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In PNAS, Sebilo et al. (1) present the fate of labeled nitrate in the soil–plant system over three decades and attempt to determine “to which extent and over which time periods fertilizer N stored in soil organic matter is rereleased for either uptake in crops or export into the hydrosphere.” I suspect that this mechanism of immobilization-mineralization turnover described by Sebilo et al. (1) is valid only in cases when the external N supply has been low or in balance within the soil–plant system. In another case when the external N supply is in surplus the retention capacity, the soil matrix would have excess nitrate either directly derived …

Direct pathway of nitrate produced from surplus nitrogen inputs to the hydrosphere