Why VPD Could Be Killing Your Yields!
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- เผยแพร่เมื่อ 17 ม.ค. 2025
- 🎬 Cannabis Experts 🎬
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So it's not Venereal Plant Disease then. Good to know
Fascinating. I love gettin' in the weeds
why since I started to keep my VPD around 1.31 got more fat buds?
so when is anyone gunna' talk about VPD in relation to the night (lights off) and the day (lights on). Does it matter ? And how much ? and what ranges are "beneficial" in each (day/night) ? I'm not asking that specifically , just stating a thought.
Now that is a video that I know will get tons of views and questions answered. Looks like I have my new "research rabbit hole" for the next few days now. I already have my thoughts and answers from the research I've read so far but ... like Johnny #5 always said ....I need "input, input" "more input". lol
@TiberiusGracchusII
Yes and no. Remember, the core of VPD is to create an optimal environment for the plant to uptake nutrients. This primarily occurs with lights on. When lights are off, the plants are at rest, which doesn't mean they completely stop uptaking nutrients but it's a steep decline as compared to lights on. So is VPD important with lights off? Yes, though not as much.
@@youngnixx88788 my exact thought and meaning basically. We see many many videos and content on VPD but almost no mentioning whether or not it matters in relation to day/night VPD levels since stomata are mostly closed or are closed during lights off periods to conserve ...but I got ya points of the comment. I knew that much at least but my point was we rarely , if ever, see/hear any mention of this (day/night VPD) in the many videos found here. If day/night temps and humidity is talked about a lot and very important than why isn't the relative VPD mentioned as well
Great 👍 question
just replicate outdoors
I try to keep it close to 1.00 depends the climate your replicating, that, should be the goal your looking for. My goal is Keeping a Puerto Rico climate, in my tent. A Caribbean tropical climate.
Worst thing for me was humidity lead to an infestation of tiny flys. They didn’t do any harm but there was thousands of them for about 3 - 4 weeks.
Whilst it was enjoyable growing a few cycles, it’s too much hassle for the price and quality I get from my prescription.
It would be ideal if I could grow my own medicine like Germany.
fungus gnats - they're a pretty common pest in almost any garden. Sticky paper and check your soil conditions to make sure your soil is drying adequately between watering sessions (if you have algae or powdery mildew on the surface - you're overwatering)
Those little flies were probably fungus nats. I had a bad infestation last year. I put a layer of dry peat moss on top of the soil. It keeps them from laying more eggs in your moist soil. Their life cycle is pretty short, so if you can stop them from making babies, it's over pretty quick. I keep a layer of dry peat moss on top now to prevent them.
Guy from Germany Here.
WE can grow Weed for recreational reasons. But for Medicine we still have to visit the Doctor. And ITS bullshitty that WE are Not allowed to own more than 1.76oz
@Lukas-sm3du I live in Minnesota. We are allowed to carry 2oz (56 grams). And we are allowed 2lbs (907 grams) dry flower at home. We can have 8 plants, only 4 flowering. But it's only a civil penalty until 16 plants, which is a crime.
@@NickDevXT hey Nick. Thanks for info! I did use sticky tape but my goodness there was loads of them lol
Sorry for going off-topic but I have a question....Can two autoflower plants make seeds? I haven't seen this addressed anywhere I have looked and don't know who else to ask. Thank you.
Pretty sure you can spray autos with sts or colloidal silver (50ppm+) to create male flowers. You can then either open pollinate with both in one tent or hit the female with the reversed pollen by staggering germination and spraying the first plant, then saving pollen for the non reversed female.
I really dnt worry about it as long it's around 50 60 percent range fine with
It's all easy if you assume the leaf temperature is the same as ambient. But this is unlikely. If your leaf temperature is lower than ambient temperature, this changes the vpd.
Lower leaf temp & assuming it's ambient will mean it's actually running too humid. Dry the other way around.
From reading about it seems leaf temperature will generally be lower than ambient in most cases. Although this part I've not found anything concrete. Also the leaf temperature will change throughout the day.
correct you use the leaf temperature and then change the ambiant rH to the most efficient for that temperature. Healthy leaf at maximum evapotranspiration is generally 2 to 4 deg c cooler due to the cooling effect of evaporation off the bottom of the leaf serface. I use a ir heat sensor (point an ir thermometer at it) these systems that manage rooms do not do that although an assumption could be made about leaf temperature
@paulchrystie5460 From what I have noticed a lot mention it when talking about vpd, but that's as far as it goes. Most seem to just imagine their leaf is at ambient or set their environmental controls from the sock settings which are for ambient temperature.
I sort of assumed leaf temperature would be a little below generally. So thanks for the input as I was guessing. Set my 69pro controller a few degrees C below. Asked in a few controller reviews what others were doing. Zero comments.
Missing a large part of this conversation. CO2.
Without proper co2 levels, raising lowering heat/humidity don’t mean a damn thing 😊
100% accurate
Your missing the point of vpd. It is based on the leaf temperature not the room temperature. A healthy leaf transpiring naturally can be 2 to 4 deg c lower than ambient. A light stressed leaf can be 4 to 5 deg c over ambient. NIce to see you sharing the knowledge about vpd but without leaf temperature the calculations are mute. When VDP is to high, although it puts the leaf and plant under stress, The plants response is to close stomata to reduce water loss. Closed stomata = no uptake of nutrients and no conversion of glucose to energy and no fixing of carbon in building of cell walls. A vdp stressed plant stops growing and protects itself from water loss. This then stops transpiration on the leaf and the leaf temperature rises. A viscious cycle
Whilst maintaing a VPD throughout a cycle is imperative for efficient growth. VDP is of significant benefit when you cannot reduce the temperatures of an indoor grow below 27 dg c By increasing humidity in line with vpd temperarture graphs allow growth to continue when hotter temperatures are unavoidable
The vpd charts take this into consideration. pulse VPD chart basically is at -1c which is about right depending on your lights. You can tweak the leaf temp on the chart if in yours is lower than -1c. You’re right in what you say but a leaf being 5 degrees different to ambient means you have other issues, I’d rectify them before even thinking of sorting VPD.
@@jordanscarborough-ht7zx I agree except leaf temperatures 5 deg c can be a consequemce of of having the vdp wrong, Also having a vdp chart that is modified by 1 deg c is like running mcas in a 737 without telling the pilot. I know itis a little more complicated to understand leaf temperature rather than ambient . But are we learning science here or using full self driving. Knowing the actual science and and the actual physical consequences of it allows complete understanding of the transpiration process. Dumbing down the chart by reducing 1 deg c doesn't gives the correct understanding of the biology happening in a scientific way.
@ yeah I basically just use a temp gun and found that mine sits comfortably at -1c which the chart already comes pre -1c anyway. So I guessed that it was kinda the norm seeing as it was spot on for me
It is a concept that the industry has come up with to sell more diverse and fabricated products. I get unbelievable yields from my autoflower plants under probably the worst conditions in the world, even though the temperature of my tent is 18 degrees Celsius due to my location and sometimes I don't take care of it for weeks. I don't even have a humidifier. Or rather, I have one, but it calcified inside the tent and I stopped using it. Sorry, it's all a story, man. If you are not going to invest millions of dollars in this business and trade it, you don't need to deal with such things and I can prove this to anyone who contacts me directly.
Great post! You're correct! VPD is a marketing goldmine. And I have witnessed Autos grown under a $35 Amazon Blurple put out over 7 ozs, grown in poor conditions. I would defiantly suggest a dehumidifier tho.
Besides necessary and unnecessary equipment it's also a question how many energy you are willing to invest by running an dehumidifier or heating the room if you want keep the vpd correct. Electric power and fuel is not very cheap here in Germany.
@matneu27 if you have to choose between the two defiantly prioritize a dehumidifier, they help heat up a room too. In most cases you only need a dehumidifier starting at the end of week 4 of flower till harvest so defiantly expect to run one for 1-2 months.
@@Gh4cv definitely and defiantly are vastly different words btw
@@popesymbolism9365 What the hell?!? 🤣 Well yeah, defiantly too! I've always caught a lot of slack for saying a dehumidifier is the most important piece of equipment you can own.
Vpd is not your issue ! Another useless video from these guys 🤦♂️