Abstract
Abstract In a greenhouse experiment, Fe dust which has been collected for air pollution abatement by a steel industry was evaluated to alleviate Fe chlorosis of sorghum grown in Fe deficient calcareous soil. This by‐product dust contained 43% Fe, 5% Zn, and 2% Mn. Two sorghum cultivars, Fe‐efficient and Fe‐inefficient, were grown as test crops. The Fe by‐product was mixed with the soil at 3 rates before planting as dust and as pelleted form. Similar treatments also were amended with H2SO4. As a comparison treatment, H2SO4 alone also was applied directly to the soil. The Fe concentration increased in plant tissue reflecting both the rate of applied Fe and the acid amendment. Pelleting the Fe dust reduced its effectiveness, likely due to reduced surface area of the Fe. The less response to applied Fe by the Fe‐efficient cultivar than by the Fe‐inefficient cultivar indicates the greater capability of the Fe‐efficient cultivar to obtain sparingly soluble Fe from the soil. The Mn concentration in plants was de...
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