Acid and acid‐iron fertilizers for iron‐deficiency control in plants

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Abstract
Acid fertilizers can provide several advantages when applied to alkaline calcareous soils. Among these is the enhancement of Fe availability in localized zones of the soil. New fertilizer matetials are available or can be available for banding in seed rows or for placement in transplant holes for trees and vines to prevent Fe deficiency. The inclusion of elemental S in the fertilizer formula can provide a reserve of acidity when conditions favor oxidation of S. The acid environment created by the presence of so‐called “dry”; acids in the fertilizer can help favor the oxidation. Several dozen formulas for acid fertilizers have been developed, and some of these materials have undergone preliminary tests for prevention of Fe deficiency. The results indicate the practicability of minimizing Fe deficiency in the early stages of growth of field crops.