Temperature for most vigorous growth?

[Cerathule]

Hi, I'd like to get some feedback regarding good growth rates in regards to ambient air temperature. There seems to be varying information online, these seem to range in 24-32°C before CO2. Focusing now on growth (not quality) and health/vigour (appearing strong/turgid).

What is your experience, where would you set the optimum point, and how are your environmental circumstances and can you see a difference genetic-wise?

Tyvm

 

[Ca++]

28-30 but 3 out of range is only a 10% cap. Most of us are not likely to ever see 90% of full potential anyway though, so it's not of real concern.
They got this from dishes, and it's about green production.
I find below 25 is be a waste of a grow space. Many mess about for years before realising this. Early books were talking 21c and that was just rubbish.

 

[snakedope]

Well I tried many, never got to 21 but was in the 24 up to 33
in HIDs I saw a big improvement when I set the ambient to around 30-31, The cooltube does the rest with regards to not burning them, they can almost touch it.
At that temp they are growing at an insane rate and show deficiencys a lot more
You really need to be on top of things in these temperatures.
The science behind the temp issue is old, from 25c to 30 is linear, peak output of all parameters is at 30c, lowest point is 25, under that you are stalling growth
Sometimes the ambient reaches 33-34 at flower...
Best places in the world to grow have a 3-4 months when the temps are always 30+ at day and 25+ at night, they are also the months people flower and harvest

 

[revegeta666]

There's not a best temperature as there are many variables in play. Some plants will like it warmer, others colder. With the new LED lamps plants can take a lot higher temps, well over 30, and still be ahppy. What is most important IMO if you want to maximize vigour is to regulate the relative humidity according to the temperature you have. High temperature needs high RH and viceversa. The relationship between these 2 parameters and the transpiration rate of the plant is called VPD. As long as temp is within reasonable limits, VPD is more important than the exact temp. There are charts to check your VPD which are pretty useful.

If you're following one of these you are supposed to aim for the green zone which should put your plants in turbo mode.

EDIT - I changed the VPD chart because for some reason the green zone in the previous one was labaled as 1.3 when it is usually recommended to aim for 0.8/0.9 in veg and 0.9/1 in flower.