Abstract
Abstract Optimal substrate fertilization level was compared with half and double of the corresponding rate on azalea (Rhododendron simsii Planch, cv. Glas 10) plants under glasshouse and controlled environment conditions. Although variations in gas exchange characteristics between the 3 treatments were small, significant differences in crown dimension, leaf area index, root/shoot ratio and total plant dry weight were found. Optimal fertilization resulted in significantly higher total plant dry weight and crown diameter. Since the latter determines the market price, this has important economical implications.
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