mr smithclonian III
Member
what is a good humidity range for hydro mmj a good starting point???
now that i am back on track
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mr smithclonian III
Member
air is 70 degrees water 69 degrees 
MonkE
Member
For veg or flower?
Veg doesn't really matter... It can be as high or low as you like. If it's higher then make sure you have good airflow around your plants. If it's low then expect to see some funky looking leaves.
For flowering keep it as low as you can. The lower you're able to get it the more you'll need to water and keeping temps low will become vital. I find that the lower I can keep my humidity the more potent and resinous the end result is.
Veg doesn't really matter... It can be as high or low as you like. If it's higher then make sure you have good airflow around your plants. If it's low then expect to see some funky looking leaves.
For flowering keep it as low as you can. The lower you're able to get it the more you'll need to water and keeping temps low will become vital. I find that the lower I can keep my humidity the more potent and resinous the end result is.
cues
Well-Known Member
LOL. Ideally about 70% for veg, dropping to 40% or less in late flower, but it also depends upon the temperature. The main reason for dropping is to prevent mould and, arguably to promote thc production (although there is a lot of argument lately that additional UV lighting is a better way achieving this).
Also, carbon filters become less effective at higher humidities (50% effective at 65% and useless at 85%)
The link between Humidity and Temperature Is called the 'VPD', the vapour pressure deficit. It has a profound impact on the growth of plants as it controls the rate of respiration and photosynthesis.
To cut a long story short, it means the higher the temperature, the higher the humidity should be, within certain parameters. You want a VPD of about 1.0 through veg but will have no choice but to raise it it during flower (Ironically, raising it means dropping the temp and RH on the VPD scale)
It's all about striking a balance between VPD, thc production, mould, pest and disease control and odour control. The trouble is, you need to be able to control these variables (Humidity, temps) accurately to use them to full advantage and have the knowledge to do so at appropriate times. For example, you may want to drop the temps and raise humidity if you have spider mites or do the exact opposite in the case of fungal diseases.
Look up your VPD here http://www.autogrow.com/vpd_calc.php.
Also, carbon filters become less effective at higher humidities (50% effective at 65% and useless at 85%)
The link between Humidity and Temperature Is called the 'VPD', the vapour pressure deficit. It has a profound impact on the growth of plants as it controls the rate of respiration and photosynthesis.
To cut a long story short, it means the higher the temperature, the higher the humidity should be, within certain parameters. You want a VPD of about 1.0 through veg but will have no choice but to raise it it during flower (Ironically, raising it means dropping the temp and RH on the VPD scale)
It's all about striking a balance between VPD, thc production, mould, pest and disease control and odour control. The trouble is, you need to be able to control these variables (Humidity, temps) accurately to use them to full advantage and have the knowledge to do so at appropriate times. For example, you may want to drop the temps and raise humidity if you have spider mites or do the exact opposite in the case of fungal diseases.
Look up your VPD here http://www.autogrow.com/vpd_calc.php.
mr smithclonian III
Member
thank you!!!! respect!!!!
respect!!!!