铵根是由氨分子衍生出的带正电离子。氨分子得到一个质子（氢离子）就形成铵离子。由于化学性质类似于金属离子，故命名为“铵”，属于原子团。一般被视为金属离子。 其化学式：NH4；离子化学式：NH4+。水解呈酸性，正四面体型，与甲烷互为等电子体。铵根有三个共价键和一个配位键。
亚硫酸氢盐里的钙离子，镁离子，钠离子，铵根离子等化学基可以电离。
The chemical base for the bisulfite can be ionic calcium, magnesium, sodium or ammonium, Sulfite pulping can be carried out over a wide range of PH.
结果表明，在水冲洗条件下硝酸根和铵根的释放质量浓度呈一阶指数方程降低；
The results show that the releases of ammonium and nitrate nitrogen lower in exponential model, under the conditions of water washing;
这些转化结合子在高铵下表现出固氮活性，并能集聚在水稻根表，而野生型菌在相同条件下远离水稻根表。
They all accumulated on the surface of rice root system in the medium with higher ammonia concentration, while the wild type strains were removed from rice root surface in the same condition.
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