Plants smell like cut grass when lights go off?

[Milky Weed]

Its not really an issue just something i noticed. It almost smells like ”stressed plant” if thats a thing?

I noticed it was even more powerful today when i cut the lights 5 mins early than usual, almost like the plants noticed and released some type of smell. I normally smell it through the filter for a min or two at lights out anyways.

Anyone else notice this? It always goes away and starts to smell like skunky weed again.

 

[Brawndo G]

I don't know, but this info may help....

What is the reason for the "planty" smell after lights out?

I have three rooms, a clone/mother/veg room and two flower's. I'm sealed up have negative pressure in each one, carbon filters, 2-3x the needed exhaust cfm and intake, that's all good. But I have always wondered why, more so in veg I've noticed, that I can smell that "planty" smell just after...

www.rollitup.org

"Even though I have not noticed said smell it is most likely due to the plants switching to respiration only and ceasing transpiration activities. While plants respire and transpire when the lights are on, they do not transpire when the lights go off. Respiration is a chemical reaction where organic molecules (mostly sugars) are oxidized to provide energy from the broken chemical bonds. The by products of this are principally CO2 and a small number of oxidized organic molecules. This would produce a small "rush" or organic molecules, some of which are volatile and you could readily smell them. In terms if I can't smell it after 5 mixtures, I would have to attribute that to the phenomenon of human senses, discovery of new stimuli and attenuation of constant stimuli. Meaning that when the smell is "new" you can readily smell it once the body recognizes the smell it rapidly becomes accustomed to it and the intensity rapidly fades."

 

[Milky Weed]

I don't know, but this info may help....

What is the reason for the "planty" smell after lights out?

I have three rooms, a clone/mother/veg room and two flower's. I'm sealed up have negative pressure in each one, carbon filters, 2-3x the needed exhaust cfm and intake, that's all good. But I have always wondered why, more so in veg I've noticed, that I can smell that "planty" smell just after...

www.rollitup.org

"Even though I have not noticed said smell it is most likely due to the plants switching to respiration only and ceasing transpiration activities. While plants respire and transpire when the lights are on, they do not transpire when the lights go off. Respiration is a chemical reaction where organic molecules (mostly sugars) are oxidized to provide energy from the broken chemical bonds. The by products of this are principally CO2 and a small number of oxidized organic molecules. This would produce a small "rush" or organic molecules, some of which are volatile and you could readily smell them. In terms if I can't smell it after 5 mixtures, I would have to attribute that to the phenomenon of human senses, discovery of new stimuli and attenuation of constant stimuli. Meaning that when the smell is "new" you can readily smell it once the body recognizes the smell it rapidly becomes accustomed to it and the intensity rapidly fades."

Thanks bro that makes sense!

 

[calvin.m16]

What are your temperatures and humidity day and night?
Do you notice that your plants smell more sweet and dank with lights on then switch to a more bland/sweet green smell?

Are you using any carbon filters to treat the air or just raw air?