Ammonical nitrogen and nitrate nitrogen estimation procedure in soils in detail
https://www.aktion-wuestenwald.de/app/download/5794918017/Soil,+Plant+and+Water+Analysis+-+ICARDA+2013.pdf
You can check this ICARDA Manual for Mineral Nitrogen analysis(page 90) for the analysis of NH4-N and NO3-N. Hope it helps.
@ Reddy, Mineral N ( NH4+ and NO3-) you can determined using 2M KCL as the extracting solution in 1:5 (soil:KCl solution) ratio, Ammonium (NH4+) and nitrate (NO3-) plus nitrite (NO2-) are determined by steam distillation of ammonia (NH3) using MgO for NH4+ and Devardas Alloy for (NO3-). The distillate is collected in 2% boric acid and titrate with dilute acid. This method determines dissolved and adsorbed forms of ammonia, nitrate and nitrite in soils. For more details please look at Keeney and Nalson (1982) and Buresh et al. (1982).
JC's response is correct but both nitrate and NH3 in the extract can be measured colorimetrically. Look at the American water and waste water methods.
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