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Table 1 Temperature treatments applied to ‘Summerred’ and ‘Discovery’ apple trees in the years 2016 and 2017

From: Temperature control of shoot growth and floral initiation in apple (Malus × domestica Borkh.)

Year 2016 Year 2017
12 °C constant for 12 weeks 12 °C constant for 12 weeks
15 °C constant for 12 weeks 18 °C constant for 12 weeks
18 °C constant for 12 weeks 24 °C constant for 12 weeks
21 °C constant for 12 weeks 27 °C constant for 12 weeks
12 °C for 6 w.—then 18 °C for 6 w. 12 °C for 6 w.—then 24 °C for 6 w.
15 °C for 6 w.—then 21 °C for 6 w. 18 °C for 6 w.—then 27 °C for 6 w.
18 °C for 6 w.—then 12 °C for 6 w. 24 °C for 6 w.—then 12 °C for 6 w.
21 °C for 6 w.—then 15 °C for 6 w. 27 °C for 6 w.—then 18 °C for 6 w.