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ISHS Acta Horticulturae 607: IX International Symposium on Timing of Field Production in Vegetable Crops

GROWTH DYNAMICS AND OCCURRENCE OF CRAKCS IN KOHLRABI TUBERS (BRASSICA OLERACEA VAR. GONGYLODES L.)

Authors:   F. Lippert, E. Heuvelink, H.P. Liebig
Keywords:   expolinear model, physiological disorder, growth dynamics, growth rate
Abstract:
The long-term influence of growth patterns on the occurrence of tuber cracks of kohlrabi (Brassica oleracea var. gongylodes L.) was evaluated based on the Goudriaan-Monteith expolinear model. Its three main fitting parameters are maximum relative growth rate (rm), maximum absolute growth rate (cm) and ‘lost time’ (X intercept of the linear growth phase, tb). Only the long-term pattern tb was found to be related to the occurrence of tuber cracks, when comparing different planting dates. Therefore, the influence of environmental factors was linked to the occurrence of tuber cracks by the ‘lost time’ (tb). This suggests that the earlier the beginning of the linear phase, the higher the risk of tuber cracking.
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