ISHS Acta Horticulturae 165: III International Symposium on Vaccinium Culture
NITROGEN SUPPLY OF HIGHBUSH BLUEBERRIES |
| Authors: | W.D. Naumann, E. Krüger |
| Abstract:
Nitrogen was applied to highbush blueberries cv. 'Berkeley' using ammonium sulphate-nitrate as well as the slow release fertilizer Crotodur. Treatments of 0 kg, 30 kg, 60 kg, 90 kg, and 120 kg N/ha were compared. The best crop yields per plant were obtained with 30 kg N/ha, whereas higher applications decreased yields. Increasing N supply induced higher N, P, and K levels in the leaves but reduced Ca and Mg contents. 1.34% – 1.46% N in the dry matter of leaves proved to be at optimum. The annual nitrogen needs of highbush blueberry plantings in their best cropping age could be calculated with 36 – 41 kg N/ha. | |
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