bio bizz light mix help

hi iam using bio bizz light mix and iam into the 2nd week of some auto flowers i want to know when the nutrients tends to wear out in the soil and when i have to use my own nutrients or is it different with all strains? or what shall i look out for in my plants when they are wanting nutrients.iam going to be using greenleaf megacrop.

Light mix has enough for 3 weeks. Autos or photos is the same, then the only thing that changes is the feeding and the ml per l....

Plants will ask for N first so you need to see the leaves on the bottom for yellowing. Why N ? plants use N more and mainly during veg. Why bottom up ? N is a mobile nutrient and mobile nuts go from the bottom and older growth first.

ok thank you.very good help appreciate it very much