Effects of vermicompost from different organic wastes on the growth and flowering characteristics of Zinnia elegans

This study evaluates the effectiveness of vermicomposting as a sustainable waste management strategy by utilizing cow manure alone (100%) and in combination with flower waste (80:20). The experiment was conducted to assess the impact of these vermicompost on soil physicochemical properties and the growth and reproductive performance of Eudrilus eugeniae. Furthermore, the effects of vermicompost on the growth and flowering characteristics of Zinnia elegans were examined in pot culture experiments. The results indicated significant improvements in soil macronutrient and micronutrient composition in both vermicompost treatments (V1 and V2), with V2 (cow manure 80% + flower waste 20%) exhibiting superior nutrient enrichment. Earthworm biomass gain, cocoon production, and hatching success were significantly higher in V2 compared to V1, highlighting the enhanced substrate quality of mixed organic waste. Zinnia plants grown in V2-amended potting media showed superior vegetative and floral attributes, including increased plant height, shoot and root biomass, number of flowers, and flower diameter. These findings demonstrate that vermicomposting of mixed organic waste enhances compost quality, promotes earthworm productivity, and improves plant growth performance, making it a viable approach for sustainable waste management and horticultural applications.