Exogenous application of vitamins as regulators for growth and development of plants — a review

A survey of the recent literature on plant responses to exogenous vitamin application yielded the following results: Vitamins have been applied by soaking seeds, dipping cuttings, by sprays or dusts and as drenches to soils. Substantial yield increases due to exogenous vitamin application have been reported by a number of researchers. Vitamins may cause morphogenetic responses in plants. Most pronounced is the stimulation of root formation and of flowering under non‐inductive conditions. Certain vitamins protect plants against ozone and sulfur dioxide, two important agents of air pollution.