Adjusting pH in soil

I am flushing my plants with 6.5pH water, runoff water is around 8pH, what should I do? Keep flushing them with 6.5 over days/weeks until runoff is 6.5, or lower flushing water pH to 5.0 etc?

Julmamuna said:

I am flushing my plants with 6.5pH water, runoff water is around 8pH, what should I do? Keep flushing them with 6.5 over days/weeks until runoff is 6.5, or lower flushing water pH to 5.0 etc?

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Why are you flushing to begin with?

I have overfed them and Ph has been way too high.

Julmamuna said:

I have overfed them and Ph has been way too high.

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Well you can't keep flushing them indefinitely. Plants need to dry out. Constantly saturated soil is not good. Also, runoff is not an accurate way to test PH at the root zone which is what matters. Just feed them plain water for awhile. Dumping a bunch of 5.0 PH water through your pots could do more harm than good.

Aight, thanks for the info. My plants have just went 0-100 in 3 days, lower leaves dying and upper leaves being dry and thin as smoking papers. Trying to get something done for them before my weekend trip.

Julmamuna said:

Aight, thanks for the info. My plants have just went 0-100 in 3 days, lower leaves dying and upper leaves being dry and thin as smoking papers. Trying to get something done for them before my weekend trip.

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Picture would help to see whats the problem.. maybe there is no toxicity/defiency problem only a ph issue but who knows if we cant see it.. so far from my experience with soil dont expect big ph swing from your soil usually takes couple days.. what type of soil are you using? More info ans pictures and hopefully well be able to get you some help before your getaway

I'm using pretty hot soil, its basic flower soil in my country. I diagnosed nutrient burn from tips of leaves started yellowing and little clawing is going here and there on the leaves so maybe nitrogen toxicity? Problems started about same time as I started giving them nutrients so I thought flushing them would be good idea.

Sorry about that yellow light on the plant. Leaves are mostly very light green and dark green between veins of the leaf. Branches are weak, wont support fan leaves, one other plant has leaves directly pointing towards floor. It isn't like its sleeping, its like its dead.

Dont seem like nitrogen toxicity usually your leaf would be very dark green if too much nitrogen.. droopy leaves could be due to overwatering too.. whats your watering schedule , pot size, and quantity of water you give them? I think you just have a nutrient lockout I wouldnt water with ph5.0 but ph 6.0 still within a good range and will eventually lower your ph in your soil.. soil is usually acid so at 8.0 seems pretty high to me and they arent getting all they need..

Viceman666 said:

Dont seem like nitrogen toxicity usually your leaf would be very dark green if too much nitrogen.. droopy leaves could be due to overwatering too.. whats your watering schedule , pot size, and quantity of water you give them? I think you just have a nutrient lockout I wouldnt water with ph5.0 but ph 6.0 still within a good range and will eventually lower your ph in your soil.. soil is usually acid so at 8.0 seems pretty high to me and they arent getting all they need..

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Just wanted to add that when you transplant or for your next grow you should look at mixing that soil with something else more acid so the soil ph is more within the good ramge. Also you mentionned you started adding nutrient.. what was it? How much did you put? You should start at 25% recommended dose and adjust from there

Whats your temp and rh%?

You said that fan leave dont hold themselves do you have some air circulation around your plant?

What light are you using?

Sorry for a lot of questions but it could be so many things

I don't have schedule for watering, I stick my finger into soil and when it is dry to my first knuckle I water them, they have about 8 liters of root space in 10 liter container. I water them until I see 10-20% runoff water, which usually is about 2-3 liters.

My nutrient is Terra Vega, I put 50% of recommendation.

Temperatures are 27-29,5 Celcius during daytime and night time is 21-23, I don't have extra CO2 suppliment. No idea about rh%.

1 fan circulating air beneath scrog canopy atm.

I run 3x400W HPS.