Nach Oben

Abstract

An empirical model for describing growth and nitrogen uptake of white cabbage (Brassica oleracea var. capitata).

Field experiments with white cabbage crops (Brassica oleracea var. capitata) showed large variation in nitrogen uptake, dependent on different local climate conditions, cultivars and growing practices. Proper fertilizer recommendations should allow for these differences. For advisory purposes a simple model for nitrogen uptake was developed that can be adapted to farm specific growing conditions. Model validation was carried out with 21 data sets obtained from experiments, grower’s fields and the literature.

Using expected yield, expected duration of crop growth and planting date as input the model generated good fits to measured nitrogen uptake curves. In 56 per cent of all measurements the estimation error was within the range of ± 25 kg nitrogen ha-1 and in 90 per cent within ± 50 kg nitrogen ha-1.



Fink, M.; Feller; C. (1998) An empirical model for describing growth and nitrogen uptake of white cabbage (Brassica oleracea var. capitata). Scientia Horticulturae 73 (2/3), 75-88