Help please

[Dubs8]

Hi i am first time grower doing autoflower heavyweight vast fast its 52 days old and having some trouble. Some lower leaves went yellow and some going light green I am using organic compost, and been adding Vitalink max earth 24ml per 1.5ltr 1760ppm is measurement of feed water, not sure on soil ph tester arriving tomorrow. But from pics can u guys give me Your opinion on what u think is wrong thanks

 

[Atulip]

Brown spots look like calcium deficiency. The yellowing with green veins is magnesium deficiency. Some cal mag will fix you up. Or some Epsom salts watered will fix the magnesium deficiency.(found in pharmacy) some powdered dolomite lime should help both, 1tsp/gallon or so. Not sure of other home remedies for calcium, though antacids could help theoretically(calcium carbonate)

 

[Jovie]

I suppose you should use cal-mag nutrients to help plants.

 

[Rifleman]

For your reference.