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A note on the effect of sheep grazing on the yield of grass swards

Published online by Cambridge University Press:  27 March 2009

I. R. Richards ,
K. M. Wolton  and
J. D. Ivins
I. R. Richards
Affiliation:
Fisona Limited, Fertilizer Division, North Wyke Experimental Station, Okehampton, Devonf-p2†
K. M. Wolton
Affiliation:
Fisona Limited, Fertilizer Division, North Wyke Experimental Station, Okehampton, Devonf-p2†
J. D. Ivins
Affiliation:
Fisona Limited, Fertilizer Division, North Wyke Experimental Station, Okehampton, Devonf-p2†
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Extract

Herbage yield obtained from grass swards is influenced by the presence of grazing animals (Brockman, Rope & Stevens, 1971a, b; Holmes, 1968; Shaw, Brockman & Wolton, 1966). The net effect of grazing in a particular situation depends on the balance between the effects of excretal-N return, which tends to increase yields (Brockman & Wolton, 1963) and those of treading and other sward damage, which tend to reduce yields (Edmond, 1970). This net grazing effect on yield can be measured by comparing yields of cut and grazed swards under management that is in all other respects identical (Shaw et al. 1966). Available data have been examined to obtain quantitative estimates of the net effect of grazing and of the changes in these effects that occur with changes in sward N supply.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 87 , Issue 2 , October 1976 , pp. 337 - 340
Copyright
Copyright © Cambridge University Press 1976

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References

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