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12
d m
use of the herbage prductioll an U s
by heavy intedttent cGopping
area
iii) h~avior use of the uni~roved area especially ahrig
the sumer (~adie, Arnatrong Bc Wxmell, q973);
This approach allovis m h heavier overall stocking with sheep
and some cattle. The latter are less selective in their
grazing thm sheep an& they c ontrol and reduce the coarser
herbage species (Fenton, 1937). In field trials, mimd
grazing has led to a higher output of sheep flesh plus a
bonus of some cattle flesh (i'iamop, 1965) and my therefore
be desirable on oconornic zs well as ecological grounds.
In the Lake District, although the H.F.R.O.'s proposals have
not been put into practice to any sppmciable extent,
improvement a d 'nore efficient use of the lomr altitude
grazing3 with better soils is favoured. In particular,
the use of herbicides such as asulam for bracken is being
tried. Soil changes resulting from such treatment s and fion
associated practices, such ns reseeding and stockin& with
oatt le, are currently undescribed,
01 Removal of nutrients from the ~yst en in the animal crop
Several authors have calculated removal of nutrients in the
hi11 sheep crop per unit area per year. Comparable data for
hill cattle do not appear to be available although Dean et al;,
(1 975) calcuated removal of' nitrogen fron a short-grass
prairie in northern Colorado by yearling Herefod heifera
dang June-August Tho two grazing intensities used, 0.1 1
and 0.37' - 0.48 animals ha1, are af a similar order Qo t hose
found on British bill grazings and they led to N removall over
.
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the three nanf;hs of mepsct ively 59.2 kg and 4 5 -4 kg 100 ha