#deficiency

Hello everybody. I currently have 19 different plants. 11 are at their Week 6 (40-days old), but I started using Nutrients since Week 4. 8 are at their Week 7, (49-days old), also started with Nutrients here since Week 4. What I've done / what I've used: -On Week 4, I used Great White Powder...

I'm having problems with my lower leaves yellowing at the tips then some brown spots. Does this look like a type of deficiency or a pH problem in my soil? I have no idea I'm a noob so I'm learning as I go. I'm hoping someone with more experience could give some input about this. The plant is...

Hey guys, So quite new to growing here (My first real grow running at the moment) I Have 4 Autoflower's In their 5th week of flowering now, 3 gallon's in coco coir & running cmh. was feeding daily with a ph @ 5.8, now I'm feeding @ 6.1. (800 PPM) Now It appears 1 out of 4 of my plants has...