiment in which 21 rates of nitrogen fertilizer were applied on pure-sown swards of four grasses, S. 24 and Barvestra perennial ryegrass, S. 37 cocksfoot and S. 53 meadow fescue. Growth curves fitted to the herbage yield data for each grass in each year are presented. On average the total dry-matter yield curves for the two ryegrasses were similar to one another, but showed a slightly smaller response to nitrogen rates below 300 kg/ha than did S. 23 ryegrass in an earlier experiment, and a more rapid decrease in response at higher rates. S. 37 cocksfoot had a similar dry-matter yield response to the ryegrasses at the low nitrogen rates, but the response decreased more rapidly at nitrogen rates over 250 kg/ha. The dry-matter yield response of S. 53 fescue decreased even more rapidly with nitrogen rates over 200 kg/ha. The mean estimates of the optimal nitrogen rate for each of the four grasses, i.e. the nitrogen rate at which the dry-matter response had decreased to 10 kg/kg N, was 380, 372, 357 and 327 kg N/ha for S. 24, Barvestra, S. 37 and S. 53 respectively, compared with 409 kg/ha for S. 23 ryegrass in the earlier experiment.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 105 , Issue 2 , October 1985 , pp. 381 - 387
Copyright
Copyright © Cambridge University Press 1985

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References

REFERENCES

Alvey, N. G. et al. (1983). Genstat. A general statistical program. Oxford: Numerical Algorithms Group Ltd.Google Scholar
Lee, G. R., Davies, L. H., Armitage, E. R. & Hood, A. E. M. (1977). The effects of rates of nitrogen application on seven perennial ryegrass varieties. Journal of the British Grassland Society 32, 83–87.CrossRefGoogle Scholar
Reid, D. (1970). The effects of a wide range of nitrogen rates on the yields from a perennial ryegrass sward with and without white clover. Journal of Agricultural Science, Cambridge 74, 227–240.CrossRefGoogle Scholar
Reid, D. (1972). The effects of the long-term application of a wide range of nitrogen rates on the yields from a perennial ryegrass sward with and without white clover. Journal of Agricultural Science, Cambridge 79, 291–301.CrossRefGoogle Scholar
Reid, D. (1978). The effects of frequency of defoliation on the yield response of a perennial ryegrass sward to a wide range of nitrogen application rates. Journal of Agricultural Science, Cambridge 90, 447–457.CrossRefGoogle Scholar
Sparrow, P. E. (1979). The comparison of five response curves for representing the relationship between the annual dry-matter yield of grass herbage and fertilizer nitrogen. Journal of Agricultural Science, Cambridge 93, 513–520.CrossRefGoogle Scholar