is experiment was designed to study leaf mineral concentrations and fruit quality of ' ompson Seedless' grapevines grown in high pH soils under eld spray of vinegar, chelated iron or their mixture. We hypothesized that vinegar spray is as good as or beer than chelated iron spray in controlling iron chlorosis and improving fruit quality of grapes grown in high pH soils. e rst paper published from this research reported, that yield and iron content of this variety improved by vinegar spray. In this manuscript we report that other leaf nutrients except Mg and K were not a ected by the eld spray treatments of grapevines. Concentration of Mg and K were highest in grapevines grown in high calcareous soils (control) and lowest in grapevines sprayed with mixed vinegar and chelated iron. Vinegar spray also improved fruit quality before and aer storage with no adverse e ect on appearance, taste and avor. Berries of grapevines that were sprayed with vinegar had higher levels of total soluble solids and lower levels of titratable acidity before and aer 50 days of storage. e main bene t of eld vinegar spray was the signi cant reduction of fungal decay on grape berries aer 50 days of storage at 1 ºC. But the mixture of vinegar and chelated iron did not reduce fungal decay aer storage.
