is this nutrient deficiency?

hello!

i need some help identifying the problem with my plant.

the leafes are turning yellow (like in the pics) and very few have their tips burnt. some people told me this is overfert but i would really like to have some more opinions because the plants look healthy and there are no leaves curling down.

the yellowing started on the top of the plant and is going down.

any help will really be appreciated!

ok.. according to the "Guide for diagnosing plant problems"
i found in this section this could be an iron deficiency.. any suggestions before i do something wrong?

I have a copy of the growers bible and got this for ya.

so you're suggesting it's a nitrogen deficiency? shouldn't it start yellowing the older leaves? the yellowing is evolving top->bottom

when i had that i sprayed with epsom salts,because i thought mine was magnesium,i also flushed with a mild complete ferterlizer,but i sprayed it 3 or 4 times with the epsom salt and it was good to go.but take it for what its worth i dont want to kill your plants,but what ever it is its not that bad.

thanks it's good to hear that!

I was thinking magnesium deficiency myself, some epsom salts will help that, use sparingly.