Effect of ammonium and nitrate source of nitrogen on productivity of photosynthesis in Scots pine (Pinus silvestris L.) seedlings

Abstract

Water culture and sand culture seedlings of Scots pine were investigated in respect to their reaction to ammonium or nitrate source of nitrogen nutrition. Photosynthesis, respiration, and dry matter production were studied in three and four months old plants. The results are preliminary but they have indicated that the effect of various form of nitrogen nutrition on gas exchange and growth rates could change during the growing season.