ISHS Acta Horticulturae 636: XXVI International Horticultural Congress: Key Processes in the Growth and Cropping of Deciduous Fruit and Nut Trees
INFLUENCE OF FERTIGATION WITH NITROGEN ON GROWTH AND CROPPING OF 'JONAGOLD' APPLE TREES |
| Authors: | Z. Cmelik, S. Tojnko |
| Keywords: | Malus x domestica, mineral nutrition, trunk cross sectional area, yield efficiency, alternate bearing |
| Abstract:
The trial was conducted in a ‘Jonagold’/M9 orchard (2500 trees/ha) and the experiment was designed as a split-block comprising five treatments (fertigation with 45 kg N/ha, 60 kg N/ha, 120 kg N/ha, irrigation without fertilisers, and control - without irrigation and without fertilisers). The treatments were imposed beginning in the second year after planting and lasted seven years (1992-1998). Fertigation with different amounts of nitrogen had no consistent effect on tree growth, cumulative yield and yield efficiency, however, treatments had a significant influence on regularity of bearing. The index of alternate bearing varied with treatment. However, these results demonstrated that the natural tendency of ‘Jonagold’ to alternate bearing could not be broken sufficiently by the different rates of nitrogen applied by fertigation. | |
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