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Can Micronized Sulfur in Urea Reduce Ammoniacal Nitrogen Volatilization and Improve Maize Grain Yield?

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Abstract

Micronized sulfur (S) in urea may reduce nitrogen (N) loss by ammoniacal N (NH3–N) volatilization and provide a better use for S from oil refineries, thereby improving plant nutrition by providing N and S. The objective of this study was to evaluate the use of urea micronized with S (urea+S) to mitigate NH3–N volatilization and the efficiency of the urea+S as source of N and S for maize (Zea mays L.). Three field experiments were implemented, with maize grown in coarse-, medium-, and fine-textured soils and the following treatments: urea, ammonium nitrate, ammonium sulfate, urea+S enhanced with 13% elemental S (urea+SA), urea+S with 4% elemental S and 9% S in sulfate form (urea+SB), and a control without N application. The leaf N concentrations increased similarly for all the N sources. The leaf S concentrations were greater when the ammonium sulfate and urea+S were applied. The use of micronized S does not decrease the NH3–N volatilization from urea side-dress applied to maize. However, in comparison with ammonium sulfate, the urea+S are a viable alternative for supplying N and S to maize because of their greater operational efficiencies and due to their high N concentrations.

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Acknowledgments

We would like to thank the National Council for Scientific and Technological Development (CNPq) for an award for excellence in research to C.A.C. Crusciol.

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Correspondence to Carlos Alexandre Costa Crusciol.

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Crusciol, C.A.C., Almeida, D.S., Alves, C.J. et al. Can Micronized Sulfur in Urea Reduce Ammoniacal Nitrogen Volatilization and Improve Maize Grain Yield?. J Soil Sci Plant Nutr 19, 701–711 (2019). https://doi.org/10.1007/s42729-019-00070-7

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  • DOI: https://doi.org/10.1007/s42729-019-00070-7

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