Banding of sulfur and sulfuric acid in soil in which iron‐inefficient plants were grown

Abstract

Abstract Iron‐inefficient soybeans (Glycine max L. cultivar PI54619–5–1) were grown in a glasshouse in calcareous Hacienda loam soil with S and H2SO4 sufficient to neutralize the CaCO3 and mixed throughout the soil. They were also applied in the lower one‐half of the soil in the pots. The H2SO4 regardless of how it was placed increased Fe uptake, but the S was much less effective. Both S and H2SO4 increased Mn uptake, but the S did not increase Al uptake while the H2SO4 increased it considerably. Sulfur and a commercial form of Fe oxide were mixed singly and together in a band in the middle of pots of soil in which were grown Fe‐inefficient rice (Oryza sativa L. cultivar Norin 8), corn (Zea mays L. Ys1 /Ys1 inbred), soybeans, and sorghum (Sorghum bicolor L. cultivar Combine Kafir 60). Each of the five species responded differently. Rice responded only slightly to the Fe2O3 and considerably to the S. Corn responded somewhat to the Fe2O3, but was injured by Zn toxicity with the S application which seemed no...