There have been reports in trade magazines about the positive response of growth regulators in dry-bulb onion production.
Reports claim greater yields and larger size bulbs from treated fields.
This project examined the effect of two growth regulators on onion bulb yield and size. The growth regulators evaluated were Triggrr, manufactured by Westbridge, and Propel, manufactured by Entek. The first Triggrr application was made at planting by injecting the material into the soil through the planter shoe so that it was in close proximity to the germinating seed. The second application was made at the early bulbing stage by sidedressing the material into the bed approximately 2 inches to the side of the row. Propel was applied as a foliar spray at about mid-bulbing.