VPD Too High?
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- Опубліковано 9 лип 2017
- So you've taken your grow room's temperature, relative humidity and leaf temperature and calculated your VPD or vapor pressure deficit. Or perhaps you've checked a VPD chart and seen that your indoor garden's VPD is too high? Now what? This video is all about what a high VPD does to your plants and how you as a grower can respond.
Download VPD Spreadsheet: opennlabs.com/vpd/VPD_SPREADSHEET.xlsx - Навчання та стиль
Absolutely incredible volumes of information on growing on your page and this video has been a life saver explaining exactly what was wrong with my plants and how to fix it!!!! Cant thank you enough!!!
Love the speed, humor and the sheer amount of information. Thank you.
Thanks Zach :)
Mr. Fernandez Thank you so much for teaching us about VPD. I'm sure we have all learned a great deal from your efforts.
I see so many grows being posted on social media that have this problem.
Love the channel! Can't believe how much information is packed into each video! You're the man Everest!
Always nice to watch a video from someone who knows what they are doing. THanks!
You're welcome Jeb-good to have knowledgable and engaged viewers too! Thanks for your positivity and support.
This is probably the best VPD video on UA-cam, thanks.
I really like your videos even though I just have a small outdoor garden. one day I will use your info to the full potential.
thanks so much for your videos man! thank you for your work. i cant stress this enough. thanks.
Muchos apreciamos!
Xen626 agree totally this can't be stressed enough have learned alot from Everest
cool man good to see you back...love the films
excellent stuff been watching stroner grow videos and yours blew them all away very good easy to understand information!!!
Glad you enjoyed the video. Appreciate the feedback. Have a great day William an best of luck with your grow.
Great Video looking forward to the Low VPD follow up.✌
Well explained! Thanks Everest! ✌
Thanks so much, vpd under control!
Can't thank you enough for this valuable information! I've become a better grower because of it! Cheers from Canada!
That’s fantastic to hear. Makes it all worth while to know you found the vid useful. Thanks :)
Very interesting and helpful EV! THANK YOU SO MUCH
Been watching videos for a year. This is definitely a helpful video. Who knew?!?!?
Thanks Yak. Please subscribe!
Everest Fernandez between the TV, Ipad, and phone the subscription keeps popping off. Likes too. I'll sub once again! (And I have 2 UA-cams- which is enough to confuse me. LoL 😂
Thanks to really explain how to deal with VPD
Glad you enjoyed it. Thanks for the feedback.
it's interesting since my vpd is better this time than last times 2+ vpd, I've gotten below .1 & keep it around .98 but never knew how because no one seemed to know. thanks. still so much to learn.
Spraying walls and containers trays of water in tents are very good advice!
i see these symptoms all the time. thanks for the literate description of what exactly is going on. Ill be bach
I have watched your video and it is great. I found the explanation for some problems I started to have with necrotic spots. I forgot to turn the humidifiers and my strawberry plants were about 30°C with a 10% humidity for 6 hours. My question is if the necrotic spots, tipburn are reversible. Thanks
Oh shit! I started tracking my vpd and realized the issues I’ve been seeing with my cannabis makes so much more sense.
dude! right on. my hero. i was thinking not enough nitrogen, or zinc, or phosphorus.
Everest, I grew a plant in a 5 gallon container of soiless organic mix, then when the roots started to pop out the bottom drainage holes, I placed the entire container ontop of a 5 gallon bucket, filled with aerated water, turning it into a dwc system. Everything grew really well, despite some excess transpiration issues, I was wondering if you could try the same thing to see if you get similar results.
O I wish I knew what you do .....I don't even know what you are talking about half the time ...... but i feel so clever when I go and repeat what I've heard from you 😂😂😂😂😂 thanks for that !
That's the problem with the growing game. Lots of parrots
They have these awesome things called smart humidifiers. Made a world of a difference for my tent
Awesome video as always :) I got a question, do you have a link/reference to how much ppm fertilizer is needed for what length of time per crop? Like, if I had a 100,000L tank with 400ppm fertilizer that's recycled back into the tank, how many individual plants would it feed for their whole life cycle??
i needed this video THANK YOU SIR
I appreciate you taking the time to comment! Thanks for the feedback and happy growing! :))))
Hey man, badass video, thanks.
You, sir, are most welcome! Thank you.
awesome like always.
Thanks for the great info, on point as always👍👍
Enjoying your channel updates-great vibe.
Honored to have you watching #growerslove
best VPD video out there
i just subrcribed my ninja you deserve more if i wasnt so broke id buy your books whatever ,,,you rock!!!!
What’s the best vpd for plants in veg and bloom?i know there’s a big difference in the two
Thank you. Great video, I now understand the full thing. Growers Love
Coming right back at you H-Smurf!
I'm just starting to learn the importance of VPD and this video has literally shown me all of my problems (both indoors in arid winter and out doors in brutal Australian summer) were from too high VPD! I have been trying to lower my current indoor VPD and this should have all the info for me to do it! Just wondering if you ever did a 'VPD too low?' video? This isn't an issue for me (right now) but it would be great to see both the effects on plant growth and ways to influence it in your presentation style.
Thanks amigo, VPD too low is on the list!
@@Just4Growers fantastic! I'll be sure to keep an eye out!
Hey Everest! Great video as always! I have to ask, do you retain all the information that you teach in your videos or is some of it derived from specific research done for each video? Just curious, thanks again!
Hi Tony-as a dedicated, full-time plant researcher, I am constantly learning-through books, research papers, colleagues and-last but definitely not least-field experience! As for the videos, I always try to go the "extra mile" and be definitive-to provide something solid, rather than merely anecdotal. To this end, I check what's already out there in respected, peer reviewed scientific journals and then attempt to digest it all and turn it into an accessible concise video that anybody can watch and learn from. For this VPD video I read "Measuring Vapor Pressure Deficit in the Field", R.L. Snyder and K.T. Paw U, from UC Davis, California as well as several other papers. I also consulted with colleagues in the industry who were super generous with the time and insights. Merely saying "VPD can be calculated using mathematical formulas" - as some growing magazines have stated and reproducing a screenshot of a chart (the one I helped to produce for Urban Garden Magazine ten years ago is still doing the rounds online!) just doesn't cut it. I felt it was important, in a video seeking to define VPD, to state the formula explicitly so that viewers of a scientific gait can have their curiosity fully sated and understand how the figures are actually arrived at. However, I would like to add / caveat that, while I want these vids to be "complete", I see them really as a starting point for discussions rather than the last word! My goal is to make life easier for new growers. We were all beginners once! No need for horticultural gnosticism! :)
thanks. finally got it.
I have great success with a humidifier in my tent. Put it on its lowest setting, and set your filter fan to its lowest speed. Humidity stays witht 2% of where I set it with minimal fluctuations. VPD stays dialed in nicely.
So if my vpd is to high I want to add a tray of water to raise the humidity level? And where can I get a copy of the video chart you spoke of
I have recently come in to this problem with my plants so thanks a lot for this information. I do have a question for you though. I never had these problems when I used to grow with T5 bulbs in veg and 1000W HPS in flower ( Same dry environment, same nutrients ) but when I switched to this 480W quantum board (3000k) I've had these problems twice now under the exact same type of environment. Any idea why LED seems to be more prone to these VPD issues? Again thank you very much you've got a new subscriber.
Rawb as fsr as i know the led quantam boards cause the plants to eat more calmag than your t5 or hid light does. So check that
Can you suggest any books to read about VPD?
Hey man loooove your clean work. So heres my question, I noticed some twist on the middle fan leaf of my vegging plants. Any idea what that may be? I grow 5 strains, all started doing the same thing and it has me stumped. I started seeing that when I switched to sealed room thinking the higher humidity in my case has caused some stagnation concerning nutrients in the medium due to slow transpiration. Lmk what you think and thanks.
+thatsjaybaby Ola amigo. Thanks for your +vity and encouragement. What is your RH running at during the day? Are you running a dehumidifier? What about CO2? What PPM are you running? And do you dump the CO2 at lights out and bring fresh air into your garden for the night cycle? We will get to the bottom of this amigo! Peace and happy growing, Everest.
Everest Fernandez thanks for the reply. OK. To address your questions, I aborted my original plan to run sealed because of what looked like a deficiency but I suspect a lock out due to the high humidity. The problem seems to be correcting somewhat and maybe the plants are just recovering. Anyways, the humidity is about 45% my temps are running at 82° I don't know how the extraction fan 24 seven. The plants look much better maybe I figured it out was just looking for your opinion. I do want to supplement with CO2 ASAP but not until I can dehumidify it seems.
awesome amigo
Something finally 'clicked' for me! Thanks, VPDs been illusive . I've one question: do you use actual leaf temperatures or simply adjust the calculation
VPD @ 58 or so. I have a self watering pot with about 10 gallons of water, then potting soil, then planted are some potato vines. I added some Miracle Grow to the water. I am in Phoenix Arizona and it gets hot as hell. My pots are outside so no way to control the temp or humidity. I have the condition you speak of when too much water is brought up and too much calcium blocks nutrients. In the case where you cannot stop high heat and low humidity, can you change the water chemistry to help?? Like maybe high PH distilled water with only certain nutrients? Suggestions would be helpful. Thanks.
Check out my video on VPD here amigo - Humidity 102: Vapor Pressure Deficit - VPD Chart - and let me know what number you end up with.
Great videos! Will you be doing a video on low VPD?
I certainly will. :)
Wow... Thank you.
Spot on!
Thank you friends!
Does this apply when the lights are off?
You can get a small (computer) fan blowing on the solution, where the (DWC) plants sit in, with another hole letting moist air out. Whit this you have to top up your solution a little more often, but it's a very cheap solution for your humidity problem. Last but not least it keeps the temperature of your solution at least 2 degrees C lower
I'm spot on! yay VPD ftw
Your best video
Thanks Elliot. I must make “VPD Too Low” too - it’s on the list, just got a few to do first.
Everest Fernandez keep up the good work. Question, if my canopy temp is 25-30c (I used a thermal camera) most of the canopy being 27-28 only the buds glowing at 30c. Should I match the humidity to VPD. And what chart should I use because they all say different things depending on who made the chart.
Very good and informed content. holy smokes you talk fast!
wow I think that's what happened to my strawberries... i had what looked like leaf burn but on the stems of the leafs... doesn't Epsom salt help a little?!
Epsom salts will put more magnesium and sulfur ions into solution - if your VPD is too high, adding more solutes will probably exacerbate rather than remedy the situation. What media are you in? Not sure if you're outside or inside, but if you can give your plants a little shade (assuming your temperatures are too high) and water through with a milder nutrient solution (or just water if in soil) it could help see them through. Some misting to increase localised RH may help too.
Why do humidifier’s not work well is small grow tents? I have fruiting / flowering citrus trees in a 4 x 4 a grow tent. The VPD is definitely too high. I was all set to remedy the problem with an Ideal Air 75 pint humidifier. Sounds like overkill but I think 75 is the smallest humidifier Ideal Air sells. Why is this not a good idea in a small grow tent?
I want to thank you for your real world example. They may have saved three of my citrus tree. I ordered some fans and was about to feed them some citrus tome but after watching your video I see how important it is for me to fix the high VPD problem first before I add nutrients and switch the fans on.
thanks
How does nature regulate VPD?
I have a flower and veg tent in the same room. I have a dehumidifier running to bring down humidity to the right levels of around 40-50% humidity for my flowering tent. It works great but I need my veg tent to be in the 60-70% range. Can I stick a humidifier in my 2x4 veg tent to get the humidity to the right level? Why did you say they don't work well in small tents? I would really appreciate any help on this. Thank you!
Hey amigo-it wouldn't work with the humidifier I have because the vapor it produces isn't fine enough. Try something like the "Mist Maker" - www.growell.co.uk/fans-filters-environment/humidity/mist-maker-humidifiers.html - much better suited to small grow tents. I'll be checking out gear like this soon.
Everest Fernandez Thanks so much for answering brother! I actually just ordered an evaporative humidifier from Amazon because it doesn't produce any mist at all. Do you think that will work ok or should I return it and get what you recommended? Here is a link to what I got. www.amazon.com/gp/aw/d/B00O0WOO74/ref=mp_s_a_1_3?ie=UTF8&qid=1499955466&sr=8-3&pi=AC_SX236_SY340_FMwebp_QL65&keywords=evaporative+humidifier&dpPl=1&dpID=41tVKyvqN1L&ref=plSrch
If you get a chance can you please let me know if you think it's ok to use. Thank you for all you do! Your videos are so helpful.
I'm very curious about oxygen diffusers using electrolysis vs air pumps they are claiming 30% yield increase. I have not seen any proof of this. also the electrolysis method is said to release heavy metals into the water. my question then is if it is a significant enough amount to be concerned about? or would regular resivor changes take care of that. what effects would that have on your PH/Nutrients?, and should you even bother with oxygenating water in an ebb and flow system. thanks again for your expertise.
Probably wouldn't be a problem if you use RO water, no heavy metals then?
+ConstitutionallyConscious Thanks for your comment. I am yet to be convinced by the use of electrolysis to oxygenate a nutrient solution. (That said, I have only tried it once.) electrolysis is going to release twice as much hydrogen as oxygen. Further more: Nitrates, phosphates, sulphites etc will go to the cathode while metals (including those required by the plant - iron, copper, zinc) will go to the anode. In both cases making them unavailable to the plant. I have been electrolyzing a nutrient solution for several weeks now and will send it to the lab for testing to prove it!
Everest Fernandez Thanks again for ur expertise, that's why I asked the pro.
Interesting, it'll be exciting to know what results you come up with, many thanks!
I will let you know when I get the dissolved oxygen 101 video up.
can you do the opposite(increase my nutrient solution) if your vpd is to low?
Yes you can.
Commercial chili farmers, for example, starting their plants off early in cool, humid greenhouses in spring sometimes feed their plants very strong nutrients at first to make up for the low VPD.
Thanks Everest 👍 What happened to low VPD ?
Andy green Thanks for the reminder. It’s been underlined on the list!
🌱💚👊👍 Keep doing what your doing my friend simply love your enthusiasm 👍👍👍
Already got low VPD in the works - when you see that video appear you should feel a little bit responsible. Lol. Thanks again for the prod!
Wappened to VPD too low? I don't see it in your vidyos, didja not get to it?
It's coming! :)
Learning all this makes me feel like I'm climbing Mt. Everest.
Always happy to help amigo.
Yeah Mt. Everest Fernandez lol
Never had vpd problems in 25 year's, never even heard of it before.
Pleased to hear it! But if you ever experienced issues with relative humidity being too high or low, or temperatures being too high or too low, you have in fact experienced VPD issues, just labeled differently. :) peace and happy growing, Everest.
@@Just4Growers The humidity were I am is 75% outside I have no idea what it is indoors I have chilli plants that look a bit like they do in this video because of over watering, I cut back on watering and they are getting healthier.
I'm to tight to buy more gadgets.
@@Just4Growers I do partial root zone drying that helps.
Good grief take a breath!! I can’t watch but a few minutes of this without feeling like I was over dosing on caffeine and speed!
If my VPD is too low, primarily due to a low leaf temperature, are there other solutions besides lowering the lights? Temps are around 25C and 50-55% RH with lots of air circulation. Thanks!
+Pete Steimer Hi Pete, thanks for your question. VPD is based on the following factors: relative humidity, leaf temperature, air temperature and air movement. If you want to increase your VPD you need to: increase your leaf temperature, increase your air temperature, lower your RH, or increase your air movement. To increase your leaf temp / air temp you could add a heater or use a light source with more infrared / radiant heat. You could also use a dehumidifier to reduce your RH to, say, 40%.
I’m sorry man, I thought I was understanding…but in this example, Pete says that he’s got a low VPD, with 25ºC & 50-55% RH. Isn’t that a high VPD of 1,24 to 1,4 (assuming leaves at -1ºC than air temps) ?? Thats good high VPD to mid / late flower right? I guess it depends on what you want but I think a bit higher than that its gonna take you out of the sweet spot of the chart. Great vids by the way, new fan here of your channel amigo
It took me way too long to figure out how important vpd is. I look back at some of the battles I fought against lockouts and toxicity and I feel so dumb 😅
I totally feel that. Once you get that penny drop moment of plants being subject to their environment and the ‘moisture sucking’ effect of the air (or not!) then you can be far more proactive (and responsive) as a grower.
When he said "some greenhouse growers wet the floor" i thought he was speaking metaphorically, just for a moment there...
Sooo.... I'm NOT supposed to pee on the floor?
🤙👊🤟
Fantastic video! very informative, however you talk a little too fast. I had to slow the speed down lol
Thanks for the feedback BW! I sound pretty well-medicated on slower speeds ey? :)
u need to lurn how to feed flush!
This is a problem I have.need to study
VPD? Can you Explain it Easier?
+Mohsen Aghdam High VPD = air dries your plants and forces them to uptake more moisture, low VPD = air is moist and plants find it hard to transpire and lose moisture.
Everest Fernandez Thank you Everest,you are my Hero❤️❤️👍🏽👍🏽
VPD too low :(
you never did a VPD too low eh
Guilty as charged. I’ll do it.
@@Just4Growers haha good work with the playlist, i have shared it with a few people already, good job
No, your plants did that because you stabilized the tomato cuttings as 'hydroponic' plants. You waited too long to put them into soil, they were 'set' as hydro cuttings, and you plunked them into soil...The water oxygen level of 100% that it came from went directly to an almost zero oxygen level in the soil. These 2 things were the problem. VPD aside, if you would have put them into soil pretty much as soon as the roots started you would not have had that problem. Simple stated: you're waiting way, way too long to put the cuttings into soil. Besides personal experience, the Proof is: take a fully grown hydroponic plant and stick it in a big pot of soil or take fully grown soiled plant and put it in a hydroponic unit... both will die. I was impressed with the root development, but horrified that you put it in soil that late...
If he placed those cuttings in soil with low root mass and a too high VPD the results would have been the just as bad....not enough root to supply the plant at an elevated transpiration rate.
first lol
bobby blues heheh
Everest Fernandez i have a pic of a problem leaf i would love some feedback on if you have a moment sir!
Always happy to help a fellow grower.
Who the hell transplants anything like that!!!
Slow down
Your cuttings failed because they had water roots which are not suitable for transplant into a soil medium.
With a bit of love and care - far more than I gave them 😆- they can make the transition to soil but you’re right, best to propagate into the sake “stuff” as you intend to grow on into.
Dude. Stop spreading mis information.
Aero clones with roots transplant into soil and soilless mix perfectly. Water roots? Too funny, kid!
@@bohaggin5913 (Well established) hydroponic roots as seen in this video do not transfer into soil and same goes for (well established) soil started roots cannot be plopped into a hydro system. They will wither away and die as seen in this video. If he would have chopped off the roots and placed them under a humidity dome they would have re-rooted into the soil just fine without withering away.
Do you really have to talk that fast?
all of this video is nonsensical. You want your grow environment to be clean and feeling comfortable with slight humidity. You can use your own senses to feel the atmosphere. You don't need maps, measuring cups none of that consumer crapola.
By all means, wet your finger and point it upwards. If your shiny pinky can gauge temperature, humidity, and air speed and extrapolate transpiration rates accurately then this can only be a good thing; the rest of us mere mortals will stick to our thermometers, hygrometers, and VPD charts.
What else do you use
@@coolshirt In addition to a regular thermometer and hygrometer to measure air temperature and humidity, I also use an IR thermometer to measure leaf temperature. Environmental sensors (eg: SensorPush ) are invaluable for getting a 24hr picture of your growing environment. Well worth a look.
It doesn't matter what you use! You see the rock only wants to know one thing. Do you like pie.
@@coolshirt More of a strudel man.
VPD is nonsense your plants were moved from hydro to soil thus the delay in recovery, also you had light too close as you said..
0.75 speed 😁
Makes me sound medicated.
Use an inkbird and a diy mister bucket to get perfect vpd 🤌