Soil Bulk Density

Soil bulk density tells you how much dry soil mass is packed into a given volume of soil, including the pore spaces between particles. It works because density is defined as mass divided by volume, so a larger mass in the same volume means the soil is more compacted, while a smaller mass means it is looser and more porous. In agriculture, this helps indicate how easily roots can grow, how well water can move through the soil, and how much air is available to plants.

Use this formula when comparing soil compaction across fields, depths, or management practices such as tillage and grazing. It is also useful in soil sampling, land assessment, and diagnosing problems like poor drainage or restricted root growth.

• Using wet soil mass instead of dry soil mass
• Confusing bulk density with particle density
• Measuring the wrong volume, such as only the solid particles instead of the whole soil core