ISHS Acta Horticulturae 185: I International Protea Research Symposium
SOME ASPECTS OF THE NUTRITION OF PROTEAS |
| Author: | A.S. Claassens |
| Abstract:
Several protea species were grown in sand cultures where the influence of salt concentration, N, P, K and Na supply and N source on their growth and nutrient uptake were studied. Nutrients were supplied by means of a half strength Hoagland nutrient solution modified to supply N mainly as NH4. Species differences in response to the treatments were observed and these differences were also found for a single species from different localities. The largest differences were obtained by varying the N supply. Some species did not grow well with NO3 only while all did well with NH4 only. Relatively high concentrations of NH4 could be tolerated. With the addition of Na to the nutrient solution even higher NH4 concentrations could be tolerated. All species were sensitive to high P concentrations. Relatively high total salt concentrations could be tolerated if the P concentration was within acceptable limits. Relatively low concentrations of the various nutrients are required for normal growth. | |
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