Soft hanging yellow leaves, some with brown spots in the middle. Deficiency, Nutrient Burn or what could cause this ?

Second picture reminds potash a lot, i checked first and went to look at diary. Organoman most prob is more right on this than me.

calcium deficiency, what caused it should worry you most. last week i saw only small clawing of leaves, would say nitrogen toxicity or heat stress and underwatering. girl needs good dose of calmag, a bit of grow nutes and right watering amounts and sheduele. some ph pens can lie, but here i think its more underwater and lack, than ph swing. thats how it looks to me.