Ársrit Ræktunarfélags Norðurlands - 01.01.1965, Page 82

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Reykhólar. Possible causes to the differences mentioned are discussed
and it is pointed out that the experiment was started on a recently
drained peat soil at Reykhólar, but on an old grass field in Akureyri,
furthermore the yield on the same experimental plots in Reykhólar
has been increasing during the years, also where no nitrogen is applied,
but in Akureyri the yield has maintained at approximately the same
level with irregular yearly variations. It is concluded, that the cultiva-
tion of the peat soil in Reykhólar may have caused a nitrogen release
from the soil, and this nitrogen release may be the main cause to the
higher yield in Reykhólar and to the differences discussed in the amino
acid content and composition of the crude protein of the samples from
the two experimental sites.
In the last part of the article (2c), the amino acid content of other
feeds and to the amino acid requirement of chickens and pigs. It is
concluded, that grassmeal is just as well suited in all mash feed, as
wheat bran and maize when the amino acid content is concerned.
Acknowledgement.
Grateful acknowledgement is made to prof. dr. agro. F. Steenbjerg
for his kind permission to carry out the analysis at the Department of
Soil Fertility and Plant Nutrition, The Royal Veterinary and Agricul-
tural College, Copenhagen. My grateful thanks are also due to mag.
scient. Ivan Larsen for skillful guidance during the course of the ana-
lysis work and to the Chief Adviser for pig and poultry farming in Ice-
land, agronom Gunnar Bjarnason for his helpful interest in this work.
The help given by the Agricultural Department of the University Re-
search Institute in Reykjavik and the Agricultural College at Hvann-
eyri, Iceland is greatly appreciated.