I've watched hundred's of videos. And have read hundred's of articles on this subject. And this video is the best I've seen. By far. Good job. You covered alot more than anyone else. But the reason I've been studying this subject so much, and I can't find ANY INFO on is. First let me give you a little info on my set up. My flowering room is 10'x20'. I have a window a/c unit and a portable dehumidifier. Both work very well in this 120 s/ft area. In my opinion neither one is being over worked to keep this room at the temperature and humidity levels I TRY AND KEEP. And this is where I think a problem may be happening. The a/c keeps the room at the temperature I want. But slowly the humidity will rise. And then the dehumidifier kicks on and lowers the humidity, but makes the temperature rise. So I am constantly getting a 5 to 10 point swing in the temperature and humidity levels. I'm sure this is happening with most growers. But what I'm trying to find out is what kind of effects if any this has on the plants. I'm sure this happens in nature. But not at this degree. This change in temperature and humidity is happening 2 to 3 times a hour. I'm sure it doesn't have to much of a effect, because I've been getting great results for decades. But we all know that one good little adjustment can increase yield and or quality 10 to 20 percent. So I'm hoping you might have some information on this subject. Thanks.
Thanks for the praise on the video content! Regarding your situation additional questions I have are what is your air circulation/venting set-up and where are the sensors placed? Also, is heating needed for this room or is it mainly cooling that is needed to maintain the temperature? Also, what is your method of irrigation? Sorry for all the questions but these will impact the conditions you are asking about. Also, remember, the plants are going to be adding to the humidity as well.
Your room is 200 square feet, not 120. Is your equipment sized correctly? Temperature and humidity will always fluctuate, but to maintain whatever set points you desire, you need to over size the humidity and temperature control equipment to prevent the bigger swings from happening. Also, cheap junk dehumidifiers don’t work nearly as well as a Quest. Quest dehumidifiers are a bit expensive, but they are efficient, and actually work.
Thanks so much for the videos professor! You really do have a gift for explaining things and making them easy to understand. Much appreciation and love from Stroudsburg, Pennsylvania
VPD was never so eloquently explained (to me) before; I actually got it! These graphs are handy. Now, can you direct me to a source of infrared thermometers that fit my budget? Lol! Thanks you so much for your time and effort. Your channel has become "my go to" for all my garden queries! 👍💚✌️
Thanks for the positive comment, glad you can understand the content through the teaching method. Many infrared thermometers that range in price to fit any budget.
Great video! The information is presented in a concise and clear way. I found the infographics particularly helpful for visualizing the key points. Keep up the awesome work!
So this is why I'm getting such slow growth in early veg! Had humidity set to 55% - 60%.. Vdp most of the time about 1.00.. Looking forward to making these changes and seeing the difference. Thanks for the help.. 👍
@@DeBaccoUniversity hey, yeah I've definitely noticed my plants looking healthier even in 2 days. . I've slight issue with my humidifier, it's not 100% accurate. I have it set to 65%, when it comes on it boosts it to 80%. and then slowly drops back to 65%. This cycle takes about 25m.. Vdp is only at 0.95 when it's close to 65%..most of the time of that cycle it's between 0.45-0.75. Thanks for the uploads. I'm from Ireland and appreciate the help.. 👍
Dear Debacco University, I would love to share some of your videos on my other platforms you always do such a great job breaking down your findings with detailed analysis you guys and gals rock!!!
I think a good general rule is to have the humidity about 20 lower than the temperature. It's not prefect, but it's pretty close in the ranges that people grow cannabis.
Professor, what about when the lights are off? Should the vpd be maintained in the same range as when lights are on? Thanks for the detailed, comprehensive and educational videos. Keep up the great work!
great video, although you didn't cover measuring for VPD and how leaf surface temp affects the number. The charts in the video are off, because they don't account for LST. In mid flower I run ambient 90, LST- 85, so humidity is set to 53% to keep me at 1.4 VPD. No worry of bud rot or mildew at those numbers.
You mentioned transpiration increasing as wind velocity increases (fan blowing onto plant) so is it advised not to have a fan blow onto your plant in veg when VPD is around 1.0? Wind velocity doesn't directly affect VPD but id be interested to hear your take on this:)
Technically from a VPD stand point wind makes little difference, but yes more air circulation would be advised if other environmental factors could not be modified.
Not sure if you saw this DeBacco University video... ua-cam.com/video/hZiAzcYdDsM/v-deo.html but no direct leaf temp comparisons but LED will be lower than HPS.
@@DeBaccoUniversity yes I did. :) Can heat causes hermaphrodite? Seems a few places are saying it can causes fem to turn herms because of the heat... So, if we have to get higher temp because of LED, we have to be even more careful about the breeders we pick our seeds from. Or it's an easy thing to say because stability isn't on the table anymore :( Also, with new LED generation, they started to add IR led, I'm wondering if it can raise the leaf temp a bit. I have to buy a new thermal camera or IR gun but the ir gun are somewhat unreliable :| So if raising humidity, I guess it raises the internal temperature of the leaves since evaporation is lower. I took some measurements and well, I even saw some 65-68F temp! Water temp is at 70 (dwc) Thanks again for all those informative videos! really nice job! :)
What about lights off VPD? If your supplementing with Co2 canisters or bags, would a low VPD when the lights are off be more beneficial or is VPD recommened to stay consistent throughout a 24 hour period in range with the stage of growth?
@@DeBaccoUniversity just going back to a previous slide on the video it says that a lower VPD will open up the stomata's making it easier for the plants to uptake Co2, so would it be more beneficial if your supplementing Co2 to have periods of low VPD? Sorry if the question was un clear thanks for clearing up the other question and getting back to me about the VPD being consistent throughout the cycle depending on stage of growth. Thanks for all the knowledge and helping me understand how to grow plants to the best potential they can big love debacco
How does light intensity affect vpd requirement? If you were in a warm but low light environment or a cold but high ppfd environment, how would that affect the plant, its transpiration and nutirional requirement?
Take the temperature and humidity environmental factors to have the greatest impact on the general VPD. Not only light intensity, but air flow and carbon dioxide concentration will all impact stomata opening and closure, but these are details compared to the temp. and humidity. Hope this helps.
Your recommending and promotion of the channel is very much appreciated! Thanks to you (and others) for spreading the word about the channel, it because of this the subscriber count is on the rise which is great to see the acknowledgment of quality content.
I run 2 thermometers at different levels. One at canopy level, another over the light. My exhaust fan is on a sensor from the latter. But Im not running CO2..
Hello, i have a tent outside that is hard to cool down when it’s hot outside, so if it’s 90 degrees in there, should i match it with the corresponding humidity (75%) or is that too humid since my plants are in late flower?
Goal 1 would be to reduce temperatures, second enrich with CO2 as plants are tolerate 90F better than at ambient conditions, increasing humidity would likely cause other issues.
So i should follow vpd instead of going my whole grown at 25-30°c and arround 60÷ humidity, tim asking since i saw some ppl that said thatthose number gives the most amount of yields
Proper VPD management will help maximize plant performance. Keeping conditions consistence can help establish a growing pattern, which can provide a good starting point to understand plant growth and behavior.
All well and good information but they only thing that you didn't tell us which probably the most important factor as all the rest is pretty much h common grow knowledge. The question is what the leaf temp should be.
Not well versed in this, but this source should help you out... hempindustrydaily.com/this-elusive-pathogen-is-damaging-hemp-nationwide-heres-how-to-fight-it/
VPD charts or calculators without LEAF TEMPS are useless. The "D" is the deficit or differential (difference between) air temp and leaf temp, air relative humidity and internal leaf humidity (which is 100%).
Thanks Mike Pesanski for your comment and subscription! Quality content is always the goal because of the support and realization of the importance by people like you!
Short version new growers will understand.. Plants sweat..kick off preperation.. I dont do nerd talk for cannabis..sorry guy.. Just Google plants sweating. Funny thing is I did a video on plants sweating few days ago before this video... Wonder what made you do this video, since you dont grow cannabis..I think I know why..
For someone who "does not do nerd talk for cannabis" and does not trust the growing skills presented it is great to see you adding comments on the channel and within 24-hours of the video being posted.
@@joshtaylor8770 you are entitled to your opinion..as far as get over myself..you just dont get it. Not all of us are gullible newbies. All these videos and not 1 grow or plants from him..ok.. He could even grow hemp with 3% thc if he lives in America. Some people like to learn from a teacher,like class in high school.. Others like myself like to see a product of plant in different stages.. Do you even grow cannabis yourself?? And its questionable on the timing of this video..I did video on plants sweating 3 days before this video . When there isn't hardly any videos on plants sweating, and someone who has tons of cannabis videos, does a video basically on same plant situation Days after you.common sense would say maybe he saw my video. Content isn't easy when you dont actually grow.... And its nothing against channel owner.. There is a bigger picture here and you just dont see it. Reason why that is.you dont do cannabis videos yourself..
Thank you Josh Taylor for the support, it is greatly appreciated to know there are people like you out there! It is easy to post comments but hard to produce content, and if people think a competing video of this quality could be produced in 3 days they do not recognize the time put into the information presented. (Never mind the over a month of posting at least two videos a day.) Also, DeBacco University is not monitoring the commenters channel, it is the other way around.
This is a top tier cannabis gardening channel and it doesn't have enough exposure.
Top tier comment here;-)
I've watched hundred's of videos. And have read hundred's of articles on this subject.
And this video is the best I've seen. By far. Good job.
You covered alot more than anyone else.
But the reason I've been studying this subject so much, and I can't find ANY INFO on is.
First let me give you a little info on my set up.
My flowering room is
10'x20'.
I have a window a/c unit and a portable dehumidifier.
Both work very well in this 120 s/ft area.
In my opinion neither one is being over worked to keep this room at the temperature and humidity levels I TRY AND KEEP.
And this is where I think a problem may be happening.
The a/c keeps the room at the temperature I want.
But slowly the humidity will rise. And then the dehumidifier kicks on and lowers the humidity, but makes the temperature rise.
So I am constantly getting a 5 to 10 point swing in the temperature and humidity levels.
I'm sure this is happening with most growers.
But what I'm trying to find out is what kind of effects if any this has on the plants.
I'm sure this happens in nature. But not at this degree.
This change in temperature and humidity is happening 2 to 3 times a hour.
I'm sure it doesn't have to much of a effect, because I've been getting great results for decades.
But we all know that one good little adjustment can increase yield and or quality 10 to 20 percent.
So I'm hoping you might have some information on this subject.
Thanks.
Thanks for the praise on the video content!
Regarding your situation additional questions I have are what is your air circulation/venting set-up and where are the sensors placed? Also, is heating needed for this room or is it mainly cooling that is needed to maintain the temperature? Also, what is your method of irrigation? Sorry for all the questions but these will impact the conditions you are asking about. Also, remember, the plants are going to be adding to the humidity as well.
Your room is 200 square feet, not 120. Is your equipment sized correctly? Temperature and humidity will always fluctuate, but to maintain whatever set points you desire, you need to over size the humidity and temperature control equipment to prevent the bigger swings from happening. Also, cheap junk dehumidifiers don’t work nearly as well as a Quest. Quest dehumidifiers are a bit expensive, but they are efficient, and actually work.
These videos are packed with concise cannabis knowledge in short videos that suit my limited attention span !
Thanks for sharing great to know the information is appreciated.
Keep the videos going Debacco! I don't know about anyone else, but I definitely appreciate them!
Great to hear you appreciate the videos, be sure to share them with other like minded people!
Thanks so much for the videos professor!
You really do have a gift for explaining things and making them easy to understand. Much appreciation and love from Stroudsburg, Pennsylvania
Stroudsburg, Pennsylvania you are welcome!
DeBacco wow I literally was just searching this topic and here we are! Epic irony you just posted
DeBacco University is always happy to provide the content you need, when you need it;-)
The algorithm knows what we want!!👍
VPD was never so eloquently explained (to me) before; I actually got it! These graphs are handy. Now, can you direct me to a source of infrared thermometers that fit my budget? Lol! Thanks you so much for your time and effort. Your channel has become "my go to" for all my garden queries! 👍💚✌️
Thanks for the positive comment, glad you can understand the content through the teaching method. Many infrared thermometers that range in price to fit any budget.
well done - like all your vids, thanks! tons of great, useful info!
Much appreciated!
Great video! The information is presented in a concise and clear way. I found the infographics particularly helpful for visualizing the key points. Keep up the awesome work!
Glad you enjoyed it!
So this is why I'm getting such slow growth in early veg! Had humidity set to 55% - 60%.. Vdp most of the time about 1.00.. Looking forward to making these changes and seeing the difference. Thanks for the help.. 👍
You should see an improvement;-)
@@DeBaccoUniversity hey, yeah I've definitely noticed my plants looking healthier even in 2 days.
. I've slight issue with my humidifier, it's not 100% accurate. I have it set to 65%, when it comes on it boosts it to 80%. and then slowly drops back to 65%. This cycle takes about 25m.. Vdp is only at 0.95 when it's close to 65%..most of the time of that cycle it's between 0.45-0.75.
Thanks for the uploads. I'm from Ireland and appreciate the help.. 👍
There’s A ton on Information in this Video, Thanks for tanking the time to really break things down 😊
Thanks for the comment and subscription.
Thanks for the video. Always learning, putting more puzzle pieces in line!
Glad to help with the pieces, just a word of warning..... this puzzle has a lot of pieces;-)
Uploading a video on my C02 emitting bag by Michigan mushroom company plants are going bonkers with growth amazing
Thanks for sharing your experiences.
Dear Debacco University, I would love to share some of your videos on my other platforms you always do such a great job breaking down your findings with detailed analysis you guys and gals rock!!!
Sure you are welcome to share the videos, encourage your views to subscribe the channel is all that is asked in return.
You bet, I have learned so much from your insightful videos thank you for sharing. @@DeBaccoUniversity
Thanks so much!!! Concise, accurate, and short
Glad the information and presentation were both enjoyable.
Very well explained thank you!
Thank you, be sure to share the channel with others!
Awesome video, you explained this perfectly. Thanks professor DeBacco, I love the videos!
You are welcome and I appreciate your positive comment!
Thanks this a very good explanation of the vdp,,, definitely will share this knowledge again thanks
Your comment is appreciated as well as your willingness to share the content on this channel with others.
Best explanation so far Thanks
Always great to know quality content is provided.
An excellent presentation!
Thank you
You are welcome!
I think a good general rule is to have the humidity about 20 lower than the temperature. It's not prefect, but it's pretty close in the ranges that people grow cannabis.
At least with this general guide growers will be considering VPD.
Great video, very informative.
Great to know you found it helpful thanks for commenting!
This was great info🔥🔥🔥👌💯
You are welcome!
Excellent♨️
Thanks for taking the time to comment!
Hi, great video. What's the reason for the plateau as T rises?
Limitations of a biological system (enzyme limited).
@@DeBaccoUniversity Interesting! Makes sense, thank you.
Professor, what about when the lights are off? Should the vpd be maintained in the same range as when lights are on? Thanks for the detailed, comprehensive and educational videos. Keep up the great work!
No as important, but still advised.
Amazing video !
Thanks for providing the comment!
Thank you so much!!!
You are so welcome!
Thanks for the info.
Thanks for the comment.
What are the ideal conditions for flowering while using co2? In terms of PAR,VPD and ppm of co2?
This DeBacco University video may be helpful for you... ua-cam.com/video/au7G-oVDeKg/v-deo.html
I love you content, thank you
You are welcome!
so what do you do with leaf temp i dont understand ive been monitoring vpd by air temp and humidity . how do i use the leaft temp in this situation?
great video, although you didn't cover measuring for VPD and how leaf surface temp affects the number. The charts in the video are off, because they don't account for LST. In mid flower I run ambient 90, LST- 85, so humidity is set to 53% to keep me at 1.4 VPD. No worry of bud rot or mildew at those numbers.
Thanks for sharing your experience and details.
85/53 is to dry. 80/60 is 1.3. at 53% RH you'd want more like 74 degrees. Just going off my experience.
You mentioned transpiration increasing as wind velocity increases (fan blowing onto plant) so is it advised not to have a fan blow onto your plant in veg when VPD is around 1.0? Wind velocity doesn't directly affect VPD but id be interested to hear your take on this:)
Air movement is important, key is the leaves should be moving slightly and not aggressively to help reduce disease and not impact VPD that much.
Given that high humidity slows transpiration, in a very hot humid environment would it benefit the plants to have more wind?
Technically from a VPD stand point wind makes little difference, but yes more air circulation would be advised if other environmental factors could not be modified.
Excellent videos! I was wondering if you ever compare leds vs hps when it comes to leave's temperature?
Not sure if you saw this DeBacco University video... ua-cam.com/video/hZiAzcYdDsM/v-deo.html but no direct leaf temp comparisons but LED will be lower than HPS.
@@DeBaccoUniversity yes I did. :)
Can heat causes hermaphrodite? Seems a few places are saying it can causes fem to turn herms because of the heat... So, if we have to get higher temp because of LED, we have to be even more careful about the breeders we pick our seeds from. Or it's an easy thing to say because stability isn't on the table anymore :(
Also, with new LED generation, they started to add IR led, I'm wondering if it can raise the leaf temp a bit.
I have to buy a new thermal camera or IR gun but the ir gun are somewhat unreliable :|
So if raising humidity, I guess it raises the internal temperature of the leaves since evaporation is lower. I took some measurements and well, I even saw some 65-68F temp! Water temp is at 70 (dwc)
Thanks again for all those informative videos! really nice job! :)
What about lights off VPD? If your supplementing with Co2 canisters or bags, would a low VPD when the lights are off be more beneficial or is VPD recommened to stay consistent throughout a 24 hour period in range with the stage of growth?
VPD does not change with lights on or off or with or without CO2... however the temperature often changes so follow the graph target ranges.
@@DeBaccoUniversity just going back to a previous slide on the video it says that a lower VPD will open up the stomata's making it easier for the plants to uptake Co2, so would it be more beneficial if your supplementing Co2 to have periods of low VPD? Sorry if the question was un clear thanks for clearing up the other question and getting back to me about the VPD being consistent throughout the cycle depending on stage of growth. Thanks for all the knowledge and helping me understand how to grow plants to the best potential they can big love debacco
How does light intensity affect vpd requirement? If you were in a warm but low light environment or a cold but high ppfd environment, how would that affect the plant, its transpiration and nutirional requirement?
Take the temperature and humidity environmental factors to have the greatest impact on the general VPD. Not only light intensity, but air flow and carbon dioxide concentration will all impact stomata opening and closure, but these are details compared to the temp. and humidity. Hope this helps.
Understood, thanks
Glad it helped!
Cheers mate. Good, clean basics without the BroScience. Recommending to my newer growers. :)
Your recommending and promotion of the channel is very much appreciated! Thanks to you (and others) for spreading the word about the channel, it because of this the subscriber count is on the rise which is great to see the acknowledgment of quality content.
Hi where the best place to put the thermostat in a grow tent ? Under or over the light?,
This DeBacco University video will help you... ua-cam.com/video/07W4N8BXM80/v-deo.html
I run 2 thermometers at different levels. One at canopy level, another over the light. My exhaust fan is on a sensor from the latter. But Im not running CO2..
Debacco, the only university I want to be
Welcome and thank you for the high praise!
@@DeBaccoUniversity
Growing cannabis will be legal in Germany, so I need to be prepared 😁😁
Will led lighting affect transpiration rates? I have been struggling with led lights and getting overwatering issues
LED lights typically produce less leaf temperature which impacts the transpiration rates which can result in water issues in the root zone.
Succinct & to the point, great info.
This is the goal of the channel, but this is actually quite a challenge to accomplish. Glad you liked it!
Hello, i have a tent outside that is hard to cool down when it’s hot outside, so if it’s 90 degrees in there, should i match it with the corresponding humidity (75%) or is that too humid since my plants are in late flower?
Goal 1 would be to reduce temperatures, second enrich with CO2 as plants are tolerate 90F better than at ambient conditions, increasing humidity would likely cause other issues.
So i should follow vpd instead of going my whole grown at 25-30°c and arround 60÷ humidity, tim asking since i saw some ppl that said thatthose number gives the most amount of yields
Proper VPD management will help maximize plant performance. Keeping conditions consistence can help establish a growing pattern, which can provide a good starting point to understand plant growth and behavior.
@@DeBaccoUniversity Thank you very much sir✌🏽
How to keep VPD in target range?????
Regulate the environment.
All well and good information but they only thing that you didn't tell us which probably the most important factor as all the rest is pretty much h common grow knowledge. The question is what the leaf temp should be.
Based on the temperature, the target humidity will vary (see chart). In addition consider your lighting source (HPS or LED).
Detroit Michigan 48221. Thank you very much. I sub, liked and commented : Video paid for.
Your subscription and comment are appreciated, hopefully it encourages others to do the same!
Have You ever heard of hopp latent viriod
If so could you share your knowledge of it
Not well versed in this, but this source should help you out... hempindustrydaily.com/this-elusive-pathogen-is-damaging-hemp-nationwide-heres-how-to-fight-it/
Me watching this video to find out I perfected VPD without even knowing what it was: 👁️👄👁️
Sometimes you get lucky;-)
Great fucking 📹!!!!
While your enthusiasm is appreciated, please keep your language professional.
@@DeBaccoUniversity np
VPD charts or calculators without LEAF TEMPS are useless. The "D" is the deficit or differential (difference between) air temp and leaf temp, air relative humidity and internal leaf humidity (which is 100%).
The equation is shown at 0:33
Algorithm
Thanks!
VPD lmao
It is an important concept to maximize production.
@@DeBaccoUniversity worrying about trivial shit won’t get you there! Grower talent and the willingness to top and shape the plants will!
@@DeBaccoUniversity subscribed!!
Please continue to put out quality content.
You're over the target when the haterade bro science clowns show up
Thanks Mike Pesanski for your comment and subscription! Quality content is always the goal because of the support and realization of the importance by people like you!
Worrying about VPD means you’re a plant killer and have lost 😞
Lol @ maybe more details than you care to know
Wanted to provide this disclaimer;-)
Short version new growers will understand..
Plants sweat..kick off preperation..
I dont do nerd talk for cannabis..sorry guy..
Just Google plants sweating.
Funny thing is I did a video on plants sweating few days ago before this video...
Wonder what made you do this video, since you dont grow cannabis..I think I know why..
For someone who "does not do nerd talk for cannabis" and does not trust the growing skills presented it is great to see you adding comments on the channel and within 24-hours of the video being posted.
Get over yourself dude. This guy is amazing and you know it. That's why you are projecting feelings of fear and inadequacy.
@@joshtaylor8770 you are entitled to your opinion..as far as get over myself..you just dont get it.
Not all of us are gullible newbies.
All these videos and not 1 grow or plants from him..ok..
He could even grow hemp with 3% thc if he lives in America.
Some people like to learn from a teacher,like class in high school..
Others like myself like to see a product of plant in different stages..
Do you even grow cannabis yourself??
And its questionable on the timing of this video..I did video on plants sweating 3 days before this video .
When there isn't hardly any videos on plants sweating, and someone who has tons of cannabis videos, does a video basically on same plant situation Days after you.common sense would say maybe he saw my video.
Content isn't easy when you dont actually grow....
And its nothing against channel owner..
There is a bigger picture here and you just dont see it.
Reason why that is.you dont do cannabis videos yourself..
Thank you Josh Taylor for the support, it is greatly appreciated to know there are people like you out there!
It is easy to post comments but hard to produce content, and if people think a competing video of this quality could be produced in 3 days they do not recognize the time put into the information presented. (Never mind the over a month of posting at least two videos a day.) Also, DeBacco University is not monitoring the commenters channel, it is the other way around.
@@DeBaccoUniversity This content is grade A. I'm just calling it like I see it. Keep up the good work!