Chilling requirements for breaking dormancy and heat requirements for flowering were studied in 10 apricot cultivars in the region of Belgrade during a 2-year period. Chilling requirements were determined using the Utah chill unit (CU) model. To determine the date of dormancy breaking, 1-year-old shoots were collected weekly from December to February and kept under controlled conditions. Heat requirements were calculated as growing degree hours (GDH) accumulated from the breaking of dormancy to the beginning of flowering using a base temperature of 4 degrees C. The cultivars studied showed a range of chilling requirements, from 834 CU in 'Ninfa' and 'Goldrich' to 1442 CU in 'Re Umberto'. The heat requirements for flowering ranged between 2624 GDH in 'Magyar kajszi' and 3469 GDH in 'Tomcot'. The latest flowering cultivar ('Re Umberto') finished dormancy 42 days after the earliest flowering cultivar ('Ninfa'). The results indicate that flowering time of apricot in the studied region is i...nfluenced more by chilling requirements than by heat requirements. Identification and selection of cultivars with higher chilling requirements and later flowering is important for apricot production, especially in regions with the frequent occurrence of late spring frosts.
TY - CONF
AU - Ruml, Mirjana
AU - Milatović, Dragan
AU - Djurović, Dejan
AU - Zec, Gordan
AU - Jokić, M.
AU - Radović, M.
PY - 2018
UR - http://aspace.agrif.bg.ac.rs/handle/123456789/4623
AB - Chilling requirements for breaking dormancy and heat requirements for flowering were studied in 10 apricot cultivars in the region of Belgrade during a 2-year period. Chilling requirements were determined using the Utah chill unit (CU) model. To determine the date of dormancy breaking, 1-year-old shoots were collected weekly from December to February and kept under controlled conditions. Heat requirements were calculated as growing degree hours (GDH) accumulated from the breaking of dormancy to the beginning of flowering using a base temperature of 4 degrees C. The cultivars studied showed a range of chilling requirements, from 834 CU in 'Ninfa' and 'Goldrich' to 1442 CU in 'Re Umberto'. The heat requirements for flowering ranged between 2624 GDH in 'Magyar kajszi' and 3469 GDH in 'Tomcot'. The latest flowering cultivar ('Re Umberto') finished dormancy 42 days after the earliest flowering cultivar ('Ninfa'). The results indicate that flowering time of apricot in the studied region is influenced more by chilling requirements than by heat requirements. Identification and selection of cultivars with higher chilling requirements and later flowering is important for apricot production, especially in regions with the frequent occurrence of late spring frosts.
PB - Int Soc Horticultural Science, Leuven 1
C3 - XVI International Symposium on Apricot Breeding and Culture
T1 - Chilling and heat requirements for flowering in apricot cultivars
EP - 18
SP - 15
VL - 1214
DO - 10.17660/ActaHortic.2018.1214.3
ER -
@conference{
author = "Ruml, Mirjana and Milatović, Dragan and Djurović, Dejan and Zec, Gordan and Jokić, M. and Radović, M.",
year = "2018",
abstract = "Chilling requirements for breaking dormancy and heat requirements for flowering were studied in 10 apricot cultivars in the region of Belgrade during a 2-year period. Chilling requirements were determined using the Utah chill unit (CU) model. To determine the date of dormancy breaking, 1-year-old shoots were collected weekly from December to February and kept under controlled conditions. Heat requirements were calculated as growing degree hours (GDH) accumulated from the breaking of dormancy to the beginning of flowering using a base temperature of 4 degrees C. The cultivars studied showed a range of chilling requirements, from 834 CU in 'Ninfa' and 'Goldrich' to 1442 CU in 'Re Umberto'. The heat requirements for flowering ranged between 2624 GDH in 'Magyar kajszi' and 3469 GDH in 'Tomcot'. The latest flowering cultivar ('Re Umberto') finished dormancy 42 days after the earliest flowering cultivar ('Ninfa'). The results indicate that flowering time of apricot in the studied region is influenced more by chilling requirements than by heat requirements. Identification and selection of cultivars with higher chilling requirements and later flowering is important for apricot production, especially in regions with the frequent occurrence of late spring frosts.",
publisher = "Int Soc Horticultural Science, Leuven 1",
journal = "XVI International Symposium on Apricot Breeding and Culture",
title = "Chilling and heat requirements for flowering in apricot cultivars",
pages = "18-15",
volume = "1214",
doi = "10.17660/ActaHortic.2018.1214.3"
}
Ruml, M., Milatović, D., Djurović, D., Zec, G., Jokić, M.,& Radović, M.. (2018). Chilling and heat requirements for flowering in apricot cultivars. in XVI International Symposium on Apricot Breeding and Culture
Int Soc Horticultural Science, Leuven 1., 1214, 15-18.
https://doi.org/10.17660/ActaHortic.2018.1214.3
Ruml M, Milatović D, Djurović D, Zec G, Jokić M, Radović M. Chilling and heat requirements for flowering in apricot cultivars. in XVI International Symposium on Apricot Breeding and Culture. 2018;1214:15-18.
doi:10.17660/ActaHortic.2018.1214.3 .
Ruml, Mirjana, Milatović, Dragan, Djurović, Dejan, Zec, Gordan, Jokić, M., Radović, M., "Chilling and heat requirements for flowering in apricot cultivars" in XVI International Symposium on Apricot Breeding and Culture, 1214 (2018):15-18,
https://doi.org/10.17660/ActaHortic.2018.1214.3 . .
