The effects of excess nitrogen deposition on young Norway spruce trees. Part II. The vegetation

acid deposition acidification aluminio aluminium ammonia ammoniac ammonium azote chemical composition composition chimique deficiency diseases fer foliage forest decline forest health forest pathology fosforo hierro iron magnesio magnesium maladie de carence nitrogen nutrient deficiencies nutrition des plantes phosphore phosphorus picea abies plant nutrition pollution pot experimentation potasio potassium