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run off


New Member
hi i was just wondering if someone could set
me straight with this question, when i water
my girls i like to keep the ph of my water betweeen
5.9 and 6.1 ,
i like to keep my soil ph, between 6.5 and 7.0
if i use these soil ph readings what should i be
looking for a run off reading to be


Active Member
You want around 6.0-6.5 for a soilless mix, or 6.3-6.8 for soil.

Let's say that your runoff comes out at 6.5 from 7 going in. How did that happen? The water passed through a more acidic matrix and dropped its pH. You can assume that your true soil pH is a couple tenths of a pH point lower than the runoff in this case- I'd assume about a 6.2. If it comes out HIGHER, just go in the opposite direction. If it came out 7.5, you can assume that you need to drop down from about 7.8.


New Member
OK, good stuff.

So, continuing the conversation..

If the PH water going in is 6.4 and the runoff is 5.8.. how do I correct the soil PH? By watering with a PH of say 7.0 until the runoff starts to trend up to 6.0 to 6.5? Or is that when you add some sort of PH correcting fertilizer to the soil?
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