Soil becomes acid when waterd with 6.5

I did a runoff test in my soil growing pot. I always feed at 6.5 ph when i sawthat the runoff was 4.8 i gott scared how is it possible? I know it gets a bit more acid when the nutes touch theroot zone but not this mutch does anyone got any knowlege or experience i would love to hear it?

Should i maybe feed with 7.8 etc beacuse i know it will drop? I use a good soil basen around 6 to 6.5 ph and I always add molasses

Are you getting any foul sulphurous odours ? if so maybe stop the molasses for a bit, root rot will give you higher acidity as will any other root zone infections.
your soil is a buffer for ph as you probably already know, so the run off ph will generally be a number higher or lower, with that in mind you are half a number lower than where you should be.
Are you irrigating too often possibly ? giving little drinks to them is not good, it can cause nutrient build up, make sure you water right through and only feed every second or third watering.... i wouldn't worry too much unless your girls begin to look poorly.
personally i have found that unless you are growing in coco there's no need to correct your ph, just my humble opinion

Hmmm.

If the soil has been properly limed at being built.

You have no real need to pH it! The soil will self pH.

pH of runoff is simply the pH of the run off NOT the pH of the soil.

Different nutrients are best up-taken by the plant at differing pH values. Now with that in mind.
The soil pH will drop by around a whole point +, when you water it. As that soil dries back out, the pH of the soil will rise back to it's "resting" point pH.

If you use synthetic nutrition. It's easier for the soil to have a pH problem develop.
So then. If you worry about the pH of the things going in at a watering/feeding. Simply pH all in-going solutions to 6.5 in veg and 6.7 in bloom. AND 6.5 will be fine all the way if you prefer.

NOTE: The use of RO or waters recovered by Deheuy's and AC unit's. Should have a buffer added and then add the nutes and balance the pH if it's over 1.0 in either direction of 6.5......Especially if it's lower. I've noticed that soils can begin locking out at repeated waterings of low pH values. Generally under 5.2 and it gets worse as it gets lower.

^^^^^ Thank you, Dr Who ^^^^^

Son of a collier said:

Are you getting any foul sulphurous odours ? if so maybe stop the molasses for a bit, root rot will give you higher acidity as will any other root zone infections.
your soil is a buffer for ph as you probably already know, so the run off ph will generally be a number higher or lower, with that in mind you are half a number lower than where you should be.
Are you irrigating too often possibly ? giving little drinks to them is not good, it can cause nutrient build up, make sure you water right through and only feed every second or third watering.... i wouldn't worry too much unless your girls begin to look poorly.
personally i have found that unless you are growing in coco there's no need to correct your ph, just my humble opinion

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??? Got some synthetic feeding plant running with my organic ones, right now.
I feed everyday! Kind line! I feed/water enough to get the plant to the next day at lights on....
I got no yellowing, no burn, no problems.....no build-up and reuse my soil too.

Using run off pH as any indicator - Is inaccurate and should be avoided. If your doing so well. Why are you pHing the run off anyway?
AND, why water soil with run off? Wasteful.....in my book.

flodas said:

I use a good soil

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What is good soil? any details?

most potting soil is mostly peat. peat is acidic. runoff, therefore, is too...