Abstract
Abstract Five fertigation treatments were initiated August 1, 2002: 1) no additional fertilizer, 2) N at 75 mg·L−1 from August 1 to September 29, 3) N at 125 mg·L−1 from August 1 to September 29, 4) N at 75 mg·L−1 from August 1 to November 28, and 5) N at 125 mg·L−1 from August 1 to November 28. Freeze resistance of stems and leaves was analyzed monthly, November to February. Flower counts began prior to budbreak, and continued to flower expression. Fall fertigation increased azalea leaf and stem dry weights (DWs) compared to azaleas that received no additional fertigation after July 31. Fertigation N applied at 75 or 125 mg·L−1 from August 1 to November 28 did not increase leaf or stem DWs compared to plants fertigated at the same N rate from August 1 to September 29. High N treatments (N at 125 mg·L−1 from August 1 to September 29 or November 28) increased above ground DW, but reduced stem freeze resistance in November and March compared to plants that received N at 75 mg·L−1 from August 1 to September 29. Early flower budbreak and decreased total flower production resulted when N was applied at 125 mg·L−1 from August 1 to November 28 compared to 75 mg·L−1 from August 1 to September 29.
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