Magnesium and nitrogen deficiency?

MatC

Member
Hello, I´ve got 1 month old Diesel Mass auto plant. Everything went great since now... The lower leaves went yellow, and then even sort of coppery-brown(but just between veins), this is I guess due to a nitrogen deficiency, but i am not sure... And second, other leaves about one nod higher have light-green sponts on them, the same with their leave blades, the affected areas got crispy... I think that it is a magnesium deficiency, but I am here for your opinion. Should I spray the leaves with some Mg solution? What to do with that? Here are some pics and thanks for help:
 

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