2种纳氏比色法检测土壤铵态氮的对比

笔者对2种纳氏试剂比色方法检测土壤铵态氮进行了对比性试验，一种是常规的纳氏试剂比色法（常规法），一种是改进后的纳氏比色法（速测法），试验证明了速测法具有检测线性范围宽0~168mg/kg的优点，整个过程检测时间为25min，比常规法缩短一半；显色灵敏，显色稳定时间长，可稳定几小时以上；检测结果直接显示土壤中养分含量；操作方便快捷；成品试剂，不需要操作人员自配；检测成本低等优点。便携式速测仪及配套的检测方法满足基层测土配方施肥使用。

Comparison of Two Kinds of Nessler Colorimetric Method to Detect Soil Ammonium Nitrogen

In this paper, two kinds of nessler's reagent colorimetric method of the comparative experiment to detect soil ammonium nitrogen, one is a kind of conventional nessler's reagent colorimetric method (routine method), another is a kind of improved method of nessler (speed measuring method), the test proved that the measuring method with wide linear range 0 ~ 168 mg/Kg; The whole process of testing time for 25 min, that than the conventional method to shorten half; Sensitive color, color stability time is long, it can be stable for a few hours; Test results showed that the soil nutrient content directly; Convenient operation; Finished product reagent, do not need to operating personnel from the match; Detection of low cost advantages. Portable measuring instrument and the detection method of form a complete set to meet basic measuring soil fertilizer use.