20.500.12556/RUL-184243 Effect of nitrogen forms on vegetative growth and flower development at hydroponically grown geraniums (Pelargonium zonale × Pelargonium peltatum) Nitrogen is an essential macronutrient that greatly influences plant metabolism, growth and development. In plants, nitrogen is taken up in the form of nitrate (NO₃⁻) or ammonium (NH₄⁺), which affect plant physiology, root and shoot growth and the transition to generative phase differently. In this study we investigated the effect of nitrate and ammonium nitrogen forms on growth and development of hydroponically grown geranium plants. Rooted cuttings were cultivated in a floating hydroponic system with four treatments, differing in the nitrate-toammonium ratio in the nutrient solution. Treatment with an equal ratio of nitrate and ammonium resulted in greatest increase in shoot and root biomass, together with higher concentrations of chlorophyll a, and ammonium nitrogen in leaves. Treatment with 80:20 ratio (NO₃⁻: NH₄⁺) also had a positive effect on biomass production. Higher nitrate ratios (90%, 100%) promoted higher flowering intensity compared to the 50% nitrate treatment. These findings suggest that a proper ratio of nitrate and ammonium can positively influence growth by increasing shoot and root biomass and enhancing leaf production. The quality of hydroponically grown geraniums can be improved through the optimization of nitrogen form ratios in the nutrient solution. hydroponics geranium nitrate ammonium growth flowering pigments hidroponika okrasne rastline pelargonije potaknjenci gnojenje dušična gnojila cvetenje rast pigmenti true false true Angleški jezik Slovenski jezik Članek v reviji 2026-07-02 12:04:25 2026-07-02 12:04:33 2026-07-03 04:23:35 0000-00-00 00:00:00 2026 0 0 7 str. art. 114979 Vol. 365 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 635 0304-4238 10.1016/j.scienta.2026.114979 283412227 1-s2.0-S0304423826003717-main.pdf 1-s2.0-S0304423826003717-main.pdf 1 BE8BBD50CEC329FF6A01327FE5C7E028 413768c3883081e54a320652178184adf33f0f84f457379e8824756ce4caccca 7a28bba0-75fd-11f1-9b0d-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=236859 https://www.sciencedirect.com/science/article/pii/S0304423826003717 1 5315cda6-75fd-11f1-9b0d-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=236858 Biotehniška fakulteta 0 0 0