1. 1
   Mycorrhiza and tree nutrition in poor forest soils. Mykorrhiza och näringsupptagning hos skogsträd i mager skogsjord

   by Björkman, Erik, 1912-
   Published 1970

   Stockholm, Royal College of Forestry, 1970.

   24 p. illus. 25 cm.

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2. 2
   Observation phénologiques et morphologiques sur le comportement de quelques essences forestières soumises à l'action des engrais N, P et K

   by Pineau, Marius
   Published 1968

   Zürich, Bühler, 1968.

   136 p. illus.

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3. 3
   Effects of tree species and nutrient application on distribution and budgets of base cations in Swedish forest ecosystems

   by Eriksson, Hillevi M.
   Published 1996

   Uppsala : Swedish University of Agricultural Sciences, 1996.

   1 v. (various pagings) : ill., map ; 24 cm.

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