High ph, how to adjust

Hi,

I have some problems with my plants and having tested the ph with one of those moisture/ph probe things, it is reading between 6.5 and 7.5 depending on which plant I check.

I think this may be the problem but I don't know how to change the ph of the soil. I can't mix other things into the soil as they are already planted and growing. Please advise.

Also I am watering (from the start) with mineral water which has a ph of 4.

AlteaMan said:

Hi,

I have some problems with my plants and having tested the ph with one of those moisture/ph probe things, it is reading between 6.5 and 7.5 depending on which plant I check.

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Well a ph of 6.5 is fine, 7.5 is a little high but it's still fine. I wouldn't start messing with altering the ph of your water if you can avoid it - you'll cause a lot more problems for yourself.

Why are you watering with mineral water? What's the ph of your tap water and why can't you use that instead?

If you must alter the ph of your irrigation water the best way to do it is by buying some ph up and down from a hydro store. These are basically acids, one alkaline and one acidic, but as I said earlier I wouldn't do it if you can avoid it.

videoman40 said:

You need to lower your ph to about 6.2 the difference from 6.2 to 7.2 is tenfold. so thats a big difference. Distilled water can give false ph results.
Peace

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He doesn't need to lower his ph 7.5 is fine. The uptake of the macro and some micro nutrients Nitrogen, Phosphorous, Potassium, Sulphur, Calcium, Magnesium and Molybdenum are unaffected by a ph of 7.5. The only nutrients that are affected by that ph are Iron, Manganese, Boron, Copper and Zinc and then only marginally and these nutrients are rarely if ever found deficient in indoor plants.

Distilled water should have a neutral ph of 7 and in any case is not mineral water.

Well if the ph is fairly ok, I will leave it. I don't really want to be messing about with trying to change it.

BTW : I was using mineral water as it is cheap here and I thought it would be good however I am going to start using tap water.

Your in soil. Your PH is fine. For your next grow, mix in a small handful of Granulated Dolimite Lime for each two gallons of soil mix. That will keep the PH stable.

Vi

add a small amount of red clay on the top and water. red clay is fairly acidic. if this isnt good enough, which it probably wont be, then go to the store and buy some stuff called pH up. Ace - Beckett Ph Lower (7072510)
keep testing ur pH while u add