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Measure Chill Hours with Jain Logic

What are chill hours/chill units?

Chill hours and chill units both refer to the total amount of time a blossoming fruit tree needs to be exposed to cold temperatures so that it can flower and fruit.

How to use chill hours to plan and maintain the health of your crops.

Knowing the required number of chill hours allows growers to plan ahead and account for which stage of the tree’s life cycle it’s in.

Insufficient chill units can result in reduced fruit set, fruit quality, delayed foliation and extended bloom periods. To combat insufficient chill hours growers may choose to promote flowering and vegetative bud break growers using Rest Breaking Agents (RBAs), bringing the tree out of its dormancy stage.

On the other hand, too many chill units can cause trees to flower early, exposing the sensitive new shoots to frost damage, causing damaged foliage and killing fruit. Growers may use foggers, sprinklers, and fans to prevent frost and set frost alerts in Jain Logic to reduce the risk of frost damage ruining their yield.

How do we calculate chill hours?

Our platform Jain Logic allows you to select one of the following methods; Threshold and Utah.

  • Threshold Method: Any hour with an average temperature under the supplied threshold is considered a chill unit. Example: If our set threshold is 7°C, every hour below 7°C will be equal to one chill unit.
  • Utah Method: A temperature range is used to calculate chill units. The range determines how many chill units to apply below a set range. It also deducts for when temperatures are above a threshold range, from the accumulative chill units.

Want to start using Jain Logic?

Priya Johal

A relative newcomer to the irrigation industry, Priya has applied her experience and passion for technology to improve everyday workflows and help users save resources. The issues surrounding sustainable farming practices and the need to prioritise world efforts to save water have motivated her to work in the irrigation industry. Taking from prior experiences, as part of the enterprise mobility rollout in Australasia, where smart devices were used to provide access to online forms replacing everyday paper workflows and documentation. The digital alternatives allowed users to more readily capture real-time data and as a result, make better and more informed decisions. Seeing the major benefits of using technology in industries that have otherwise remained stagnant has driven her to focus on promoting a shift in the way we work, achieving increased productivity, reducing costs, saving time and in the case of irrigation, optimising water usage.


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