dandyrandy
Well-Known Member
Not sure if this applies. A couple years ago I started having trouble with calmag deficiencies etc. I have been using promix since 2012. I started doing the usual. But I had some slight tip burn. Input solution pH going in at 6.5ish. I finally broke down and bought a soil probe for the meter. The containers varied but were low. Below 5.5. So I was locked out. This run I added dolomite lime until it was ~6.5. I'm in week 3 of bloom and seeing no deficiencies. I still pH my watering solution to 6.5ish. I believe it's the best run I've had. I would imagine the pH of the promix changed a few years ago. I used to use a cup of dolomite to around 4 gallon. But not having the soil pH probe I was guessing. The soil probe was worth the 85 bucks. ymmv