NUTRIENT SUPPLY OF MICRO-PROPAGATED RHODODENDRON HYBRIDS UNDER GREENHOUSE CONDITIONS
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.