deel ie lee RMTE
A. IT.
101
1 to V. V.
‘ent parts
of highest
1. Finland
ul rainfall
k produc-
oy taking
two milk
hese sam-
rom more
> factory.
represent
from »B»
Finland.
O. Paaxkoua, R. NASANEN, D. MERTEN and J. K. Miettinen, Strontium 90
5
Fug. 2. Milk received by Finnish co-operative dairies in 1958 in millions kgs and as
percent of total received (1.722 milj. kg). — Co-operative dairies represent 79.3 %
of milk received by all dairies (2.172 milj. kg).
The local milk and grass samples were taken between Aug. 29 and Sept.
6, 1959, from 8 experimental farms located between latitudes 60° and 67°N
(Table 1, Nos. 1—8) and from a private farm located at lat. 69°N (No. 9).
Experimental farms have the advantage that all data on farming, e.g. the
diet of the cattle, can be checked at any time, even later. On the experimental farms selected for the present study the soil type and pH are fairly
comparable (Table 1). The calcium status of the soil, exchangeable soil calcium as CaCQ, tons/ha in a soil stratum 20 cm deep (Table 1, last column)
is satisfactory or tolerable. Maenpaa’s farm (No. 9) is tolerable regarding pH.
but its calcium status is poor. In each case the cattle had been solely on
pasture for about three months, except for 2—3 weeks in August, when ca.
10 % additional fodder, usually cereal grown on the same farm in theprevious year, had been given because the pastures had been exhausted (the
summer of 1959 was exceptionally dry in Finland).