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Chilling requirement

The chilling requirement of a fruit is the minimum period of cold weather after which a fruit-bearing tree will blossom. It is often expressed in chill hours, which can be calculated in different ways, all of which essentially involve adding up the total amount of time in a winter spent at certain temperatures.[1][2]

Some bulbs have chilling requirements to bloom, and some seeds have chilling requirements to sprout.

Biologically, the chilling requirement is a way of ensuring that vernalization occurs.

Chilling units or chilling hours edit

A chilling unit in agriculture is a metric of a plant's exposure to chilling temperatures. Chilling temperatures extend from freezing point to, depending on the model, 7 °C (45 °F) or even 16 °C (60 °F).[3] Stone fruit trees and certain other plants of temperate climate develop next year's buds in the summer. In the autumn the buds become dormant, and the switch to proper, healthy dormancy is triggered by a certain minimum exposure to chilling temperatures. Lack of such exposure results in delayed and substandard foliation, flowering and fruiting. One chilling unit, in the simplest models, is equal to one hour's exposure to the chilling temperature; these units are summed up for a whole season. Advanced models assign different weights to different temperature bands.

Requirements edit

According to Fishman, chilling in trees acts in two stages. The first is reversible: chilling helps to build up the precursor to dormancy, but the process can be easily reversed with a rise in temperature. After the level of precursor reaches a certain threshold, dormancy becomes irreversible and will not be affected by short-term warm temperature peaks.[4] Apples have the highest chilling requirements of all fruit trees, followed by apricots and, lastly, peaches. Apple cultivars have a diverse range of permissible minimum chilling: most have been bred for temperate weather, but Gala and Fuji can be successfully grown in subtropical Bakersfield, California.[5]

Peach cultivars in Texas range in their requirements from 100 chilling units (Florida Grande cultivar, zoned for low chill regions) to 1,000 units (Surecrop, zoned for high chill regions).[6] Planting a low-chilling cultivar in a high-chill region risks loss of a year's harvest when an early bloom is hit by a spring frost.[6] A high-chilling cultivar planted in a low-chill region will, quite likely, never fruit at all. A four-year study of Ruston Red Alabama peach, which has a threshold of 850 chilling units, demonstrated that a seasonal chilling deficiency of less than 50 units has no effect on harvest. Deficiency of 50 to 100 units may result in loss of up to 50% of expected harvest. Deficiency of 250 hours and more is a sure loss of practically whole harvest; the few fruit will be of very poor quality and have no market value.[7] Rest-breaking agents (e.g. hydrogen cyanamide, trade name BudPro or Dormex), applied in spring, can partially mitigate the effects of insufficient chilling. BudPro can substitute for up to 300 hours of chilling, but an excessive spraying and timing error can easily damage the buds.[7] Other products such as Dormex use stabilizing compounds.

Chilling of orange trees has two effects. First, it increases production of carotenoids and decreases chlorophyll content of the fruit, improving their appearance and, ultimately, their market value. Second, the "quasi-dormancy" experienced by orange trees triggers concentrated flowering in spring, as opposed to more or less uniform round-the-year flowering and fruiting in warmer climates.[5]

Biennial plants like cabbage, sugar beet, celery and carrots need chilling to develop second-year flowering buds. Excessive chilling in the early stages of a sugar beet seedling, on the contrary, may trigger undesired growth of a flowering stem (bolting) in its first year. This phenomenon has been offset by breeding sugar beet cultivars with a higher minimum chilling threshold. Such cultivars can be seeded earlier than normal without the risk of bolting.[5]

Models edit

All models require hourly recording of temperatures.[4] The simplest model assigns one chilling unit for every full hour at temperatures below 7 °C (45 °F). A slightly more sophisticated model excludes freezing temperatures, which do not contribute to proper dormancy cycle, and counts only hours with temperatures between 0 °C (32 °F) and 7 °C (45 °F).[3]

The Utah model assigns different weight to different temperature bands; a full unit per hour is assigned only to temperatures between 3 °C (37 °F) and 9 °C (48 °F). Maximum effect is achieved at 7 °C (45 °F).[4] Temperatures between 13 °C (55 °F) and 16 °C (60 °F) (the threshold between chilling and warm weather) have zero weight, and higher temperature have negative weights: they reduce the beneficial effects of an already accumulated chilling hours.[3]

Southwick et al. wrote that neither of these models is accurate enough to account for application of rest-breaking agents widely used in modern farming. They advocated the use of a dynamic model tailored to the two-stage explanation of dormancy.[4]

References edit

  1. ^ "Chilling hours". Texas A&M University Agricultural Research & Extension Center at Overton.
  2. ^ David W. Lockwood and D. C. Coston. (PDF). Archived from the original (PDF) on 2010-06-10.
  3. ^ a b c Byrne, D. H., and T. A. Bacon (1992). Chilling estimation: its importance and estimation 2015-09-09 at the Wayback Machine. The Texas Horticulturist 18(8):5, 8-9. Retrieved 2010-05-24.
  4. ^ a b c d Southwick, S.; Khan, Z.; Glozer, K. (2003). Evaluation of Chill Models from Historical Rest-Breaking Spray Experiments on Bing Sweet Cherry. University of California, Davis. Retrieved 2010-05-24.
  5. ^ a b c Hall, Anthony (2001). Crop responses to environment. CRC Press. ISBN 0-8493-1028-8. p. 87.
  6. ^ a b Kamas, J.; McEachern, J. R; Stein, L.; Roe, N. (1998). Peach Production in Texas, table 1. Texas A&M University. Retrieved 2010-05-24.
  7. ^ a b Powell, A. (1999). Action Program for Dormex Application on Peaches 2018-06-20 at the Wayback Machine. Auburn University. Retrieved 2010-05-24.

External links edit

  • Harvest Prediction Model for the counties and towns of California 2011-08-17 at the Wayback Machine. University of California Agricultural and Natural Resources.
  • gardenweb discussion of chilling requirements
  • permaculture discussion of chilling requirements 2013-01-14 at the Wayback Machine
  • chill accumulation calculator for wunderground.com weather stations 2016-01-09 at the Wayback Machine

chilling, requirement, chilling, unit, redirects, here, machines, chiller, water, chiller, chilling, requirement, fruit, minimum, period, cold, weather, after, which, fruit, bearing, tree, will, blossom, often, expressed, chill, hours, which, calculated, diffe. Chilling unit redirects here For the machines see Chiller and Water chiller The chilling requirement of a fruit is the minimum period of cold weather after which a fruit bearing tree will blossom It is often expressed in chill hours which can be calculated in different ways all of which essentially involve adding up the total amount of time in a winter spent at certain temperatures 1 2 Some bulbs have chilling requirements to bloom and some seeds have chilling requirements to sprout Biologically the chilling requirement is a way of ensuring that vernalization occurs Contents 1 Chilling units or chilling hours 2 Requirements 3 Models 4 References 5 External linksChilling units or chilling hours editA chilling unit in agriculture is a metric of a plant s exposure to chilling temperatures Chilling temperatures extend from freezing point to depending on the model 7 C 45 F or even 16 C 60 F 3 Stone fruit trees and certain other plants of temperate climate develop next year s buds in the summer In the autumn the buds become dormant and the switch to proper healthy dormancy is triggered by a certain minimum exposure to chilling temperatures Lack of such exposure results in delayed and substandard foliation flowering and fruiting One chilling unit in the simplest models is equal to one hour s exposure to the chilling temperature these units are summed up for a whole season Advanced models assign different weights to different temperature bands Requirements editAccording to Fishman chilling in trees acts in two stages The first is reversible chilling helps to build up the precursor to dormancy but the process can be easily reversed with a rise in temperature After the level of precursor reaches a certain threshold dormancy becomes irreversible and will not be affected by short term warm temperature peaks 4 Apples have the highest chilling requirements of all fruit trees followed by apricots and lastly peaches Apple cultivars have a diverse range of permissible minimum chilling most have been bred for temperate weather but Gala and Fuji can be successfully grown in subtropical Bakersfield California 5 Peach cultivars in Texas range in their requirements from 100 chilling units Florida Grande cultivar zoned for low chill regions to 1 000 units Surecrop zoned for high chill regions 6 Planting a low chilling cultivar in a high chill region risks loss of a year s harvest when an early bloom is hit by a spring frost 6 A high chilling cultivar planted in a low chill region will quite likely never fruit at all A four year study of Ruston Red Alabama peach which has a threshold of 850 chilling units demonstrated that a seasonal chilling deficiency of less than 50 units has no effect on harvest Deficiency of 50 to 100 units may result in loss of up to 50 of expected harvest Deficiency of 250 hours and more is a sure loss of practically whole harvest the few fruit will be of very poor quality and have no market value 7 Rest breaking agents e g hydrogen cyanamide trade name BudPro or Dormex applied in spring can partially mitigate the effects of insufficient chilling BudPro can substitute for up to 300 hours of chilling but an excessive spraying and timing error can easily damage the buds 7 Other products such as Dormex use stabilizing compounds Chilling of orange trees has two effects First it increases production of carotenoids and decreases chlorophyll content of the fruit improving their appearance and ultimately their market value Second the quasi dormancy experienced by orange trees triggers concentrated flowering in spring as opposed to more or less uniform round the year flowering and fruiting in warmer climates 5 Biennial plants like cabbage sugar beet celery and carrots need chilling to develop second year flowering buds Excessive chilling in the early stages of a sugar beet seedling on the contrary may trigger undesired growth of a flowering stem bolting in its first year This phenomenon has been offset by breeding sugar beet cultivars with a higher minimum chilling threshold Such cultivars can be seeded earlier than normal without the risk of bolting 5 Models editAll models require hourly recording of temperatures 4 The simplest model assigns one chilling unit for every full hour at temperatures below 7 C 45 F A slightly more sophisticated model excludes freezing temperatures which do not contribute to proper dormancy cycle and counts only hours with temperatures between 0 C 32 F and 7 C 45 F 3 The Utah model assigns different weight to different temperature bands a full unit per hour is assigned only to temperatures between 3 C 37 F and 9 C 48 F Maximum effect is achieved at 7 C 45 F 4 Temperatures between 13 C 55 F and 16 C 60 F the threshold between chilling and warm weather have zero weight and higher temperature have negative weights they reduce the beneficial effects of an already accumulated chilling hours 3 Southwick et al wrote that neither of these models is accurate enough to account for application of rest breaking agents widely used in modern farming They advocated the use of a dynamic model tailored to the two stage explanation of dormancy 4 References edit Chilling hours Texas A amp M University Agricultural Research amp Extension Center at Overton David W Lockwood and D C Coston Peach tree physiology PDF Archived from the original PDF on 2010 06 10 a b c Byrne D H and T A Bacon 1992 Chilling estimation its importance and estimation Archived 2015 09 09 at the Wayback Machine The Texas Horticulturist 18 8 5 8 9 Retrieved 2010 05 24 a b c d Southwick S Khan Z Glozer K 2003 Evaluation of Chill Models from Historical Rest Breaking Spray Experiments on Bing Sweet Cherry University of California Davis Retrieved 2010 05 24 a b c Hall Anthony 2001 Crop responses to environment CRC Press ISBN 0 8493 1028 8 p 87 a b Kamas J McEachern J R Stein L Roe N 1998 Peach Production in Texas table 1 Texas A amp M University Retrieved 2010 05 24 a b Powell A 1999 Action Program for Dormex Application on Peaches Archived 2018 06 20 at the Wayback Machine Auburn University Retrieved 2010 05 24 External links editHarvest Prediction Model for the counties and towns of California Archived 2011 08 17 at the Wayback Machine University of California Agricultural and Natural Resources gardenweb discussion of chilling requirements permaculture discussion of chilling requirements Archived 2013 01 14 at the Wayback Machine chill accumulation calculator for wunderground com weather stations Archived 2016 01 09 at the Wayback Machine Retrieved from https en wikipedia org w index php title Chilling requirement amp oldid 1188019000, wikipedia, wiki, book, books, library,

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