ph 3.8 all mix

District

District

Active Member
Hey bro's

Ive been told when growing organic (biobizz allmix) you dont have too worry about soil ph but the run off is 3.8. My plants look well but I just found that abit shocking. I also noticed what looked like a mag deficiency in the younger leaf of one plant. Im thinking perhaps this happened when in light mix because the new growth seems better. However im still more than a little confused. Some many problems look similar to others and I dont wanna make things any worse. I was also thinking heat stress as my temps are 29c but I read that white widow can thrive in these temps without Co2. Lastly I suspect transplant shock but thats just a stab in the dark. Bottom line is im a new grower and I dont know. I seem to be posting alot but early diagnosis is never a bad thing.
 

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Well 3.8 seems way to low. Never used that mix. I've been using Roots Organic Original. I ph in a range of 6.2 to 6.5.
 
Take a deep breath it's just plants bro! I'd say that your right about the ph being way too low, I have to wonder if your soil itself is naturally acidic because I can't see your nute solution being under 5
 
I haven't added any nutes apart from superthrive GFF. And I know im right about it being low. But I reserve the right to be concerned and im well aware of what they are thanks. What im not aware of is why and also if I should or should not add something, flush repot or what! Thanks for your input.
 
Really baffled because as you can see for 24 days they look OK . But with soil that has a run off of 3.8 - 4.4?? WTF is going on. Just praying doesn't go tits up thats all.
 

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This is actually the plant with the bottom leaf that has slight browning. Im putting it down to slight nute burn at this point.
 

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I wouldn't worry about it too much. the pic's of the leaves looked pretty healthy except for tip burn, which is prob from the leaf touching the soil, anr the small yellow area. the yellow spot is kinda vague imo, it's probably nothing. runoff ph is not a good way too gauge soil ph anyways, and i would guess that your test result is off a bit. If it was 4.4 your leaves would look alot worse pretty quickly.
in any case - if you do start seeing problems a little dolomite lime would raise the ph and add cal/mag same time.
 
Thanks 1itsme I was just trying to find out where I can buy rather than order dolomite lime. Do you know any good organic chelated cal mags on the market. Thanks again.
 
cal/mag isn't going to raise the ph afaik it's made out of different stuff (varies by brand but generally it's calcium nitrate, magnesium nitrate and iron). dolomite lime is different, you can find it pretty much anywhere you can buy plants.
 
what did you use to test the ph? and yes runoff ph will give you a good idea of the soil ph if you know whats going into it.
 
Sorry water going in was 6.4 when I got a reading of 3.8. I dont know if the testers faulty its less than a month old.
 
grorite said:
what did you use to test the ph? and yes runoff ph will give you a good idea of the soil ph if you know whats going into it.
Click to expand...
that's not necessarily true. when you water or feed, there's salts dissolved in solution. when the solution passes thru your soil, it comes into contact with other salts. salts which are more soluble will dissolve into it as it passes thru, and salts which are less soluble will precipitate or bind to soil particles. so testing run off ph will give you a good indication of what rinsed out of the soil, but not whats in it.
there is a method to test soil with a ph pen- you put some soil and distilled water in a clean glass for a while then strain the water and test that. or you can just use a soil test kit. hth
 
Is there any truth in the myth you dont have too worry about ph in organic grows. This is s pic of the same leaf today, the other pic was yesterday. I think it looks slighty worse. I just ordered the dolomite lime should be with me tuesday.
 

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if the soil mix is buffered, and everything else is within reason, then you shouldn't need to worry about ph with organic grows afaik.
 
oh, what were you spraying your plants with? that's prob a little splash burn on the second pic.
 
The whitish spots are the residue left from just plain tap water. Its hard where I leave. That combined with the HID I think. I try not to get water on the leaves.
 
oh yeah, you want to spray after lights out if you need to, the drops can cause burns by acting like a magnifying glass.
 
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