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Improvement of spruce (Picea abies) plantations. A sociological approach


, : Improvement of spruce (Picea abies) plantations. A sociological approach. Annales de Recherches Sylvicoles 1978, AFOCEL, France, Tome 2: 352-401

Two fertilizer trials and 2 thinning trials were begun in 1973 in Norway spruce plantations in eastern France. The object was to analyse the results by 'sociological' classes (approximately identified with girth classes). For each 5 cm class measurements were recorded of mean girth (not necessarily the mid point of the class), b.a., girth increment and b.a. increment.

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