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Effect of Ferrous Sulfate and Sulfuric Acid on Grain Sorghum Yields¹

Sulfuric acid and ferrous sulfate treatnients of calcareous soil increased yields of hybrid grain sorghum grown in the greenhouse. Effects of 250 ppm or more Fe with 250 ppm or more H₂SO₄ were still significant on the third crop after soil treatments were made. This study shows that residual effects are possible from heavy applications of FeSO₄and H₂SO₄.

In a field experiment, 560 kg/ha iron as FeSO₄ or 560 kg/ha of H₂SO₄ produced about the same yield response on calcareous Arch Fine sandy loam.

Key Words: Iron • H₂SO₄

² Research Soil Scientist, USDAS outhwestern Great Plains Research Center, Bushland, Texas 79012.

Received for publication August 4, 1969.

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