Nitrogen Status and Light Environment Influence Dry Matter Partitioning in Cauliflower

in Journal of the American Society for Horticultural Science
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  • 1 Institute for Vegetable and Fruit Crops, University of Hannover, 30419 Hannover, Germany

Concepts of above-ground dry matter partitioning in cauliflower [Brassica oleracea L. (Botrytis Group)] as dependent on nitrogen (N) supply and light environment are presented. Leaf and stem partitioning depends on a functional relationship between stem dry weight and leaf area, independent of N status. Dry matter partitioning into the inflorescence is sink-limited (potential capacity) at the beginning, and source limited (daily available assimilates) later. The intrinsic specific growth rate of the inflorescence is dependent on leaf N content. The model is parameterized and evaluated with data from field experiments. Applied to an independent data set, the model predictions of proportions of inflorescence, leaf, and stem on total dry matter corresponded with measurements (r = 0.84, 0.92 and 0.22, respectively) for different N fertilization rates and light treatments.

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Contributor Notes

Professor and corresponding author; e-mail: stuetzel@gem.uni-hannover.de.
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