Z Katedry Nawożenia Roślin Ogrodniczych
Akademii Rolniczej im. Augusta Cieszkowskiego w Poznaniu
Abstract. The influence of slow-release fertilizers on growth and flowering of Delphinium grandiflorum L. grown in pots was studied. The plants supplied with Osmocote Plus 3-4 M had more of side shoots and more flowers than the plants supplied with Osmocote Plus 5-6 M. Plants supplied with Osmocote 3.5 g of fertilizer∙dm-3 substrate were the most decorative.
Key words:
Delphinium grandiflorum L., fertilization Osmocote Plus, growth, flowering
Summary
Plants of Delphinium grandiflorum ‘Blauer Spiegel’ grown in pots were supplied with Osmocote Plus 3-4 months release and 5-6 months release at amounts: 1.5; 2.5; 3.5 g∙dm-3 of substrate. The influence of type and doses of fertilizer were estimated by biometrical measurements at full blossoming. The contents of macro- and microcomponents were indicated in average substrate and leaves samples.
The use of Osmocote Plus 3-4 M for Delphinium grandiflorum resulted in plants of higher number of longer side shoots and more flowers than in case of Osmocote 5-6 M. Plants supplied with Osmocote 3.5 g∙dm-3 substrate were the most decorative. At this dose the content of nitrogen – total in leaves was 2.25-2.79% and potassium 3.41-3.46%.