plant development

I have been getting this problem recently and i dont know what it is, first i thought it was a calmag deficiency so i bought calmag+ been going good then it happened again leaves turning a rust brown and to this plant. Its a gelato og clone . Any help would be truly appreciated

Hello Everyone. Call me Gizzo.I have questions concerning outdoor plant development in tube Ohio - Michigan area. Looking for information on size, smell from distances, about the months you can smell the most and at what distances. I appreciate you guys help. I know some of you guys with...