Effects of NO3-,
NH4+, and Florovit on growth
of apple trees during a few years after planting
Kazimierz Nosal, Władysław Poniedziałek, Stanisław Porębski, Przemysław Banach
Department of Pomology
Faculty of Horticulture, University of Agriculture in Kraków
29 Listopada 54, 31-425 Kraków, Poland
In 2000-2002 an investigation was carried out on the effect of two
forms of nitrogen (NO3-
and NH4+) and Florovit on flower bud
setting and beginning of the fruiting period in apple trees.
Contrary to earlier reports, no differentiated effect of the two
nitrogen forms could be assessed in flower bud setting, fruit
bearing, or in the growth of trees. The content of nitrogen in
leaves increased only in 2001 after the application of nitrogen in
the form of NH4+. The two nitrogen
forms effected a decrease in
the content of potassium in leaves while the ammonium form also
reduced the content of potassium in them. The ammonium form of
nitrogen increased and the nitrate form decreased the pH of fruit
juice and also increased the acidity of the juice.
Nosal K., Poniedziałek W., Porębski S., Banach P., 2003. Effects
NH4+, and Florovit on growth of
apple trees during a few years after planting. Folia Horticulturae 15/2: 117-123.