Organic Carbon Content in NEH Soils are Very High (more than 1.5 %) But Mineralisable N is Generally Low. The Index Developed in India is not Suitable for NEH region Because Organic Matter is Present in Unhumified Form.
Microbial population and its activities other than fungi is generally low. So organic matter present in acid soils are not fully humified and N content is low in these soils though the organic matter is high in the the soil.