Nope… 5.8-6.2 in
promix is too low ….hence the reason your seeing P deficiencies.
Bring that PH up and they'll bounce back quick.
Still not sure why you'd want to feed 5.8 one day …then 6.2 the next or anywhere in-between.
Long ago, I learned about
natural PH swings in the root zone that occurs each time the medium begins to dry out.
If there's no salt build up in the root zone, the PH should naturally rise upward allowing the plant to uptake all that you throw at it!
If there is salt build up, the PH will suddenly drop causing deficiencies and lockouts.
To put it into perspective, I flower my plants out in 1.5 gallon pots and each one gets watered with 1 gallon of mild nutes every single day!
Plenty of ample runoff!
My nute regimen Never changes all throughout the plant's cycle…. Only my PH changes!!!!!!
In Veg, plants want a slightly lower PH, so that N becomes more readily available.
In late stage bloom, the PH gets raised a little (5.8) to allow P to become more available and not so much N.
So for instance, since I grow in RW, in veg, I PH to 5.6 everyday.
So, by the time they need to be watered the next day, the root zone is somewhere around 6.0
