Leaves turning yellow in week 6 - is it normal?

lack of food, too small pot. would increase N part 10-20% , would feed more often. never take off damaged leaves, till they are totally yellow or wilted. small root system cant support big plant , so plant cannibalize some leaves, redirects energy. doubt you have any ph issues, calcium would show up first, not nitrogen .

LOL piss on your plants. its not bad advice per say. but your piss also has a lot of salts in it depending on your diet. UREA from piss is highest when you eat a lot of meat. You can also use any N based fertilizer. If you let it sit it will smell up the whole deck. I have tried this before. Its ok. not the best but works in a pinch. Also don't use piss if you are on any meds of any sort especially antibiotics or hormons/birth controal. don't need that stuff building up resistant bacteria or whatnot in the garden or being absorbed into the plants. It might also be wanting more food in general as it is entering bloom and stretching. Should always be watering with a bit of runoff to prevent any buildup. If you have not been getting runoff, give it normal feed with runoff. If you have been giving runoff, Give it more feed with runoff. Reference your feeding chat with BioBizz nutrients. They are quite clear do not go below 6.2 in PH their priducts need some microbal activity it seems.

Since nitrogen is a mobile nutrient and your plats start turning yellowish at the bottom leaves i would say its a nitrogen defiency. Give some nitrogen… but be careful to not overdo it. Some little trick i learned from a long year grower which actually works amazingly is to give some of urine mixed with water at a 1:10 to a 1:5 mixing ratio. Sounds crazy weird but it always did the trick on my plants. But please just do it once in a grow, since it has a LOT of nitrogen in it. Cheap and easy but only for the blunt people lol

Im new to this but i had the same yellow look.I assumed its the lack of nitrogen in the soil. Do you have sufficient nitrogen in you soil?