ISHS Acta Horticulturae 383: Mineral Nutrition of Deciduous Fruit Plants
THE RESPONSE OF BRAMLEY'S SEEDLING APPLE TREES TO SOIL AND FOLIAR APPLIED NITROGEN |
| Authors: | M.J. Marks, A. Clarke |
| Keywords: | Leaf N, fruit N, soil mineral nitrogen, urea, yield, apple, foliar fertilisation |
| Abstract:
Four rates of soil applied nitrogen and a foliar urea treatment were applied to four established orchards of Bramley's Seedling apple trees grown on a range of rootstocks. The experiments were conducted for a period of three years. Crop yield response to nitrogen was related to leaf nitrogen concentration but not to soil mineral nitrogen content at the beginning and end of the growing season. Foliar urea was very effective at increasing leaf and fruit nitrogen concentrations but had a variable effect upon crop yield. The poor yield response to foliar urea occurred in a year when fruit set was reduced by late frosts. Soil mineral nitrogen measurements in the autumn indicated similar residues of mineral nitrogen from 60 kg/ha N applied to the soil and the same rate applied to the foliage. | |
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