|Author: ||M.K. Schenk|
N-Status of Begonia - Elatior - Hybr., Cyclamen pers. and Saintpaulia ion. supplied by fertigation could not be determined by substrate analysis.
Optimum growth as well as N-deficiency were observed at 10–15 mg N/1 substrate.
Nitrate content in petiole press sap reflected N-supply of cyclamen and saintpaulias.
For begonias, however, nitrate content of petiole sap didn't vary significantly with N-supply because the nitrate concentration was below 200 ppm.
This could be related to a high nitrate reductase activity in the root.
The nitrate concentration in petiole press sap was hardly influenced by the NO3 : NH4 ratio of the fertigation.
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