Is there interest in using thermal units (degree days for crops) for research projects and do researchers want a ready-made package do this?
We have a cropgrowdays R package and it can be extended for use if data analysts and statisticians agricultural researchers would like more functionality.
Agronomists use crop degree days with a base and max temperature.
We use days of year, financial days of year (in Australia 1 July in the start of our financial year) and days after sowing etc.
Animal scientists may need stress days - days over a particular temperature.
There are cumulative and daily averages of weather that may be required for particular projects. Please get in touch with ideas and please check out our package. Our details on the attached poster
Chill hours are the number of cold hours or days that a deciduous fruit tree (or nut tree) requires for flowering and fruit production each year.
The rate and duration of plant development depends on tem-perature and time. A common means of normalizing temperature effects on development is the use of thermal time or heat units . The use of thermal time instead of real or calendar time tends to produce experimentalresults that are transferable and comparable, even though the results may be from specific locations and environments. Couvillon and Erez (1985) used heat units in describing flowering response to chilling of several fruit species other than blueberry.
With daily extracted met data this package allow you to calculate thermal time for any start and stop date, and you can change the base and cap temperature for thermal degree day units . Can also be used for heat stress - days over a temperature ; cold stress with days below a cold temperature of your choice.
Calculate cumulative or daily mean for custom periods.
Hi Miranda Mortlock, great package! Yes I recently needed to calculate thermal time for GPP/NPP modelling. Wondering if we could work on a package which calculates thermal time based on following inputs: base temp, max temp, date of sowing. It would bring global climate data in from GLDAS, ERA5 or another source. I think that would be helpful. Yes, animal researchers may be interested in calculated accumulated heat load which is particularly dependent on night-time temps. Talk soon. Michael
Hi Miranda, it would also be a nice addition if it were possible to calculate thermal time based on temperatures captured at higher frequency, such as hourly data from a weather station.
The cropgrowdays R package is in git, and all the documentation is available if you install in R and go to the help and documentation of the package.
Kindly share and the software and manual for the research program may highly beneficial to us... I acknowledgment the same if u share
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