Effect of elevated carbon dioxide and rooting hormone on propagation of Euonymus Moonshadow

Abstract: Although effect of rooting hormone in the propagation of ornamental species has been studied by many scientists, very few have contributed to understanding the effect of supplemental carbon dioxide(CO₂) in rooting of plants. With the aim of understanding the effect of CO₂ in rooting and its interaction with rooting hormone treatment, a greenhouse study was conducted. Two identical greenhouses were used in which, one was supplied with an average of 800 ppm of CO₂and the other one was at about 400 ppm (ambient) throughout the rooting period. Rooting hormone treatments were control, 1000, 3000 and 5000 ppm concentrations of Dip’N Grow. Elevated CO₂ did not promote root development when compared to ambient condition. However, increasing rooting hormone concentration significantly affected the rooting parameters. Rooting percentage was not improved under elevated CO₂. Ambient CO₂ with 5000 ppm concentration of Dip’N Grow showed greater root number.