Rest Prediction Model for Low-chilling ‘Sungold’ Nectarine1

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Abstract
Floral bud break of 1-year-old rooted cuttings of ‘Sungold’ nectarine (Prunus persica (L.) Batsch) was observed following chilling at constant and diurnal temperature regimes. Continuous exposure to 10°C was as effective as 7°. Rate of bud break increased as chilling increased up to 750 hours. Floral bud break of plants exposed to 14 days at 30° during the middle of the chilling period was more rapid but failed to reach the level of activity of plants exposed to constant temperatures. A chill unit model developed for ‘Sungold’ nectarine which has a chilling requirement of 550 hours indicated a broader range of effective temperatures and a higher optimum for rest completion as compared to the Utah model and predicted rest completion more accurately than other methods when applied to orchard temperature data.

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