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Long-day Photoperiod

LD to the shoot can program plants to flower

LD and cold can substitute on a week-for-week basis after bulbs are treated with 1 to 2 weeks of cold

Ex: 6 wks cold = 2 wks cold + 4 weeks LD

At temperatures > 700F the LD treatment can not be perceived

If bulbs have 6 weeks cold, LD will only increase height and decrease bud count

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