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wtfn's 4000w legal medical soil food web organic grow show
- Thread starter whythefnot
- Start date
It's not likely a problem with your soil. Unless you don't have adequate circulation in your room, and the temp of the soil itself is getting too high. Where's your humidity at day and night? Should be 60-70% during the light cycle, and around 50% at night, when using those temps and co2. My guess is VPD (vapor pressure deficit) is your problem. Do a little research on the subject, it's an important concept for any grower to understand.
whythefnot
Member
whythefnot
Member
Holy crudballs -- after looking at some photos of plants with VPD issues, I really think you've hit the nail on the head. I'd rep you again but I'll have to dig around for a few more of your posts first.
I'm not sure what I'm doing wrong yet, because my numbers all seem to line up in the 'safe' ranges, but I'll do some more obsessive reading and get back to you.
Think it could be related to the fact that I don't really have different settings for day/night? I don't have a controller for it yet, and probably can't afford one until after this harvest, unless it is really going to noticeably improve this grow.
Anyway, back to reading...
I'm not sure what I'm doing wrong yet, because my numbers all seem to line up in the 'safe' ranges, but I'll do some more obsessive reading and get back to you.
Think it could be related to the fact that I don't really have different settings for day/night? I don't have a controller for it yet, and probably can't afford one until after this harvest, unless it is really going to noticeably improve this grow.
Anyway, back to reading...
whythefnot
Member
Hmmph, could it be true that my plants will not be happy at 81*F unless the RH is 70+%? How do people complete a grow with CO2 at higher temps without mold or mildew?
When I get home from work tonight I'll be sure to get a good canopy temp measurement, which is something I haven't done yet. Instead, I've been relying on 3 thermometers placed around the room (a/c unit, dehumi, and a therm/hygrometer placed on the far wall). Maybe that will provide me some more insight.
Either way it goes, I think I'm going to be keeping the temps under 80 for this run, just to be on the safe side.
When I get home from work tonight I'll be sure to get a good canopy temp measurement, which is something I haven't done yet. Instead, I've been relying on 3 thermometers placed around the room (a/c unit, dehumi, and a therm/hygrometer placed on the far wall). Maybe that will provide me some more insight.
Either way it goes, I think I'm going to be keeping the temps under 80 for this run, just to be on the safe side.
Plants will do fine at 81 and 60% humidity. This is at the canopy, not the room (very important difference). People that use high humidity successfully have LOTS of air circulation around the room, and use good hygiene to maintain a mold free area. Control over the inevitable night time humidity spikes is also paramount. Basically you create conditions where mold can't reproduce. Think about the rain forest, it's nearly 100% humidity all the time, and no mold issues. Some of the largest fastest growing plants (herb included) exist in the rain forest, it's not a coincidence
.whythefnot
Member
Plants will do fine at 81 and 60% humidity. This is at the canopy, not the room (very important difference). People that use high humidity successfully have LOTS of air circulation around the room, and use good hygiene to maintain a mold free area. Control over the inevitable night time humidity spikes is also paramount. Basically you create conditions where mold can't reproduce. Think about the rain forest, it's nearly 100% humidity all the time, and no mold issues. Some of the largest fastest growing plants (herb included) exist in the rain forest, it's not a coincidence
I can't begin to tell you how much time and headache you just saved me. Any more often-overlooked concepts I need to check out while you're at it?
Thanks again.
whythefnot
Member
By the way, my canopy temp was 5 degrees higher than the temp on the wall, and 4 degrees higher than what my a/c said. I don't know why I've never had issues with this in the past because I've always measured temp this way -- and these hoods run cooler than anything else I've ever used. That explains why they started having trouble when I set my a/c higher than 82. I feel like a dolt.
I can't begin to tell you how much time and headache you just saved me. Any more often-overlooked concepts I need to check out while you're at it?
Thanks again.
There are tons of overlooked concepts, just depends on the person as to which are over looked
. Best advice I can give you is to read, read, and read some more. Start by clicking the "ratings" button at the top of right of each subforum. This will arrange all the threads in that sub forum by star rating. Read all the 5 star threads, then the 4 star and so on for each sub forum. This will take you probably a year or more, but the knowledge gained will be priceless We all miss little things here and there, and if ya don't know any better....... Well ya can't be expected to fix a problem if ya don't know what it is now can ya? Live, learn, then overcome
.BTW what's a dolt? Never heard that one before.
Live, learn, then overtake
.
I've had the same temp issues. High humidity and lots of air circulation ftw... Idk about the rainforest analogy but I'm not here to nit-pick today.
I've had the same temp issues. High humidity and lots of air circulation ftw... Idk about the rainforest analogy but I'm not here to nit-pick today.
Didn't see any of those 20+ft monsters out in the jungle while you were down in South America
? Missed one of the finer points of visiting that part of the world bobble whythefnot
Member
There are tons of overlooked concepts, just depends on the person as to which are over looked
We all miss little things here and there, and if ya don't know any better....... Well ya can't be expected to fix a problem if ya don't know what it is now can ya? Live, learn, then overcome
BTW what's a dolt? Never heard that one before.
dolt
dōlt
noun
1.
a stupid person.
Funny thing is, I was pretty sure I had done that already sometime over the last 10 years...Always something...
Have you positively identified the bugs on your sticky strips? Looks like there are many many many of them. If its fungus gnats i suggest getting some BTI going quick or your flowers will be covered. If its something worse you better really get going on the problem.
whythefnot
Member
Now, I know that the plants will continue to bud out fine, but will the leaf damage/curl that's been done ever be repaired, assuming I am keeping my VPD at .9?
Las Cataratas de Iguazu/Iguazu Falls- been here 3x on 2 trips.
Maccu Picchu- been here once. I'd love to go back.
The jungle is at the bottom of this road.
Under the trees there's hardly any air movement. Its humid, and there's lots of mold on decaying plant matter. Up in the canopy is where most of the life is, along with more air circulation... But the sun and the starches it helps produce are what stop the mold from growing. BRIX.
My garden outside is only getting 2hs of direct sunlight a day b/c of the Earth moving in relation to the Sun and the shadows being cast by all the trees... My tomato plants are molding and dying.
I mean I guess the rainforest analogy works... but imo you made it sound like there isn't mold in the jungle. Its everywhere. Its what kills the weak plants and feeds the stronger living stuff.
Maccu Picchu- been here once. I'd love to go back.
The jungle is at the bottom of this road.
Under the trees there's hardly any air movement. Its humid, and there's lots of mold on decaying plant matter. Up in the canopy is where most of the life is, along with more air circulation... But the sun and the starches it helps produce are what stop the mold from growing. BRIX.
My garden outside is only getting 2hs of direct sunlight a day b/c of the Earth moving in relation to the Sun and the shadows being cast by all the trees... My tomato plants are molding and dying.
I mean I guess the rainforest analogy works... but imo you made it sound like there isn't mold in the jungle. Its everywhere. Its what kills the weak plants and feeds the stronger living stuff.
whythefnot
Member
It's fungus gnats. I've been "keeping an eye on them" so far, but you're absolutely right. Observe-and-report is over. It's time to deal with them.
whythefnot
Member
I've decided that I'm going to put my dehumi on a timer, and only let it run during lights off. I'll set it to 50%. I may have to get a humidifier for lights on. I was assuming that I didn't, since my room is sealed and I'm running co2, but maybe I had some misconceptions there. We'll see what it looks like tonight.
whythefnot
Member
Aw crap. I just found the manual for my dehumidifier online. Turns out it has a built-in cycle timer, which is good. But it looks like the mode I had it set to, "Auto", automatically sets RH to 50%. Bad, bad, bad, bad, bad. I wonder why it even displays the set RH on the screen, that's very misleading. At least I know now.
whythefnot
Member
I picked up some mosquito dunks and a green CFL at the lowes. Tonight I'll spend some more time monitoring my environmental factors and deciding if I need a fogger or if I need to steal the girlfriend's bedroom humidifier
whythefnot
Member
Freaking hell man, there is a LOT of misinformation on the topic of temperature and humidity out there. No wonder I had it wrong. 9 out of 10 closed threads settle on some variation of "50-60% rh for veg, 40 - 50% for flowering." Now I realize that that's just some bull.
A lot of the tops closest to the lights have been hit pretty hard. Some of the plants just look scraggly now too. I really hope their appearance can bounce back now that their environment is a little more hospitable. I'm sure my yield will be affected, but not nearly enough to scrap the grow. Bud development still looks on pace throughout the room.
I think I need a humidifier in the room. I'm going to try running my tea brewer with clean water only to raise RH in lieu of a humidifier. If it works, I may stick with it throughout the grow. I'm really hoping to avoid buying a controller. Any thoughts?
A lot of the tops closest to the lights have been hit pretty hard. Some of the plants just look scraggly now too. I really hope their appearance can bounce back now that their environment is a little more hospitable. I'm sure my yield will be affected, but not nearly enough to scrap the grow. Bud development still looks on pace throughout the room.
I think I need a humidifier in the room. I'm going to try running my tea brewer with clean water only to raise RH in lieu of a humidifier. If it works, I may stick with it throughout the grow. I'm really hoping to avoid buying a controller. Any thoughts?
