Fjölrit RALA - 15.08.1980, Side 29

17
Pasture ident. Live- stock Pasture treatment Grazing pressure Pastur size, ha e Number of livestock Pasture ident.
Ewes Lambs Horses
110 Sheep Unferti- Light 6.8 9 12 110
120 lized Medium 4.5 11 22 120
130 ii " Heavy 2.2 8 16 130
140 ii Ferti- Light 1.7 6 12 140
150 ii lized Medium í.i 6 12 150
160 ii " Heavy 0.6 5 10 160
210 Sheep Unferti- Light 10.5 4 8 3 210
220 and lized Medium 7.0 6 12 3 220
230 Horses " Heavy 3.5 4 18 2 230
240 " Ferti- Light 2.6 5 10 2 240
250 " lized Medium 1.8 4 8 3 250
260 " " Heavy 0.9 4 8 2 260
510 Horses Unferti- Light 6.8 3 510
520 " lized Medium 4.5 4 520
5 30 " " Heavy 2.2 3 530
540 " Ferti- Light. 1.7 2 540
550 " lized Medium 1.1 3 550
560 " " Heavy 0.6 2 560
181 Sheep Unferti- On a common 8 16 181
182 " lized range 0 18 182
Procedure: The experiment started 25 . June and ended 24. Sept In the
experiment there were 89 ewes with twins and 32 horses. The same
number of lambs were of each sex.
Experimental animals: The sheep were from the farm Kalfholt and the horses
from the farms Kirkjubær and Gunnarsholt.
VI. KELDUHVERFI IN THINGEYJARSYSLA IN NORTH ICELAND.
Person in charge: Grimur Jonsson.
Livestock supervision: Adam Jonsson, Tovegg.
Fencing supervision; Sveinn Thorarinsson, LR., Krossdal.
Experimental site: The altitude of the experiment is approximately 170 m
above sea level. It is on dry silt loam soil on porous lava covered with
large hummocks. The land tilts slightly eastward with many clefts and
crevices. In the fertilized pastures the proportion of grasses has increased
greatly. The grasses have reached dominance in the pastures where the shrubs
were removed with herbicide and/or fertilized.
Vegetation: The dominating species of vegetation at the beginning of the
experiment are shown on next page. Otherv/ise the 1976, Progress Report can
be referred to (Fjölrit RALA nr. 29).