THE CONTENT OF INDOLE-3-ACETIC ACID IN PINUS SYLVESTRIS L. SEEDLINGS AS INFLUENCED BY DIFFERENT NITROGEN FORMS AND LEVELS

Nitrogen fertilization significantly increases the amount of indole-3-acetic acid (IAA) in seedlings of Scots pine (Pinus sylvestris L.). The increase in the concentration of IAA depends as well on the source of nitrogen (urea, ammonium tartrate, calcium nitrate) as on the level.