Seedling Update and What is VPD (Vapour Pressure Deficit)?

1 year ago
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cannabis cannabis solo cups uppot cannabis transfer seedlings cannabis seedlings grow weed grow grow weed weed grower weed growers cannabis grower

WEEK 3 - Grow #4 2 OG Kush & 2 Bruce Banner #3s (Photoperiods) SEEDLING UPDATE:
Solo Cups are in the Tent Now.

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If you'd like to help us out and give us some motivation, here is our Patreon Link: https://www.patreon.com/bePatron?u=68432902
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Just a quick update on the 4th grow - and a quick lesson in "Vapour Pressure Deficit" (VPD).

Here's your definition:
https://en.wikipedia.org/wiki/Vapour-pressure_deficit :
"Vapour-pressure deficit, or VPD, is the difference (deficit) between the amount of moisture in the air and how much moisture the air can hold when it is saturated."

Here's a link to a two good charts:
* https://www.dimluxlighting.com/knowledge/blog/vapor-pressure-deficit-the-ultimate-guide-to-vpd
* https://mintropy.com/vpd-cannabis

The girls live downstairs ... and it's Canada... and it's February.

We've made the executive decision to heat the area only to 60 °F | 16 °C for reasons of economy.

At that low temperature, we have to adjust the humidity because when you are growing cannabis in a warmer temperature, you need the humidity higher.

Because we are growing at a lower temperature, we need to keep that humidity a bit lower.

At 60 °F we need to keep the humidity lower than you would think, at about 60% relative humidity - or even lower.

There are also VPD calculators online but they require more input than we have to give them LOL and these charts are a great, handy way to keep the grow environment optimal without getting tooooooo scientific.

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