Understanding Ph...

Grow in Dirt, well, bad dirt/wood chip. Yeah, I know now..
Nutes: Canna Flora and Canna PK 13-14
100% Sunlight indoor in winter

I noticed my ph was a bit high 36 days in flower, so I checked it and it was 8+ (as high as the test went).

I did not understand how, but I started by working on lowering the ph with a flood and feed of pH Lower, 20% Phosphoric Acid. One drop in 3lt water.

Now that its off doing its thing, I have time to kill. What went wrong?

First thing I check is my tap water, and bingo, went off the scale. So I took some water, made my normal feed of Canna Flora and tested it and the pH was no longer high, quite the opposite using the same untreated tap water.

Now I am really confused! Every feed it gets this mix with a low pH yet the leaves curl under on the sides, and bend like a finger. This only happened on new leaves.

What's the story?

You were a little unclear on whether your plants where having problems before you tried to change the pH.

If your plant was going well before hand then you shouldn't have changed anything, or at least made a gradual change to see if it affects the plant positively. Doing a massive pH flush if your plant is health is a bad idea.

In addition did you use RO water or just tap water? If tap water did you condition (dechlorinate and/or deammoninate) the water before using it?

Remember, "If it ain't broke, don't fix it."

Ahh yes, sorry for the confusion - It was the change in the plant which prompted the investigation and corrections.

No treatment for chlorination, and your question prompted me to look for what is done to the water here.

http://www.nzic.org.nz/ChemProcesses/water/13B.pdf

They push it up to pH 8.0, so now that I know, I will only feed it with the correct water..

Thanks for pointing that out!

Hey man, I had the same thing happen with a couple of my plants and thought it was a ph issue, but now I'm pretty sure it was nute burn. Check out the pics on this thread and see if you think they're similar. I quit feeding for about a week and things seem to be getting better. https://www.rollitup.org/marijuana-plant-problems/98614-leaf-lesions-curling-pics.html

Forgot to add this. Just because the ph of the tap water is off doesn't mean the soil is off too. If you have dolomite lime or oyster shells in the soil they help stabilize ph. After looking at your pics again i see the nute burn tips of the leaves too. I would just cut down on the feeding.

Excellent point Tired!

tiredofbuyingit said:

Forgot to add this. Just because the ph of the tap water is off doesn't mean the soil is off too. If you have dolomite lime or oyster shells in the soil they help stabilize ph. After looking at your pics again i see the nute burn tips of the leaves too. I would just cut down on the feeding.

Click to expand...

I do see similarities in the photos, and will stick with just water. pH corrected water just in case. Will update soon..

Thanks guys..