Friesia X, 4-5
Friesia X, 4-5
Friesia X, 4-5
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Fig. 2. The soil borer used for colleeting soil samples.<br />
JOHS. JØRGENSEN phat.<br />
The interest for the ecological demands of C. geophilum and for<br />
the significance of various factors for the mycorrhiza-formation has<br />
implicated several growth tests on artificial substratum (MELIN &<br />
NYMAN 1940, LIHNELL 1942, MELIN & NORKRANS 1942, MELIN &<br />
MIKOLA 1948, MIKOLA 1948a, HACSKAYLO 1961, SANTORO & CASIDA<br />
1962, HACSKAYLO et al. 1965 , TRAPPE 1969).<br />
MATERlALS AND METHODS<br />
Collection of samples, separation and determination of sclerotia<br />
During the period 1/8 - 3/9 1964 soil samples were collected from<br />
57 fields on Funen and particularly in Jutland (cf. Fig. 1) for<br />
examination of the seed content. Twenty fields were grown with root<br />
crops (cf. Fig. 1, Nos. 1-20) and 37 with cereals (Fig. 1, Nos. 21-57).<br />
Within an area of 40-50 m 2 30 soil samples were taken with a borer<br />
(cf. Fig. 2), which removed a circular soil column of 9.9 cm- X 20 cm.<br />
The soil samples were air-dried, mixed and divided into six portions.<br />
One portion was washed at a Fenwick washing apparatus, where the<br />
fine sieve retained particles larger than 0.14 mm. These particles were<br />
then examined for content of seed (cf. JENSEN 1969).