Effect of Various Growth-Regulating Substances upon Several Species of Plants

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Abstract
Chrysanthemum plants receiving naphthaleneacetic acid in a conc. of 0.1 mg. per liter of minus K nutrient soln. showed a significant increase in dry wt. over controls. Neither vitamin B1 nor naphthaleneacetic acid supplied in the same conc. per liter of complete nutrient soln. produced any significant difference. No significant difference in dry wt. occurred between Burpee Golden Cosmos plants used as controls and those receiving 0.01 mg. of naphthaleneacetic acid, nicotinic acid, or nicotinic acid and vitamin B1 per liter of complete nutrient. Harmony Marigold plants showed little variation in dry wt. when supplied with nicotinic acid, or with a combination of nicotinic acid and vitamin B1. A significant decrease in the total dry wt. of the marigold plants supplied with naphthaleneacetic acid (0.01 mg. per liter) indicates a retarding effect of the acid on growth.