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.