Comparison of techniques for ammonium-nitrogen (NH+4-N) content determination from plant samples digested by Kjeldahl method
1999
Jongruk Chanchareonsook | Somrutai Tancharoen | Chalalai Jirawattanachai (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Soils)
Techniques for ammonium nitrogen (NH+4-N) content determination from Kjeldahl digested plant samples were compare. Two experiments were preformed. The first experiment was by comparing between distillation and automated colorimetry (Salicylate-hypochlorite). The second experiment was by comparing between distillation and manual colorimetry (Salicylate-hypochlorite). The number of plant samples analysis were 36 for the first experiment and 38 for second experiment. The results indicated that the contents of NH+4-N determined by manual and automated colorimetries were simular and they were highly correlated to those determined by distillation with correlation (r) of 0.996** and 0.999** respectively
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