Heat Requirement from Blooming to Maturing in Apricot Cultivars
Abstract
Heat requirement from blooming to maturing in 15 apricot cultivars grown in the Belgrade region was determined by the Growing Degree Days method (GDD), using 8-year-phenological data. Two methods for calculating daily mean air temperatures were evaluated: (1) the mean of the maximum and minimum daily temperature (Max/Min), and (2) the mean of three equally spaced hourly observations weighted with the last observation (Weighted). The least coefficient of variation in GDD method was applied to obtain the best lower and upper threshold temperatures. The obtained the best lower threshold temperature varied from 0 degrees C in cultivar 'Kishiniev Early' to 7 degrees C in cultivar 'Roxana'. Calculations of daily mean air temperatures by Weighted method resulted in a smaller coefficient of variation than Max/Min method. Introduction of the upper threshold led to an increase of the coefficient of variation in GDD. The number of days from full blossoming to maturing ranged from 82 to 112. Takin...g 3 degrees C as the base temperature (the mean value of all cultivars studied), the accumulated GDD between these two phenological stages varied from 1056 (in 'Senetate') to 1648 (in 'Kecskemet Rose').
Keywords:
Prunus armeniaca / growing degree days / threshold temperature / phenology / daily mean air temperatureSource:
Acta Horticulturae, 2010, 862, 245-250Collections
Institution/Community
Poljoprivredni fakultetTY - CONF AU - Milatović, Dragan AU - Ruml, Mirjana AU - Vulić, Todor PY - 2010 UR - http://aspace.agrif.bg.ac.rs/handle/123456789/2147 AB - Heat requirement from blooming to maturing in 15 apricot cultivars grown in the Belgrade region was determined by the Growing Degree Days method (GDD), using 8-year-phenological data. Two methods for calculating daily mean air temperatures were evaluated: (1) the mean of the maximum and minimum daily temperature (Max/Min), and (2) the mean of three equally spaced hourly observations weighted with the last observation (Weighted). The least coefficient of variation in GDD method was applied to obtain the best lower and upper threshold temperatures. The obtained the best lower threshold temperature varied from 0 degrees C in cultivar 'Kishiniev Early' to 7 degrees C in cultivar 'Roxana'. Calculations of daily mean air temperatures by Weighted method resulted in a smaller coefficient of variation than Max/Min method. Introduction of the upper threshold led to an increase of the coefficient of variation in GDD. The number of days from full blossoming to maturing ranged from 82 to 112. Taking 3 degrees C as the base temperature (the mean value of all cultivars studied), the accumulated GDD between these two phenological stages varied from 1056 (in 'Senetate') to 1648 (in 'Kecskemet Rose'). C3 - Acta Horticulturae T1 - Heat Requirement from Blooming to Maturing in Apricot Cultivars EP - 250 SP - 245 VL - 862 UR - https://hdl.handle.net/21.15107/rcub_agrospace_2147 ER -
@conference{ author = "Milatović, Dragan and Ruml, Mirjana and Vulić, Todor", year = "2010", abstract = "Heat requirement from blooming to maturing in 15 apricot cultivars grown in the Belgrade region was determined by the Growing Degree Days method (GDD), using 8-year-phenological data. Two methods for calculating daily mean air temperatures were evaluated: (1) the mean of the maximum and minimum daily temperature (Max/Min), and (2) the mean of three equally spaced hourly observations weighted with the last observation (Weighted). The least coefficient of variation in GDD method was applied to obtain the best lower and upper threshold temperatures. The obtained the best lower threshold temperature varied from 0 degrees C in cultivar 'Kishiniev Early' to 7 degrees C in cultivar 'Roxana'. Calculations of daily mean air temperatures by Weighted method resulted in a smaller coefficient of variation than Max/Min method. Introduction of the upper threshold led to an increase of the coefficient of variation in GDD. The number of days from full blossoming to maturing ranged from 82 to 112. Taking 3 degrees C as the base temperature (the mean value of all cultivars studied), the accumulated GDD between these two phenological stages varied from 1056 (in 'Senetate') to 1648 (in 'Kecskemet Rose').", journal = "Acta Horticulturae", title = "Heat Requirement from Blooming to Maturing in Apricot Cultivars", pages = "250-245", volume = "862", url = "https://hdl.handle.net/21.15107/rcub_agrospace_2147" }
Milatović, D., Ruml, M.,& Vulić, T.. (2010). Heat Requirement from Blooming to Maturing in Apricot Cultivars. in Acta Horticulturae, 862, 245-250. https://hdl.handle.net/21.15107/rcub_agrospace_2147
Milatović D, Ruml M, Vulić T. Heat Requirement from Blooming to Maturing in Apricot Cultivars. in Acta Horticulturae. 2010;862:245-250. https://hdl.handle.net/21.15107/rcub_agrospace_2147 .
Milatović, Dragan, Ruml, Mirjana, Vulić, Todor, "Heat Requirement from Blooming to Maturing in Apricot Cultivars" in Acta Horticulturae, 862 (2010):245-250, https://hdl.handle.net/21.15107/rcub_agrospace_2147 .