Coco Tree's

[Slipnot]

But lets not stop @ VPD how about some other much more important Factors such as

Heat is the catalyst for many biological processes. When soil temperatures are low (and biological processes slow), certain nutrients are made unavailable or less available to plants. This is particularly true in the case of phosphorus, which is largely responsible for promoting the development of roots and fruit in plants. So, no heat = less nutrients = poor growth.

What about the optimum soil temperatures for nitrification ??? VPD is a pretty fancy eye catching meme , it attracts growers from all experiences mostly non experienced growers.
what i am trying to say is whats your soil temperature ?? this influences everything from salt build up to moisture aeration, and nutrient availability

 

[MikeGreat]

My last grow I follow the VPD chart as close as possible. It’s very difficult for me to keep the humidity high because my AC removes the Humidity from the room keeping it on the mid 50’s all the time….
I had to add a little bit of water to the floor and buy a cheap humidifier to bring humidity up to 75% with my 82 temp….
I had fantastic results over 2.1g per light with my same setup…. So I like the Idea of a well balance ration of temperature to Humidity…..

 

[MikeGreat]

what i am trying to say is whats your soil temperature ?? this influences everything from salt build up to moisture aeration, and nutrient availability

Base on your opinion what is the best soil/medium temperature for ultimate growth and production?

 

[Ravenboy]

My last grow I follow the VPD chart as close as possible. It’s very difficult for me to keep the humidity high because my AC removes the Humidity from the room keeping it on the mid 50’s all the time….
I had to add a little bit of water to the floor and buy a cheap humidifier to bring humidity up to 75% with my 82 temp….
I had fantastic results over 2.1g per light with my same setup…. So I like the Idea of a well balance ration of temperature to Humidity…..

have you tried BIG mister? solved it for me.
i installed a 9 ceramic disk disk mister from house of garden, have it controlled with an arduino uno programmed to controls the heat and ventilation, and endeavors to keep VPD appropriate for the temperature b controlling the mister and dehumidifier . Pretty cool. if i need to change the temp for any reason, the VPD is still good, except on the edge conditions (REALLY hot, for example, the weather where i live can be gnarly hot)


or as good as i can make it without knowing the leaf temperature, though i imagine i could work out a controller that would do that good enough that the VPD would be more accurate than using canopy temp. (not sure how much it differs, it would have to be significant for me to want to work in that solution)


i used to adjust it all manually.... done with that

 

[Slipnot]

Base on your opinion what is the best soil/medium temperature for ultimate growth and production?

I always try to maintain soil temps 70 - 75 when i grew indoor and had great results
If we look at plant micro life its all soil temp related , even plant process are all temp influenced most of the issues , we see today. like plant nutrient deficiencies, disease an pest issues all start at the soil

People are going over board on VPD when you really think about it RH and temps its simple really look out side and look at how RH and temps are happening in the wild , follow those guidelines and you will do amazing .
Just like all the growers growing indoor 50 years ago its all the same shit just new tech

Remember all MJ plants were out door, at one time. With that said
follow how mother nature does it. everything in slow motion just like the seasons plants will adapt there living dont think for one minute because VPD is out of wack that the plants are not growing or blooming .

All you have to do is read plants needs dial in your grow room then knowing VPD is not needed

Like the saying goes most only here one side of a story VPD is only important if your grow room is out of wack and you cannot control RH Heat or light off temps
But the basic grow book tells you the importance of dialing in a room

 

[coldcanna]

Slipknot I don't think your actually disagreeing with DJM on very much here. He keeps the room in the 80s and is feeding 6 times a day with cooler water so I'd imagine the root zone temps are in the 70s. And as far as leaf tissue pressure, that VPD chart was created by agricultural outreach at a university not pot growers. I would assume they experimented and found that the leaf tissue numbers fall on an acceptable number if you stay on the range in the chart.

 

[Slipnot]

Slipknot I don't think your actually disagreeing with DJM on very much here. He keeps the room in the 80s and is feeding 6 times a day with cooler water so I'd imagine the root zone temps are in the 70s. And as far as leaf tissue pressure, that VPD chart was created by agricultural outreach at a university not pot growers. I would assume they experimented and found that the leaf tissue numbers fall on an acceptable number if you stay on the range in the chart.

All what i was trying to say is people worry to much they read up on VPD yet probably do not have the tools to read leaf temperature so they wing it..
With probably over half the growers on sites growing in a tent to worry about VPD is a moot point really it is they should be honing there skills in actual growing ..
lets face with the new era of technology and the new era of growers there not to concerned about having knowledge of growing a plant but spend to much time in advanced fields of agricultural science ..

Its to easy these days to post a thread whats wrong with my plants when they don't have the basic knowledge of growing to begin with
that is the truth.

Growing is a like a game as you get better you level up but not the new era they use cheats lol ..
I did not come in here to troll or what ever the fuck the call it
i am just pointing out. stop being a cheap tight wad spend the money in a real room controller and you will never have to worry about VPD

 

[coldcanna]

I would tend to agree that a complete newb might run into trouble if they crank their humidity up into the 80's, they won't understand the principles of air movement, genetics, room sanitation, proper feeding to accompany such a hot wet room, IPM, ect....

That being said, as your growing career progresses VPD is an important concept to grasp. Some people its just a hobby I concede that point, and if your running a couple lights for head smoke maybe it's not something to worry about. But a lot of people on here are trying to make a living and in some cases have investors to keep happy. If you run your room at 80 degrees and have a dehuey set at 50 your really not maxing out the potential of your room. Maybe not everyone is in the position to run 88degrees with 80% RH like DJM is talking about, but thats why the chart is handy. If your more comfortable with 65% RH then drop those temps down and your still nailing it.

 

[McKush]

I fail to see the controversy also chap. Well said!

 

[noyd666]

 

[Slipnot]

Hey Noy i am @ 93 humidity today and really worried NOT

 

[MikeGreat]

Great info.. I am going to look into...........

 

[deucetrey]

Once again, a huge thanks to DJM for posting this info. Not only did he post it, but he did it for free, which is pretty rare in this day in age. Last batch clocked in at 19.5 from 8 gavitas following his "model". I did change the pumps to different ones, the Intellipump acts weird turning on and off "sensing" water before staying on completely. a two minute feeding would result in maybe 1.25 minutes of actual watering. I used a 1/3hp pump from HomeDepot, and switched my feeding to 1 min @6 times when lights on. About 4 weeks in i did 1m 1m 1m 2m 2m 1m for feeding. I also added a Humidifier to keep the VPD correct when needed, I have tall ceilings.

Sux people have to come in here and seek attention with their feces throwing, instead of soaking in the knowledge, but thats what people are like. There are times when I root for the Illuminati, you do see what their point is. If I go I go, if I make it through, traffic will be great.

 

[coldcanna]

What strain were you running Duecetray? How many plants per light ?

 

[deucetrey]

Strain is called Sex Panther, something me and a buddy created a few years back. 50 plants/8 lights.

 

[stoned40yrs]

Don't understand why this thread isn't a sticky?

 

[coldcanna]

Agreed... I filtered it down to only DJM posts and took notes on everything.... really a treasure trove of knowledge spoon fed to us all, wonderful

 

[McKush]

why is your RH so low Noyd?

lol

muhaaa ha haaaaa

 

[highsociety420]

.

 

[siftedunity]

hmm. I hope this thread gets a bit more moderation. its sad how the idiots are scaring everyone off. it sucks for everyone who wants a decent convo and exchange knowledge.