marginally significantP = 0.08
Ammonium chloride, ammonium hydroxide, ammonium phosphate, and ammonium sulfate increased the ammonium content of the media ( t = 6.31, 3.85, 6.79, and 7.10, respectively, df = 12, P < 0.05) whereas ammonium bicarbonate produced a marginally significant increase ( t = 2.64, df = 12, P = 0.08).