Zinc Oxide in Fertilizers.
go here Zinc oxide is recognized as an essential micronutritient to plants and grains.
In crop farming – especially for corn-, zinc oxide is added to fertilizers to compensate for deficiency in zinc or for poor bio-availability resulting from the composition of the soil.
Zinc oxide can substitute Zinc Sulphate in most of fertilizer’s formula as a source for the essential element Zinc.
All grades can be used.