JohnDee
Well-Known Member
Other things you can do...I dealt with low humidity in the winter all the time. Wet towels, pans of water...frequent showers...anything to get moisture into the environment.
JD
Mag/calcium deficiency?
- Thread starter SamWE19
- Start date
JD
myke
Well-Known Member
I’ll bow out now. You’ve got good help here with JD and curious Good luck.
How are you adding oxygen to your reservoir, any waterfalls or air pumps?
I said don't figure them in your base nutrient. Theoretically you could add enough that will burn but I use my tap water which is 250 PPM and mostly Ca and Mg. Then I add 3-5 ml of General Hydroponics CaliMagic above whatever number I feed at.
You were lucky this strain wants more Ca and Mg.
JohnDee
Well-Known Member
I can't imagine a plant doing very well in such a low RH. Read up on Ca transport. It's almost 100% transpiration dependent. So no transpiration=no calcium.
JD
Thank you that's very sweet of you.
When I say nft/aero it’s more aero than nft. I have 160mm pipe stud vertically with the plants in the pipe. A sprinkler at the top sprinkling the water down over the roots. So just like in aero the extremely high surface area of the water droplets dripping over roots is the airation but they also then fall back into the reservoir in 18 different locations causing more aeration. My water temps are high at 25c atm but they have always been 25c I use Bennies and don’t get root rot.
Unfortunately I have no way of getting my res cooler atm I am planning a remodel but need to get this grow out of the way first
I know about VPD and yet I am in the Mojave Desert and I've been growing this way for years. 105 canopy and 10% RH and I won't use A/C far to expensive here in Los Angeles County. I could post up pic after pic of successful grows under those conditions.
Day before yesterday RH under 18%
My plants always look better in the winter because it's cooler. But they are weeds and pretty tolerant of most things.
You would be wise to drop that temp to the 60's you'll get better growth and uptake. The higher the res temp goes the less dissolved oxygen it will carry. If you begin to suffer from root rot add Ca Hypochlorite (it will kill bennies). Have you looked at wort chillder.
I'd start by adding a Ca/Mg product and go from there.
JohnDee
Well-Known Member
but your environment is different now
Color me impressed. Bet there was some serious adaptation going on with the plant. I know if I raised my temps that high and dropped rh...my plants would keel over.
I lived in Brawley CA for a summer...middle of the Imperial Valley...hit 124 in the shade one day...needed potholder to open car door...I know the desert.
JD
I’ve got a chiller but no way to get the water line into my sealed grow at the moment until I do a remodel.
In your nft how much calmag do you add to your water every time?
I’m considering upping my water to 300ppm with calmag but never sure if it will burn. Veg+bloom is high in calmag already aswell
Yeah my environment is only different due to low humidity. Corrrct me if I’m wrong but my understanding of it would mean less ppm in low humidity due to the increased transpiration? No?
Ugh, yeah we hover around 118 to 120 for a few months every summer. The amazing thing is I don't repeat a lot of strains and most of my tables are new genetics. So there's no time for adaptation LOL. However in August my table does not look like it does now. However they don't look like his either.
I used 3-5 ml/gallon Ca and Mg when in recirculating and now in drain to waste. I agree with John Dee raising your humidity will make your plants happier. Anyway I'll be curious to hear what you do and how it helps. Best of luck.
What nutrients did you use as a base if you don’t mind me asking? Just wondering if my base technically already has 3-5ml calmag in it
General Hydroponics Flora Series Trio. It was about the only thing there was in 1996. I've been happy with it.
There ya go, leave out the Ca and Mg additive and you'll know in a week what the problem was. I wish you the best.
I hope it is a simple humidity fix but I’m trying to understand how the humidity could cause this. Like you said you grow in low humidity so I don’t see how this could be the cause. I’m at a bit of a loss tbh although jacking up my humidity has just knocked my temp down quite a bit. Hopefully that’s gonna take some strain off my ac units too
New growth vs. old growth is a sign, ie: where the problem first started can help determine what element could be the issue. Sorry not too specific.
Fuck no, you can make one easy for less, less than half that. Search "DIY humidifier" here, or DIY ultrasonic humidifier on youtube. Or go to houseofhydro.com.
JD mentioned above that Ca is largely dependent on transpiration. Ca is an immobile element.
If your room is *sealed, I'd think a humidifier would work pretty well. But you said it's a large room, I duno how large. I'm just gonna add that, if you do find interest in the diy ultrasonic humidifier, maybe call houseofhydro and just ask them some questions re: size of room, how many disc unit you'd need for that space etc.
Also, http://www.angelfire.com/cantina/fourtwenty/articles/profiles.htm
Enter everything you're using into this calculator or similar one online and get an actual idea of what level of each element you're currently providing, instead of just going by electroconductivity of the whole solution. You can also search here for @Renfro who posted an excel spreadsheet calculator that does the same thing.
Peace.