Fjölrit RALA - 15.08.1980, Side 24

12
runs through the most westerly section of the experiment and along
the brook the land is rather moist, expecially pasture 111. The
vegetation type is a moss heat with low-growing shrubs and grasses.
Grasses have reached dominance in the fertilized pastures.
Vegetation: The dominating species of vegetation at the beginning of the
experiment are shown below. Otherwise the 1976 Progress Report can
be referred to (Fjölrit RALA nr. 29).
Percentage frequency
Pasture number Overall mean
111-112 121-122 131-132
Mos s-Rhacomit ri um 60. 1 60.0 59.6 59.9
Lichenes 27.9 40.0 38.4 34.4
Festuca spp. 25.3 26.7 19.8 24.1
Betula nana 11.8 12.1 1 1.8 11.9
Experimental design: The experimental design is shown in the table below
and the site diagram on figure 3.
Pasture Live- Pasture Grazing Pasture Number of Pasture
treat-
ident. stock ment pressure ha Ewes Lambs ident.
111 Sheep Unferti- Light 54.0 8 12 íii
112 lized Light 54.0 8 12 112
121 " Medium 36.0 12 20 121
122 " Medium 36.0 12 20 122
131 " Heavy 18.0 10 16 131
132 " Heavy 18.0 10 16 132
141 Ferti- Light 10.8 9 14 141
142 lized Light 10.8 9 14 142
151 " Medium 7.2 12 20 151
152 " Medium 7.2 12 20 152
161 " Heavy 3.6 10 16 161
162 " Heavy 3.6 10 16 162
181 Unferti- Free on 10 16 181
1R2 lized common range 10 16 182
Procedure: The experiment started 20. July and was continued until 12.
Sept. There were 142 ewes in the experiment, 86 had twins and 56
single lambs. The same number of lambs were of each sex.
Experimental animals: The sheep were from the farm Holt in Svinavatnshreppur.