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5. The calcium contest of F. rubra and P. pratensis were
higher than in Phl. pratense and Al. pratensis on the same
time of the summer.
6. The calcium contents of the grasses increase in the
latter part of the summer.
7. The phosphorous contents of the grasses are higher in
the first part of the summer than in the latter.
8. The Ca/P ratio is therefore lower in the first part than
in the latter part of the summer.
9. With increasing use of N, P and K fertilizers both P
and Ca contents of the grasses increased, but the P contents
increased more.
10. The Ca contents of unfertilized peat meadow plants
are very much the same as of the grasses on the fertilized
grassland.
11. The phosphorous contents of unfertilized peat mea-
dow plants were about i/3 of the phosphorous contents of
the fertilized grassland grasses.
HEIMILDIR.
Björn Jóhannesson (1956): Ahrif áburðar og sláttutíma á eggjahvítu,
fosfór og kalsíum í íslenzku grasi. Rit Landbúnaðardeildar, B-fL, nr. 8.
Klemenz Kristjánsson (1944): Fóðurjurtir og korn. Búfræðingurinn,
XI. árg.
Sturla Friðriksson (1956): Grasa- og belgjurtategundir í íslenzkum
sáðtilraunum. Rit Landbúnaðardeildar, B-fl., nr. 9.
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