Frequently Asked Questions
What is soil bulk density?
Soil bulk density is the mass of dry soil per unit of total volume, including pore space. It is expressed in g/cm³ or kg/m³. Typical values range from 1.0–1.6 g/cm³ for mineral soils. Higher values indicate compaction.
How does soil density relate to soil health?
Lower bulk density indicates more pore space, better aeration, root penetration, and water infiltration. Compacted soils (> 1.6 g/cm³) restrict root growth. Sandy soils typically have higher bulk density than clay soils.
What is particle density vs bulk density?
Particle density is the density of soil mineral particles themselves, typically 2.65 g/cm³ for most mineral soils. Bulk density includes air pores. Porosity (%) = (1 − Bulk Density / Particle Density) × 100.
What is g/cm³ in kg/m³?
1 g/cm³ = 1000 kg/m³. Since water has a bulk density of 1.0 g/cm³ (1000 kg/m³), soil bulk density expressed as a ratio to water equals the specific gravity of the bulk soil.
How do I calculate soil mass from bulk density?
Soil mass = Bulk Density × Volume. For a 20 cm deep layer on 1 hectare: Volume = 10,000 m² × 0.20 m = 2,000 m³. At 1.3 g/cm³ = 1,300 kg/m³: Mass = 1,300 × 2,000 = 2,600,000 kg = 2,600 tonnes.