Dr Ranendu Ghosh,

Have you seen

"Subregional and downscaled global scenarios of nutrient transfer

in river basins: Seine‐Somme‐Scheldt case study" by Vincent Thieu et al, in

GLOBAL BIOGEOCHEMICAL CYCLES, VOL. 24, GB0A10, doi:10.1029/2009GB003561, 2010

If not see URL below:

http://onlinelibrary.wiley.com/doi/10.1029/2009GB003561/pdf

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V Jayaraman

Another paper I think that could be of some relevance is

"A spatially explicit methodology to quantify soil nutrient balances and their uncertainties at the national level" by J. P. Lesschen et al

Nutr Cycl Agroecosyst (2007) 78:111–131

DOI 10.1007/s10705-006-9078-y

http://paperity.org/p/12714391/a-spatially-explicit-methodology-to-quantify-soil-nutrient-balances-and-their

Thank you Dr Jayaraman. I will go through the papers.