Deficiency or over feeding?

710slickxx

710slickxx

Well-Known Member
Hey guys, got a couple plants that are acting wonky, was wondering if the problem could be id... heres #1
Coco/perlite 50/50
Feed @ 900 ppm
Cal mag with every feeding
Leaves curling up and leave tips turning yellow
 

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potassium deficiency, Flush and chop, they look done.

calcium shouldnt be used the final 4 weeks of flower, it just wants mag/potassium more then anything. At this stage, when calcium is in abundance and not used, it blocks potassium uptake.
 
InTheValley said:
potassium deficiency, Flush and chop, they look done.

calcium shouldnt be used the final 4 weeks of flower, it just wants mag/potassium more then anything. At this stage, when calcium is in abundance and not used, it blocks potassium uptake.
Click to expand...

Not just yet, trics are still clear
 
Not a big deal imo, looks fairly healthy to me.

Have you checked the ec of your waste recently? If it gets worse might be worth it.

Doubt it's potassium deficient. Would be plenty in your fertilizer, and coir fibre itself. Potassium can lock itself out though. So it is possible it's in excess, but i don't think it's worth pin pointing any specific nutrient problem at this stage. Just focus on ec.
FWIW, i've had top leaves looking like this under hps. Thought it was heat stress / low humidity. Turned out it was the ec in my coir, and with the combination of heat and low humidity, it dried my tops out.
 
it could also be the strain finishing up, mine do this too, they taco close to the bud, and that tells me i have 2 weeks left.
 
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