Response of Easter Lily to Bulb Treatments of Precooling, Packing Media, Moisture, and Gibberellin1
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Abstract ‘Harson’ lily bulbs were precooled at 45 to 50°F for 0, 2, 4 and 6 weeks in damp peat (68% moisture) or dry peat (8% moisture) and then soaked for 2 hr in a 900 ppm solution of GA or tap water prior to forcing. Bulbs precooled in damp peat for 4 to 6 weeks had the shortest stems and earliest flowering. Four weeks precooling in damp peat hastened stem emergence and flowering but reduced flower no. as compared to those precooled 6 weeks in dry peat. Bulbs GA treated and precooled 2 weeks flowered about 4 weeks earlier without a decrease in flower no. compared with bulbs precooled for 0, 2, 4 and 6 weeks. Bulbs precooled 4 weeks in dry peat and treated with GA emerged and flowered as early as those precooled in damp peat for 4 weeks without GA or those in dry peat 6 weeks with or without GA. GA treatment hastened flowering similar to that caused by precooling in damp peat.
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Abstract ‘Harson’ lily bulbs were precooled at 45 to 50°F for 0, 2, 4 and 6 weeks in damp peat (68% moisture) or dry peat (8% moisture) and then soaked for 2 hr in a 900 ppm solution of GA or tap water prior to forcing. Bulbs precooled in damp peat for 4 to 6 weeks had the shortest stems and earliest flowering. Four weeks precooling in damp peat hastened stem emergence and flowering but reduced flower no. as compared to those precooled 6 weeks in dry peat. Bulbs GA treated and precooled 2 weeks flowered about 4 weeks earlier without a decrease in flower no. compared with bulbs precooled for 0, 2, 4 and 6 weeks. Bulbs precooled 4 weeks in dry peat and treated with GA emerged and flowered as early as those precooled in damp peat for 4 weeks without GA or those in dry peat 6 weeks with or without GA. GA treatment hastened flowering similar to that caused by precooling in damp peat.
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