Chemical composition of mountain birch (Betula pubescens Ehrh.), and lowland birch (Betula pendula Roth.) seedlings, grown at varying temperature, light and photoperiod

aislamiento azote betula pendula betula pubescens carbohidratos carbohydrates chlorophylle chlorophylls clorofilas crecimiento croissance duration fosforo fotoperiodismo glucide growth insulation isolation light luz nitrogen noruega norway phosphore phosphorus photoperiodicity temperatura temperature