Agricultural practices which can increase SOC include, inter alia, agroforestry methods, use of cover crops, use of crops species and varieties with greater root mass and deeper roots, use of nitrogen-fixing leguminous plants, integration of livestock into the cropping system, largescale crop rotation, improved grassland management, increased residue retention and amendments such as compost and biochar.

This figure is extracted from the publication "The potential of carbon sequestration in the soil" available here.