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An Fe-dust waste which accumulates as a by-product from the steel industry poses a disposal problem. Since the waste material contains approximately 43% Fe, 5% Zn, and 2% Mn, it shows potential for recycling as an agricultural plant nutrient. The Fe waste was evaluated in laboratory experiments to explore solubility, availability and soil reaction relationships.

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Iron and Zn source and rate experiments were carried out in the field on soils where rice (Oryza sativa L.) grain yields had been reduced drastically in previous years by seedling chlorosis. Soils where seedling chlorosis occurred were higher in pH, HCO3 and Ca content and lower in Fe and Zn than adjacent soils where normal growth occurred. Iron sulfate, alone or in combination with ZnSO4, was the most effective in correcting seedling chlorosis. A maximum yield increase of over 2,100 kg/ha was obtained with the application of 100 kg/ha of Fe (from Fe2(SO4)3). Organic sources of Fe and Zn were less effective in correcting needling chlorosis and producing yield increases.

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