Iron supply for Hydroponic Leafy Greens

[sirhans]

Hi,
Im looking to grow leafy greens like butterhead and romaine lettuce, but I havent figured out the right Fe ratio yet.
The fertilizer i currently favor has

Iron (Fe)* 55 ppm Manganese (Mn)* 11 ppm

how much would you recommend for lettuce growing?
greetings,
hans

[JONA]

The balance of these two is important as you indicate sirhans. Those levels look ok, keeping the magnanese down to a level that will not affect iron take up.
Don’t forget ph levels though. The nearer to 7 the poorer the uptake by the Roots of iron.
In trials I’ve looked at iron 50 ppm with added manganese at around 6 the final dry weight was improved.