Effect of nitrogen fertilizer and compost on photosynthesis and growth of Virginia fanpetals (Sida hermaphrodita Rusby)
As a perennial bioenergy crop Sida hermaphrodita can play important roles on marginal lands in the near future. In a controlled pot experiments the influence of various compost amounts (10, 20, 30, 50%) und nitrogen fertilizer (100 kg N ha-1) on biomass, height, and carbon allocation were investigated during the establishment phase. Furthermore, ecophysiological parameters (gas exchange, chlorophyll fluorescence, chlorophyll content,) were determined with non-destructive methods. The results of this experiment demonstrated that nitrogen fertilization and compost application has an overall positive effect on the overall growth performance. During the establishment phase, the fertilized plants reached a mean high up to 120 cm. Photosynthesis is not influenced by the treatments and mean net CO2- exchange rates varied between 5,8 and 9,9 µmol m-2 s-1 and electron transport rate between 34,5 and 53,9 µmol m-2 s-1. The application of compost and nitrogen for a better biomass production of Sida in marginal soils is possible, however the growth of is limited in the first year with negative effects on the establishment of larger stands.
Veste, M., Halke, C., Garbe, D., Freese, D. (2016): Einfluß von Stickstoff-Düngung und Kompost auf Wachstum und Photosynthese der Virgininamalve (Sida hermaphrodita Rusby). Journal für Kulturpflanzen 168 (12): 423-428 .