Relationship between different fractions of N and characteristics of some dominant soil series of West Bengal

Department of Agricultural Chemistry and Soil Science, Bidhan Chandra Krishi Viswavidyalaya,

Mohanpur-741 252, Nadia, West Bengal, India

Manuscript received 08 September 2010, revised 05 July 2011, accepted 08 November 2011

A study was conducted to make a relationship between different forms of inorganic and organic N with some important physical and chemical properties of dominant soil series of West Bengal. Results revealed that in gene•·al, alluvial soil contains higher amount of different forms of N than that of soils of Red and Laterite zone. Amongst different forms, exchangeable NH₄⁺ and hydrolysable NH₄⁺ and amino acid fractions contributed more to the total pool of total N. Correlation studies pointed out a significant relationship between finer fractions of soils with fixed NH₄⁺, total hydrolysable organic N and total N. Total hydrolysable NH₄⁺ is also significantly correlated with C.E.C. of the soils.