Effects of atmospheric ammonia (NH3) on terrestrial vegetation: a review.

By S. Krupa. Environmental Pollution, 2003

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Growth of microalgae on undiluted anaerobic digestate of piggery effluent with high ammonium concentrations (2017, background): “The combination of high ammonia (around 1000 to 2000 mg N-NH4 L −1) and basic pH (above 8) in ADPE shifts the chemical equilibrium from NH4 to NH3 which is toxic to most organisms (microorganisms, aquatic ecosystems and terrestrial life such as vertebrates) [15, 16, 17].”
Nitrogen as a threat to European terrestrial biodiversity - Chapter 20 (2011, background): “Studies have mostly concentrated on crops and saplings, but studies with native herbaceous or shrub species in open-top chambers have also demonstrated leaf injury, changes in physiology, and growth reductions at high concentrations of airborne N pollutants (Pearson and Stewart, 1993 ; Grupa, 2003).”