Various Potassium salts (0.5 M K2SO4, 1 M KCl and M CH3 COOK) were tested for the extraction of inorganic nitrogen (NH4, NO3 & NO2-N) from coal mine soils. Although the amount of NH4-N extracted by various extractants was significantly different, there was no regular increase/decrease in the levels of NH4-N extracted by the various salt solutions. The amount of NO3-N extracted by KCl was significantly more compared to K2SO4 or CH3COOK which was attributed to the Cl ions interference in the colorimetric determination of NO3-N. The K2SO4 salt solution did not interfere and was, therefore, recommended to be used as an extractant for the colorimetric determination of soil inorganic nitrogen.
FATEH UDDIN KHAND ,AHMED FAROOQ ANSARI ,M Y KHUHAWAR ,SAIF ULLAH MEMON ,
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