ISHS Acta Horticulturae 274: International Symposium on Diagnosis of Nutritional Status of Deciduous Fruit Orchards
EFFECT OF NITROGEN RATE AND POSITION OF APPLICATION ON GROWTH AND YIELD OF APPLE TREES |
| Authors: | W. Kulesza, R.Cz. Szafranek |
| Abstract:
Most apple trees are grown in herbicide strips with grassed alleyways. Fertilizers are applied to the whole orchard. Since 60–70% of the root growth of apple trees occurs in the strip and the uptake of fertilizers is almost entirely from there (Atkinson et al., 1979; Sadowski and Piwnicka, 1983) it was decided to compare the effect of N application to the herbicide strips alone and the whole area of the McIntosh and Spartan orchard. No significant differences in the leaf N, P, K, Mg, Ca and Mn content and tree growth, fruit set, fruit yield and the fruit dry matter and sugar content were found between these two positions. The keeping quality of apples from the herbicide strip N-treated trees was lower than that of apples from the whole orchard N-treated trees. | |
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