A Study on Bud Chilling Requirements of Fruit Trees in Greenhouse The Requirements of Chilling for Bud Dormancy and Caloric for Blooming for 12 Peach Varieties A Study on Bud Chilling Requirements of Fruit Trees in Greenhouse Studies of chilling requirements during rest period in apricot cultirars Differences in Heat Requirements of Flower and Leaf Buds Make  Hysteranthous Trees Bloom before Leaf Unfolding Chilling and Heat Requirements of Main Cultivars of Ping‘ou Hybrid Hazelnuts (Corylus heterophylla×Corylus avellana)