@article{icrisat3963,
           title = {A rapid method for determination of nitrate, nitrite, and ammoniacal nitrogen in soils},
       publisher = {Kluwer},
          author = {K L Sahrawat and R Prasad},
           pages = {305--308},
            year = {1975},
          volume = {42},
         journal = {Plant and Soil},
          number = {1},
             url = {http://oar.icrisat.org/3963/},
        abstract = {A rapid procedure is proposed for simultaneous determination of NH4-,
NO{\texttt{\char126}}-, and NO3-N in field moist samples. The procedure involves extraction,
with Morgan's solution followed by determination of NH4-N by Nessler's
reagent, NO2-N by x-naphthylamine and sulphanilic acid and NOa-N by
phenol-disulphoric acid. The method will suit small laboratories and 50 to 75
samples can be analysed in a day.}
}