Yellow and Green with Spots

Pulled these leaves from a bottom fan leaf of a plant that is one month into flower room conditions are perfect, 600W HPS-75%. Appreciate your thoughts.

Zinc Deficiency !

chairroller said:

Zinc Deficiency !

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Any suggestion as far as products?

Potassium deficiency from what my research is showing.

On magnesium deficient plants
older leaves yellow from the center outward
while veins remain green.
which can lead to dead patches in the affected areas
leaf tips and edges may discolor and curl upward.
Growing tips turn lime green if the deficiency
progresses to the top of the plant.

Damage is similar in appearance to zinc deficiency
but far more likely to have.
Overdoses of potassium can block magnesium uptake.
Hope that helps.