Biology and Fertility of Soils

, Volume 5, Issue 2, pp 171–174 | Cite as

Effect of ammonium fertilizer on NH3 loss and Ca, Mg, ammonium and nitrate content in a calcareous soil solution

  • L. B. Fenn
  • E. Wu
Article
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Summary

This study examined the effects of NH inf4 + fertilizers [(NH4)2SO4, (NH4)2HPO4, CO(NH2)2, NH4OH, and NH4NO3] on NH3 loss and the quantity of Ca + Mg, NH inf4 + and NO inf3 sup− in the solution of a calcareous soil (Harkey sicl, Typic Torrifluvent). Various NH4 fertilizers applied at a depth of 5 cm in the soil produced differing NH3 loss characteristics. Applying (NH4)2SO4 (AS) resulted in high volatile NH3 losses as compared with NH4OH (AH) and (NH4)2CO3 (AC). The AS treatment formed an equal molar amount of CaSO4, which increased the mobility of ammonium, while AH and AC treatments caused Ca precipitation and decreased ammonium mobility. Leaching the AS system before NH3 loss could occur resulted in the most rapid nitrification rate. Lower nitrification rates were found with AH and AC than AS under the same conditions. Surface placement of NH4 fertilizers resulted in variable leachate contents of Ca + Mg. Ammonium sulfate reacted with CaCO3 either to solubilize some Ca + Mg or simply to replace exchangeable Ca + Mg with NH4, while AH, AC, and (NH4)2HPO4 (DAP) precipitated essentially an equivalent molar amount of soluble and adsorbed Ca + Mg. Use of NH4NO3, which does not form an insoluble calcium precipitate, resulted in the leaching of an equivalent molar amount of exchangeable Ca + Mg from the Harkey soil.

Key words

Ca precipitation Calcium sulfate formation Ammonium carbonate Ammonium hydroxide Ammonium phosphate Ammonium sulfate Ammonia loss 
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Copyright information

© Springer-Verlag 1987

Authors and Affiliations

  • L. B. Fenn
    • 1
  • E. Wu
    • 1
  1. 1.Agricultural Experimental StationTexas A&M UniversityCollege StationUSA

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