Looking at the labels and SDS sheets from AEA nutrients, almost all have 3-5% citric acid, plus humates. I suspect this is how AEA chelates their minerals. I have will be testing the uptake of iron sulphate after I reduce and try to chelate with citric+fulvic+humates. I hope to have the pasture sprayed in the next week or so, then I will send leaves to NOVA for sap analysis. The foliar will be a biological stack, trying to copy AEA soil primer + nutrients identified in previous sap tests.