Fruit & Nut Crop Chill Portions Requirements

Chill Portions Requirements, Calculated using the Dynamic Model

Compiled by Katherine Jarvis-Shean, Dept. of Plant Sciences, UC Davis

Species	Cultivar	Chill Portions	Standard Deviation	Location of Study
Almond	Nonpareil¹	23*	-	Central Valley, Chile
	Desmao Largueta¹	28*	-	Central Valley, Chile
	Ferragnes¹	32*	-	Central Valley, Chile
Apple	Golden Delicious²	50†	-	-
Apricot	Currot³	34.3	6.1	Murcia, Spain
	Currot³	39.6	3.74	Murcia, Spain & 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 & 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 & Tuscany, Italy
	Goldrich⁴	61.9	4.94	Murcia, Spain & 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
	Rainer²	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†	-	-
	Maraviha²	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)

Compiled by Katherine Jarvis-Shean, Dept. of Plant Sciences, UC Davis 4/28/2011
kjarvisshean@ucdavis.edu

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† Values from unpublished experimental work summarized in Temperate Fruit Crop Production in Warm Climates.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.
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.

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