light mix ph

In light mix with synthetic is the correct feed ph range 6.5?. Every time using that range they get slowly spreading cal def at around week 4 to 5 flower regardless of using cal/mag. They finish at 8.5 weeks.

I was wondering if during the 6-8 week veg and 4 week flower the soil neuts are used up and then the soil basically becomes ''soiless'' meaning ph 6.5 is no longer applicable?.

The water run off is around 6.8 and that by all accounts should be ok for cal uptake in soil leading me to feel misinformed about the correct ph range for ligh mix. Or ofc something else is not right.

Any ideas?

no . I think you could add some veg nutrients with your flower nutrients . keep it all green . what are you using ?

bryan oconner said:

no . I think you could add some veg nutrients with your flower nutrients . keep it all green . what are you using ?

Click to expand...

plagron terra grow till 3rd week then plagron bloom / bb strain

week 7 now and maybe 50% of canopy has spread with brown spots (cal def as far as I can figure) or yellowing. when the problem started at around week 5 they were given half dose cal/mag in every feed, it didn't really stop the prob spreading. The last feed was just over 3/4 recommended bloom fert slowly stepped up from half feed (at week 4) but no leaves are showing neut tip burn at any point.