ISHS Acta Horticulturae 339: Workshop on Ecological Aspects of Vegetable Fertilization in Integrated Crop Production in the Field
EFFECTS OF NITROGEN AVAILABILITY ON CROP GROWTH AND NITROGEN UPTAKE OF BRUSSELS SPROUTS AND LEEK |
| Authors: | R. Booij, C.T. Enserink, A.L. Smit, A. van der Werf |
| Keywords: | Allium porrum L., Brassica oleracea L. var. gemmifera, nitrogen balance, Nmin, N-uptake, relative growth-rate, soil mineral nitrogen |
| Abstract:
Dry matter production, nitrogen uptake and changes in soil mineral nitrogen during crop growth of leek and Brussels sprouts were studied in a field trial, at different levels of nitrogen fertilizer. Dry matter production of Brussels sprouts increased with increasing nitrogen availability and maximum dry matter production was reached at 200 kg N ha-1. Nitrogen uptake increased linearly with nitrogen rates up to 300 kg N ha-1. Apparent nitrogen recovery was over 90 % and was independent of the amount of nitrogen applied. Total dry matter production of leek was lower and maximum dry matter production was reached at 125 kg N ha-1, apparent nitrogen recovery was 90 % at this rate, but at a rate of 250 kg N ha-1 the apparent nitrogen recovery was 51%. | |
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