Any ideas what this is?

[Waira]

... Hmmm, looks like some P defc. too, along with N defc. in the larger necrotic patches (lowers going pale),... bud development seems kinda poor,.. are you on full strength bloom nutes? What's the light source, hours,etc.,.. ..Ca-Mg is good to have extra of, so that's fine; As for pH, each pot is a separate little ecosystem of sorts, and so can drift differently from each other,..point being, we need to determine if your pH is off enough to be locking out certain nutes, or if these are just plain lack-of defc.'s,...I think the latter, but it's wise to always check when something like this happens,..

 

[doobydoobydo]

Cheers, i gave it some cal mag and seems to be stable, no more yellow leaves. I have started bio bloom along with the biogrow and i gave them all 1mil per litre of cal mag. Should i include that for the rest of the time?
A

 

[Waira]

doob, please don't open multiple threads on the same plant issue, it makes keeping track a pain, and it's unnecessary,...

 

[doobydoobydo]

ok sorry
a