水葫芦氮素养分测定方法比较

水葫芦氮素养分测定方法比较硫酸-双氧水消煮（不含硝态氮）水杨酸-Zn粉还原法（含硝态氮）含N量（g/kg）均值（g/kg）标准差%含N量（g/kg）均值（g/kg）标准差%蒸馏滴定法21.4322.160.4922.2525.123.1822.6923.2222.3629.89氨氮测定（靛酚蓝比色法）31.8632.660.8443.2939.652.4333.9336.4032.2139.25NO3--N测定（紫外比色）9.039.870.56-6.25-6.300.4310.43-5.7010.14-6.95总N测定（过硫酸钾氧化—紫外比色）41.9942.070.4942.8141.42