Live Stoner Chat Barometric pressure

[Itisi]

Hey all

Not sure if this is the right place to post this but...

Here's a thought I had.

Does barometric pressure have any effect on plants?

It's a taken fact that mountain top cannabis is more resinous, it's closer,less protected proximity to the sun is normally given credit for this. But I'm wondering if the lower atmospheric pressure has any bearing on it?

The only reason I'm asking is ,I'm a lazy bugger and have noticed that as the filter on my passive air supply gets dirty the sides of the tent are getting sucked in and I can't be arsed to clean it. I have a manometer and was going to take some readings and calculate what theoretical altitude the tents at (other than 'its in the loft') but as previously stated, I'm a lazy bastard.

Anybody heard anything about this,ever?
Itisi

 

[Eekman]

I don't know about the pressure. But the reason mtn plants get more trichome production is to block sunlight, specifically UV light. The trichomes get thicker/more, for the extra protection that is needed.

Speaking of theories, how come some cannabis with less trichome production, can get you as high, or higher than the more resinious plants. Not always, but sometimes.

 

[Itisi]

I don't know about the pressure. But the reason mtn plants get more trichome production is to block sunlight, specifically UV light. The trichomes get thicker/more, for the extra protection that is needed.

Speaking of theories, how come some cannabis with less trichome production, can get you as high, or higher than the more resinious plants. Not always, but sometimes.

Thanks Eekman.
That doesn't give me the excuse not to clean my filter I was after! Lol.

In answer to theory, maybe it's a THC/CBD profile thing.

Locally I can pick up cheese or amnesia, the cheese looks like it's sugar coated, but it's the amne that fu (#5 me up!

 

[armanidog]

From a research paper:
"Knowledge on air pressure impacts on plant processes and growth is essential for understanding responses to altitude and for comprehending the way of action of aerial gasses in general, and is of potential importance for life support systems in space. Our research on reduced air pressure was extended by help of a new set-up comprising two constantly ventilated chambers (283 L each), allowing pressure gradients of +/-100 kPa. They provide favourable general growth conditions while maintaining all those factors constant or at desired levels which modify the action of air pressure, e.g., water vapour pressure deficit and air mass flow over the plants. Besides plant growth parameters, transpiration and CO2 gas exchange are determined continuously. Results are presented on young tomato plants grown hydroponically, which had been treated with various combinations of air pressure (400-700-1000 hPa), CO2 concentration and wind intensity for seven days. At the lowest pressure transpiration was enhanced considerably, and the plants became sturdier. On the other hand growth was retarded to a certain extent, attributable to secondary air pressure effects. Therefore, even greater limitations of plant productivity are expected after more extended periods of low pressure treatment."
http://www.ncbi.nlm.nih.gov/pubmed/11538810

So basically lower pressure means less productivity in tomato plants. One effect of lower pressure enhanced the plant growth but other secondary effects inhibited plant growth even more.
And a second paper confirms it:

"This paper begins with a brief review of the few reports on methods and results on growing plants at reduced air pressure. Then a new experimental set-up developed by the authors is described and discussed. This set-up permits growth of plants to a total height of 35 cm. Climatic conditions and gas pressures are carefully controlled and CO2-consumption is measured. Results with tomato plants by lowering air pressure to 400 to 700 hPa are reported and compared to plants maintained at 1000 hPa. These studies showed some growth reductions, morphological changes, and enhanced transpiration at 400 hPa".
http://www.ncbi.nlm.nih.gov/pubmed/11537055

 

[Itisi]

From a research paper:
"Knowledge on air pressure impacts on plant processes and growth is essential for understanding responses to altitude and for comprehending the way of action of aerial gasses in general, and is of potential importance for life support systems in space. Our research on reduced air pressure was extended by help of a new set-up comprising two constantly ventilated chambers (283 L each), allowing pressure gradients of +/-100 kPa. They provide favourable general growth conditions while maintaining all those factors constant or at desired levels which modify the action of air pressure, e.g., water vapour pressure deficit and air mass flow over the plants. Besides plant growth parameters, transpiration and CO2 gas exchange are determined continuously. Results are presented on young tomato plants grown hydroponically, which had been treated with various combinations of air pressure (400-700-1000 hPa), CO2 concentration and wind intensity for seven days. At the lowest pressure transpiration was enhanced considerably, and the plants became sturdier. On the other hand growth was retarded to a certain extent, attributable to secondary air pressure effects. Therefore, even greater limitations of plant productivity are expected after more extended periods of low pressure treatment."
http://www.ncbi.nlm.nih.gov/pubmed/11538810

So basically lower pressure means less productivity in tomato plants. One effect of lower pressure enhanced the plant growth but other secondary effects inhibited plant growth even more.
And a second paper confirms it:

"This paper begins with a brief review of the few reports on methods and results on growing plants at reduced air pressure. Then a new experimental set-up developed by the authors is described and discussed. This set-up permits growth of plants to a total height of 35 cm. Climatic conditions and gas pressures are carefully controlled and CO2-consumption is measured. Results with tomato plants by lowering air pressure to 400 to 700 hPa are reported and compared to plants maintained at 1000 hPa. These studies showed some growth reductions, morphological changes, and enhanced transpiration at 400 hPa".
http://www.ncbi.nlm.nih.gov/pubmed/11537055

Thanks Armanidog,

So, in short. I need to clean my filter!