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nitrate ammonium
The ratio of nitrate/ammonium in the soil decreases from a high level in the early stages of old field succession to a low level in the climax in the tall grass prairie region of central Oklahoma.
      
Soil nitrate and the nitrate/ammonium ratio correlated positively with average N oxide fluxes.
      
The optimum nitrogen concentrations for embryogenesis were between 3.75 and 15 mM nitrogen with a nitrate/ammonium molar ratio of 2:1 or 1:2.
      
Greater changes in solution pH occurred when plants were grown with 39:1 compared to 9:1 and 3:1 nitrate/ammonium ratios.
      
The genotypes maintained their relative differences in Al toxicity tolerance when plants were grown separately or together in the same container with Al and with different nitrate/ammonium ratios.
      
The adenylate energy charge in roots of plants under nitrate nutrition showed a smaller decrease under anaerobic environmental conditions than plants grown with ammonium or nitrate/ammonium.
      
The average ratio of nitrate/ammonium uptake was 0.69 in proximal and 0.20 in distal areas.
      
Sulfate, nitrate ammonium ions are major contributors to the total PM2.5.
      
 

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