Iron by‐product as influenced by selective dissolution techniques, acidification, and soil reaction

Use of basic salts of iron and zinc as plant amend‐ments in soils

“…However, the synthetic chelating agents are frequently too expensive to be used in general field agrlcuhure and are difficuh to supply at the correct concentration. This has led to the search for alternative sources of these micronutrients (Mortvedt, 1986;Wempati and Loeppert, 1986;Parpian and Anderson, 1988). Chelating agents can be toxic to plants when used in excess and have been found to inhibit the uptake of other cations by plant roots (Wallace, 1983;Wallace and Wallace, 1983b).…”