ISHS Acta Horticulturae 364: V International Rhododendron Conference
NUTRIENT SUPPLY OF MICRO-PROPAGATED RHODODENDRON HYBRIDS UNDER GREENHOUSE CONDITIONS |
| Author: | H.H. Witt |
| Keywords: | Container culture, fungi infestation |
| Abstract:
Micropropagated Rhododendron varieties were potted in march in containers and then set up in a greenhouse. The young plants were initially pinched to 3 or 6 residual buds in early april. Nutrient solutions with complete fertilizer were given weekly at different concentrations from 1,2–4 g/plant from june until september. Optimum N-supply was found with 1 g N per plant (3 buds) and less than 2 g N per plant (6 buds). Higher N-levels led to disease by the fungi Phytophthora. Plant size was drastically reduced by concentrations beyond 2 g/plant. Plant quality at optimum nutrient supply can be described as another new product: plants have a 20–30 cm diameter, full budded in september and can be cooled until forcing beginning in december. | |
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