Effect of Compost on the Growth, Flowering Attributes, and Vase Life of Different Varieties of Zinnia (Zinnia elegans)

Abstract

Zinnias originates from Mexico and has high demand in the floriculture market. The need to reduce reliance on chemical fertilizers has highlighted the importance of sustainable alternatives like organic manures. Compost application in horticulture is gaining attention as a sustainable alternative to chemical fertilizers, aiming to enhance soil health and plant growth. However, there is a limited understanding of its effects on the growth. This study investigates the effects of compost on the growth, flowering attributes, and vase life of Zinnia elegans to improve cultivation techniques and promote sustainable horticultural practices. The experiment used an RCBD with two factors. When they reached 3-5 true leaves, plantlets were transplanted into 12-inch pots with compost varying concentrations, including Control, 25%, 50%, and 100% with garden soil. Changing compost concentrations and zinnia varieties affected numerous factors strongly. Plant height, for instance, varied significantly, with Benary's Giant cultivar reaching the tallest (72.04 cm) under 50% compost, mirroring the stem diameter's peak at 1.01 cm with the same compost level. Compost levels and zinnia varieties also notably impacted leaf count, lateral branches, leaf area, flower count, and flower attributes like diameter and stalk length. The study also found that 50% of compost extended petal senescence survival. Compost and zinnia interaction affected the flower’s fresh weight and vase life. The interaction cultivar Benary,s Giant with 50% compost in garden soil was optimal for zinnia growth and flowering. This study will provide the basics for floriculture.