Having met the chilling requirements of endodormancy, the cold-heat interaction effect appears, and
the ecodormancy stage has begun. During ecodormancy, the buds gradually acquire the ability to sprout.
The chill needs of both stages are complementary and their addition is the entire requirement of latency.
To study the chilling requirement of endodormancy it measured the effects that produce growing
quantities of chill unit Utah modified (CU) and small amounts of growing degree hours (GDHºC) on
the vegetative budbreak of Brooks, New Star, Garnet and Stella varieties. The tests were performed on
materials that receive UFUM under controlled and field conditions and GDHºC under field and greenhouse
condition. The models conveniently estimated the behavior of budbreak. The endodormancy requirements
were 355, 530, 469 and 736 and the ecodormancy requirements were 460, 480, 370 and 560 respectively for Brooks, New Star Garnet and Stella varieties. Due to cold-heat interaction at ecodormancy
stage, the requirements vary with both the variety and availability of winter chill and spring heat.
During the ecodormancy, when only the heat is increased, usually achieved greater budbreak response
than those in which only the cold increases (Brooks, New Star and Stella). Other variety like Garnet the
effect of cold-heat is more balanced. Among these varieties endodormancy requirements have greater
variability than those of the ecodormancy.
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