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Strictly_Kush
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What style of hydro are you using? Different mediums and nutrient schedules can effect the pH @ the root level. If you are using a method that allows you to capture some runoff from a plant does the pH level vary from the intial level to the reading of the run off? If it varies by more than .2 then you may want to consider flushing with water pH'd to 5.5.Ok fair enough :) I am growing Blueberry kush cuts and they seem to be happy at 5.5-5.7 range... This is my second hydro grow, my first run with different strains 5.8 was right on.. Its crazy how much difference a few points can make...
What style of hydro are you using? Different mediums and nutrient schedules can effect the pH @ the root level. If you are using a method that allows you to capture some runoff from a plant does the pH level vary from the intial level to the reading of the run off? If it varies by more than .2 then you may want to consider flushing with water pH'd to 5.5.
If your plants keep requiring you to lower the pH of the nute solution to keep them looking happy then most likey your medium isn't properly buffering the nutes and you will run into salt buildup issues.
All that said 5.5 - 5.7 is certainly within the "normal" range for hydro.
Im using ebb & grow 12 site system with hydroton, My runoff goes to a reservoir and Im using Lucas Formula for nutes.. With my last grow DWC 5.8 - 6.2 was fine, with this grow Im seeing that anything above 5.8 and my plants dont like it..
I changed my reservoir today and adjusted nutes down to 5.5 and over the next few days Ill let it drift to 5.8 then adjust it back down again..
to prove what I'm saying take a look at a nutrient uptake at different ph leves as indicated in this chart.
....
you can see that each nutrient acts different at different ph levels so if you drift from the bottom to the top everything gets a chance to shine plus you are not fucking with your res as often. this is my theory and I'm no guru but again it's just logical and never been challenged when i said it.
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