Rust color on some top leaves

Mad1operator

Active Member
watered and fed friday night, monday night i noticed a rusty look to top leaves so i raised my lighting a little. Next day was worsening. Turns out soil ph was high alkaline. I ph'd some fresh water and flushed. Week 6 of flower. Question is am Ibon the right track16026780249176560312461138709178.jpg
 

RonnieB2

Well-Known Member
I had the same issue. I raised my light and did an amio silicate blast with recharge and it cleared up
 

RonnieB2

Well-Known Member
What you got cooking? GSC here
Gorilla glue x2, RocBudinc Purple Roc, and Mephisto northern cheese x sour bubbly. They are week 6 from seed. I highly highly recommend RocBudinc. This guy knows what hes doing
 

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Renfro

Well-Known Member
Ph was at 8, flushed with 4.9 (was shooting for 5) and this morning it is 7
How did you determine it was at 8 though? Please don't say you used one of those cheap analog pH meters with the long thin metal probe, sometimes combined with a second probe for moisture readings? If thats what it was then you can't trust those, I have seen them read exact opposite, if the pH was 5 then it would read 9.
 

Mad1operator

Active Member
How did you determine it was at 8 though? Please don't say you used one of those cheap analog pH meters with the long thin metal probe, sometimes combined with a second probe for moisture readings? If thats what it was then you can't trust those, I have seen them read exact opposite, if the pH was 5 then it would read 9.
Oops.....
 

RonnieB2

Well-Known Member
Yeppers. Auto flowers. I also grow highend salt water corals and ph is everything. I have a 1000 dollar ph, gravity rig and the ph up and down kit is just as accurate
 

Mad1operator

Active Member
How did you determine it was at 8 though? Please don't say you used one of those cheap analog pH meters with the long thin metal probe, sometimes combined with a second probe for moisture readings? If thats what it was then you can't trust those, I have seen them read exact opposite, if the pH was 5 then it would read 9.
What if then is the more accurate way to make that determination
 
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