4 weeks in flower, leaves brown spots

I would like to know what you are feeding your plant, as to my eye it could be a magnesium deficiency . Do you use supplements, like Cal Mag or kelp because a def in cal/mag usually shows up about that time. If the veins are yellowing, then it is a def probably, but if the spots are all over, check under the leaves at the brown spots for insects (use microscope) for insects/eggs. I think considering you only have 4 weeks approximately left until finish, you should be OK. Good luck.
 
Ok.

Medium : Clay Pebbles
Drip feed

Small root ball developing in res now
Res has an airstone.

PH 5.5 - 6.0

PPM 2.0

Water is 80 ppm from the tap
+ GH trio
+ CalMag+
 
Jimdamick said:
I would like to know what you are feeding your plant, as to my eye it could be a magnesium deficiency . Do you use supplements, like Cal Mag or kelp because a def in cal/mag usually shows up about that time. If the veins are yellowing, then it is a def probably, but if the spots are all over, check under the leaves at the brown spots for insects (use microscope) for insects/eggs. I think considering you only have 4 weeks approximately left until finish, you should be OK. Good luck.
Click to expand...

Thanks I'll check for insects
 
Looks kinda like calcium deficiency to me. How much calmag do you add per gallon? I wish my water was that clean, props to your water department.
 
my GH Micro is the Hard water version. I have Magne-Cal+ with contasins 3% N, so I'm worried I might give it too much. I only use a tiny bit of that. I recently doubled the about of light, now have the plant under 2 LED COB fixtures from northenlights.

Maybe with the increased light the plant needs more nutes?


edit:no sign of insects btw.
 
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