mollic horizon A surface horizon of mineral soil that is dark in colour, and relatively deep, and contains (dry weight) at least 1 per cent organic matter or 0.6 per cent organic carbon, the determination of either being acceptable. It is the diagnostic horizon of Mollisols and is associated with base-rich materials and grassland vegetation.

mollic horizon A surface horizon of mineral soil that is dark in colour, and relatively deep, and contains at least 1 per cent organic matter, or 0.6 per cent organic carbon, the determination of either being acceptable. It is the diagnostic horizon of Mollisols and is associated with base-rich materials and grassland vegetation.

mollic horizon Surface soil horizon of mineral soil that is dark in colour, and relatively deep, and contains (dry weight) at least 1% organic matter, or 0.6% organic carbon, the determination of either being acceptable. It is the diagnostic horizon of Mollisols and is associated with base-rich materials and grassland vegetation.