Species‡ | Cultivar | Chill Portions | Standard Deviation | Location of Study |
Almond | Nonpareil1 | 23* | - | Central Valley, Chile |
Desmayo Largueta1 | 28* | - | Central Valley, Chile | |
Ferragnes1 | 32* | - | Central Valley, Chile | |
Apple | Golden Delicious2 | 50† | - | - |
Apricot | Currot3 | 34.3 | 6.1 | Murcia, Spain |
Currot4 | 39.6 | 3.74 | Murcia, Spain and Tuscany, Italy | |
Rojo Pasion3 | 51.2 | 4.7 | Murcia, Spain | |
Búlida3 | 53.8 | 2.9 | Murcia, Spain | |
San Castrese4 | 55.25 | 1.42 | Murcia, Spain and Tuscany, Italy | |
Murciana3 | 55.9 | 2.8 | Murcia, Spain | |
Dorada3 | 56.2 | 3.7 | Murcia, Spain | |
Selene3 | 57.4 | 1.8 | Murcia, Spain | |
Orange Red4 | 61.35 | 6.05 | Murcia, Spain and Tuscany, Italy | |
Goldrich4 | 61.9 | 4.94 | Murcia, Spain and Tuscany, Italy | |
Bergeron3 | 64.8 | 2.7 | Murcia, Spain | |
Orange Red3 | 69.1 | 3 | Murcia, Spain | |
Cherry | Cristobalina5 | 30.4 | - | Murcia, Spain |
Lapins2 | 35† | - | - | |
Brooks5 | 36.7 | - | Murcia, Spain | |
Rainier2 | 45† | - | - | |
Ruby5 | 48 | - | Murcia, Spain | |
Somerset5 | 48 | - | Murcia, Spain | |
Burlat5 | 48 | - | Murcia, Spain | |
New Star5 | 53.5 | - | Murcia, Spain | |
Marvin5 | 57.6 | - | Murcia, Spain | |
Sam2 | 70† | - | - | |
Nectarine | Aprilglo2 | 12† | - | - |
Mayglo2 | 18† | - | - | |
Sunlite6 | 33.2 | 6.2 | Western Cape Province, South Africa | |
Flavortop6 | 41.4 | 7.5 | Western Cape Province, South Africa | |
Fantasia6 | 41.7 | 8.1 | Western Cape Province, South Africa | |
Peach | Flordaprince2 | 8† | - | - |
Earligrande2 | 12† | - | - | |
Maravilha2 | 12† | - | - | |
Redhaven2 | 75† | - | - | |
Walnut | Hartley7 | 53.8* | - | California, USA (Central Valley & Coastal Range) |
Payne7 | 68.2* | - | California, USA (Central Valley & Coastal Range) | |
Scharsch Franquette7 | 69.7* | - | California, USA (Central Valley & Coastal Range) | |
Chandler7 | 71.5* | - | California, USA (Central Valley & Coastal Range) |
Note: The numbers next to each cultivar name indicate the source of the information
(listed below). If standard deviations or locations are not listed, they were
not given in the source work. Cultivars are listed twice if there are two values
available in the literature.
* Values modeled from bloom date assuming sequential fulfillment of endo- and
eco-dormancy.
† Values from unpublished experimental work summarized in
Temperate Fruit Crop
Production in Warm Climates
. No standard deviations or locations were given
associated with these figures.
‡ All values are for floral buds, except walnut values which are for male buds.
References:
- Ramirez, L., K. X. Sagredo, et al. (2010). Prediction models for chilling and heat requirements to estimate full bloom of almond cultivars in the Central Valley of Chile. Acta Horticulturae 872: 107-112.
- Erez, A. (2000). Bud dormancy; phenomenon, problems and solutions in the tropics and subtropics. Temperate fruit crops in warm climates. A. Erez. Dordrecht, The Netherlands, Kluwer Academic Publishers: 17-48.
- Ruiz, D., J. A. Campoy, et al. (2007). Chilling and heat requirements of apricot cultivars for flowering. Environmental and Experimental Botany 61: 254-263.
- Viti, R., L. Andreini, et al. (2010). Effect of climatic conditions on the overcoming of dormancy in apricot flower buds in two Mediterranean areas: Murcia (Spain) and Tuscany (Italy). Scientia Horticulturae. 124: 217-224.
- Alburquerque, N., F. Garcia-Montiel, et al. (2008). Chilling and heat requirements of sweet cherry cultivars and the relationship between altitude and the probability of satisfying the chill requirements. Environmental and Experimental Botany 64: 162-170.
- Linsley-Noakes, G. C. and P. Allan (1994). Comparison of two models for the prediction of rest completion in peaches. Scientia Horticulturae 59: 107-113.
- Luedeling, E., M. Zhang, et al. (2009). Validation of winter chill models using historic records of walnut phenology. Agricultural and Forest Meteorology 149: 1854-1864.