Role of nitrogen fertilization in sustaining organic matter in cultivated soils.

  title={Role of nitrogen fertilization in sustaining organic matter in cultivated soils.},
  author={Jagdish Kumar Ladha and C. Kesava Reddy and Agnes Tirol Padre and Chris van Kessel},
  journal={Journal of environmental quality},
  volume={40 6},
Soil organic matter (SOM) is essential for sustaining food production and maintaining ecosystem services and is a vital resource base for storing C and N. The impact of long-term use of synthetic fertilizer N on SOM, however, has been questioned recently. Here we tested the hypothesis that long-term application of N results in a decrease in SOM. We used data from 135 studies of 114 long-term experiments located at 100 sites throughout the world over time scales of decades under a range of land… 

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