I would target ph more to 6.5 - this allows for any
drift - if it does then you are at least within range and
not starting at the minimum edge of ph range.
It may seem like - what does it matter 6.1 or 6.5 but you are trying to have all elements available. 6.1 you start to possibly lose calcium uptake.
This is why if you control what’s going in ( PH and PPM ) then there is zero reason to check runoff. Besides when you check runoff - are you doing a 10% or 20% runoff , etc. ? Because any number pulled will be different based on that alone. Runoff is there to check high salt buildup ( overfeed ) and some obvious plant PH issues. Other than that it really isn’t necessary in a good living soil.
What other plant
needs runoff checked ?
GL
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