ISHS Acta Horticulturae 221: Symposium on Horticultural Substrates and their Analysis
N-STATUS OF POT PLANTS AS EVALUATED BY MEASUREMENT OF SUBSTRATE AND PLANT SAP NITRATE |
| Author: | M.K. Schenk |
| DOI: | 10.17660/ActaHortic.1988.221.27 |
| Abstract:
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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