ISHS Acta Horticulturae 185: I International Protea Research Symposium
A PRELIMINARY STUDY OF INTERACTIONS BETWEEN NITROGEN, POTASSIUM AND PHOSPHORUS IN THE MINERAL NUTRITION OF SEEDLINGS OF LEUCADENDRON SALIGNUM BERG. (PROTEACEAE). |
| Authors: | R.D. Heinsohn, N.W. Panmenter |
| Abstract:
The ammonium nitrogen, nitrate/ammonium nitrogen, potassium and phosphorus mineral nutrition of Leucadendron salignum Berg. (Proteaceae) seedlings in water culture were investigated by monitoring their growth and nutrient levels under varying concentrations of supplied nutrients. Ammonium nitrogen supplied in relatively high levels promoted growth, nitrate nitrogen at high levels was toxic, and optimum growth occurred at intermediate potassium and phosphorus concentrations. Interesting interactions were also found and are discussed. Despite the preliminary nature of the studies, in view of large amounts of material lost during bloom harvesting, the fertilisation of cultivated proteas is recommended. | |
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