does cannabis need more than .004 % of zinc?

my res has .004 of zinc and i've read a bunch and there allot of times where there isnt enough zinc. so what is the proper % for zinc so the plant remains healthy/ier?

bump.........

bump.....................

Cannabis doesn't really need much zinc. I'm skeptical any time someone says they have may have a zinc deficiency.

Most formulas have around 0.05 ppm of zinc. I've seen some formulas with as much as 0.4ppm of zinc.

By contrast, the suggested level of iron is between 1-5ppm.