Z Katedry Nawożenia Roślin Ogrodniczych
Akademii Rolniczej im. Augusta Cieszkowskiego w Poznaniu
Abstract. The effect of nitrogen and potassium fertilization on the growth and flowering of perennial plants was studied in two species grown in pots. The values of the investigated features significantly increased under the influence of increasing amounts of nitrogen in the substrate, but they did not depend on the doses of potassium.
Key words:
perennials, fertilization, nitrogen, potassium
Summary
The objective of the studies was the determination of the effect of nitrogen and potassium fertilization on the growth and flowering of two perennial plant species grown in pots. Three different doses of nitrogen and potassium fertilization were applied: 100, 200, 300 mg · dm-3. Biometrical measurements were carried out for Coreopsis grandiflora in the 10th week of growing, and for Delphinium grandiflora in the 8th week of growing. In both species, the tuft formation, flowering and yield of plant fresh mass significantly increased under the influence of the increasing amount of nitrogen used in the fertilization, but they did not depend on the potassium doses in the substrate. The highest values of the investigated features were obtained after the application of 300 mg N · dm-3 of substrate.