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Ammonia Volatilization from Surface Applications of Ammonium Compounds on Calcareous Soils: III. Effects of Mixing Low and High Loss Ammonium Compounds

Fenn, L. B.
Soil Science Society of America journal 1975 v.39 no.2 pp. 366-368
ammonia, ammonium, ammonium carbonate, ammonium nitrate, ammonium nitrogen, ammonium sulfate, calcareous soils, mixing, volatilization
Losses of NH₃-N from surface applications of NH₄F and (NH₄)₂SO₄ to a calcareous soil were reduced by mixing either NH₄H₂PO₄ or NH₄NO₃ with these two compounds. Inclusion of 30% NH₄H₂PO₄ on an NH₄⁺ equivalent basis, in the (NH₄)₂SO₄ or NH₄F mixtures was sufficient to lower NH₃ losses to levels similar to those for NH₄H₂PO₄. Additions of NH₄H₂PO₄ to (NH₄)₂CO₃ had less effect on NH₃ loss and even with 1:1 mixtures there was only slight reduction in losses of NH₃. Reduced formation of unstable (NH₄)₂CO₃ rather than diminished rates of its decomposition, was believed to be responsible for the decline in NH₃ loss from mixtures of either NH₄F or (NH₄)₂SO₄ containing NH₄H₂PO₄. A conversion of at least 50% of (NH₄)₂SO₄ or NH₄F to (NH₄)₂CO₃ could lead to the observed maximum losses of NH₃.