Hey
@newbie1, there is a nice article on
Pro-Mix's website on methods to increase soil pH.
So if you do find yourself wanting to raise the pH your next run, this would be useful for you for when you are mixing up soil for your next batch.
Most agricultural application rates are 1 ton/acre, which translates to about 20 grams/square foot.
Do no top dress any liming materials as they do not penetrate more than an inch or two before reacting with the soil, you must mix thoroughly while the soil is dry.
In agricultural applications they till the soil 6-8 inches deep while their machines spread the lime to ensure they change the soil pH on the surface, which is mostly where soil acidification occurs.
The lower you go, the less acidic a soil is.
If you would like a little more depth about soil pH, and methods used, and also a breakdown on the different types of lime used, here is a link to
application rates of lime (Oregon soils).
I felt obligated to post this, as I recently purchases a soil pH pen, and realized my soils pH was identical to yours.
I have noticed new growth is not as green as I would like it to be, or have seen on other grows, specifically outdoor crops.
And I would like my pH of the soil to be 6.5 at all times in between watering and feedings.
It would make total sense, and it would also save some money on nutrients if the pH is always in the specific zone where nutrients are most available to my plants.
This may interest me a little more than you as I reuse my soil and grow in beds.