Nutrient Balances in Ricefields

Greenland (1997) has compiled realistic average annual nutrient balances for wetland ricefields pre- and post-1960 from probable inputs and outputs. Inputs come from rainfall, R, irrigation and floodwater, F, sediments, S, nitrogen fixation, N, and manures and fertilizers, M. Outputs are due to crop removals in 

The Biogeochemistry of Submerged Soils Guy Kirk 2004 John Wiley Sons, Ltd ISBN 0-470-86301-3 

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