Íslenskar landbúnaðarrannsóknir - 01.09.1969, Side 88

86 ÍSLENZKAR LANDBUNAÐARRANNSÓKNIR
consistently during tlie grazing period. The calcium content rose and the
phosphorus content fell during the same time. The phosphorus content in the
grass from the uncultivated pasture was very low, only occasionally exceeding
0.2 per cent of dry matter.
HEIMILDARRIT
REFEREN CES
Goulden, C. H, 1957: Methods of Statistical
Analysis. 2nd edit. New York, fohn Wiley
& Sons, Inc, London, Chapman & Hall,
Limited.
JÓHANNESSON, Björn, 1961: Um nýtingu fos-
fóráburðar við grasrækt og nítratmagn í
grasi og fóðurkáli. The utilization of plios-
phorus in pot experiments and field trials
and nitrate content in grass and marrow-
kale. Atvinnudeild Háskólans. Rit land-
búnaðardeildar, B-flokkur Nr. 16, Univ.
Res. Inst. Dept. of Agric., Reports. Series
B No. 16,
JÓNSSON, Kristinn og Adalsteinsson, Stef-
án, 1961: Tilraunir með hagnýtingu rækt-
aðs beitilands handa mjólkurkúm. Experi-
ments on utilization of cultivated pasture
for dairy cows. Atvinnudeild Háskólans.
Rit landbúnaðardeildar. A-flokkur Nr. 14.
Univ. Res. Inst. Dept. of Agric., Reports.
Series A No. 14.
ÞORSTEINSSON, Ingvi Og SlGURBJÖRNSSON,
Björn, 1961: Aburðarathuganir á Biskups-
tungnaafrétti. Arbók landbúnaðarins, 1.