Table 1. Chill Requirements in Chill Portions, calculated using the Dynamic Model.
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† Values from unpublished experimental work summarized in Temperate Fruit Crop Production in Warm Climates .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.

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References:

  1. 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.
  2. 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.
  3. Ruiz, D., J. A. Campoy, et al. (2007). Chilling and heat requirements of apricot cultivars for flowering. Environmental and Experimental Botany 61: 254-263.
  4. 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.
  5. 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.
  6. 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.
  7. 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.