PH Fluctuations

[Sessan]

Ok, i have a question since my plants are showing signs from ph fluctuations. I put all my nutes in the water and mix it, i then let it sit for a while before i add the ph-down. After ph-down is added I'm within the range of 6.4-6.7 but since my plants are showing that something is wrong i checked the ph again in the same bottle that was 6.5 a couple of days ago. It was now under 6.0. The bottle has been standing for 2-3 days since my first measure, so my question is- does the ph in the water drop more after each day? Hope it made sense

[UndergroundFarmer]

Are they in hydro or coco or soil? If they aren't in hydro, you should probably be shooting for somewhere around 6.0 when you are watering/feeding. I have had premixed/pHed solution sit a few days and need its pH adjusted again, so not much of a surprise there. If you're growing in hydro, you should be aiming for 5.5-6.0 in their nutrient solution. Try the tutorials for help diagnosing your plant issues. Most are pH-related but sometimes there's something else like too small of a pot (rootbound) or grow room temperatures and relative humidity.

[Sessan]

They are in soil, temp pots and humidity is as it should. I first thought it was nitrogen deficiency, but since i have all the nutes required i checked the ph again and noticed that it had dropped under 6. So it is to low. But then i know that it can change after a couple of days, thank you for your answer

[bboyfromwayback]

You should measure your ph and adjust after mixing it instead of letting everything settle then taking your ph readings. I only mix enough water for that watering instead of making a big batch and letting it sit. May do good to flush your plants at a higher ph 6.8-7 with light chemicals

[changeofpace2014]

I use acid to bring the ph down.. It seems to be stable for a few days and thats all is needed. I did notice when I started using half distilled water : tap water it was more stable.