Ársrit Ræktunarfélags Norðurlands - 01.01.1968, Side 77

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12. Nils Vikeland: Lite smakelig höy pá myrjord.
Meddelelser fra det Norske Myrselskap, 1964, nr. 2,
bls. 62.
13. W. Dijkshoorn and M. L. ’T Hart: The effect of alter-
ation of temperatnre npon the cationic composition in
perennial ryegrass.
Netherlands Journal of Agricultural Science, 1956,
nr. 1, bls. 18—36.
14. K. F. Nielsen and R. K. Cunningham: The Effects of
Soil Temperature and Form and Level of Nitrogen on
Growth and Chemical Composition of Italian Ryegrass.
Soil Sci. Soc. Am. Proc., 1964, Vol. 28, No. 2, bls.
213-218.
Summary.
The mineral and protein contents of the following field plants were
estimated: Calluna vulgaris, Betula pubescens, Betula nana, Vaccinium
uliginosum, Arctostaphylos ava ursi, Empetrum nigrum, Carex rostrata
and Deschampsia caespitosa. In addition samples were taken from wet
peat soil, drained peat soil and delta soil. The samples were classified
into Cyperaceae and Gramminaceae and analyzed.
In general the mineral and protein contents were found to be low
Samples taken in July and August showed very low phosphorous con-
tents in plants, i. e. in most cases between 0,1—0,2% on dry matter;
on the other hand the mangan contents were found to be high or 135—
225 ppm on dry matter.
Samples of Deschampsia caespitosa taken in various places from sea
level and up to the height of 350 m and at a 43 km distance from the
sea were analyzed for Ca and P. Hardly any difference was found.
Cyperaceae growing in wet soil were found to be poorer in P and
protein than when growing in dry soil. Possibly this could explain the
fact that grasses growing in wet soil are not good for grazing.