Which is the best zinc source, a sulfate, an oxysulfate? Does the quality of the zinc materials make a difference?
Does the source of zinc affect the yield? Does the application of zinc on crops with adequate zinc test levels but having elevated phosphate levels produce yield responses?
Data collected to date indicates that the application of zinc has produced significant yield increases over untreated plots. The untreated plots averaged 146.43 bushel per acre, the zinc sulfate plots averaged 156.91 bushel per acre and the zinc oxysulfate plots averaged 167.07 bushel per acre.