How to transfer volumetric soil moisture to mm of soil moisture?

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Muhammad Arsalan Farid

To convert volumetric soil moisture (SM) readings to millimetres of soil water content (SWC), you are on the right track with the formula you've mentioned. The conversion involves understanding the relationship between the volumetric water content, measured soil depth, and the soil's bulk density. Here’s a detailed explanation of the process:

Volumetric Soil Moisture (SM(vol)): This is typically expressed as a percentage and represents the volume of water relative to the volume of soil. For example, a volumetric moisture content of 30% means 30 units of water for every 100 units of soil.

Soil Depth: This is the depth at which the soil moisture content is measured. In your case, it’s 10 cm.

Soil Bulk Density: The soil mass in a given volume typically expressed in g/cm³. Bulk density can vary based on soil type, structure, and compaction. For example, a bulk density of 1.3 g/cm³ means 1.3 grams of soil occupies one cubic centimetre.

Conversion Formula: The formula you are using is essentially correct. It involves multiplying the volumetric soil moisture by the soil depth and the bulk density. The formula looks like this:

SM(mm)=SM(vol)×SoilDepth(cm)×SoilBulkDensity(g/cm^3)

Convert the volumetric soil moisture from a percentage to a decimal by dividing by 100.

Ensure that the soil depth is in centimetres.

The bulk density should also be in g/cm³.

Convert the volumetric soil moisture from a percentage to a decimal by dividing by 100. Ensure that the soil depth is in centimetres. The bulk density should also be in g/cm³.

Why This Works: This conversion calculates the water volume in a given soil volume and then converts that volume into a millimetre depth. Since 1 cubic centimetre of water is equivalent to 1 millilitre, and there are 10 millimetres in a centimetre, this calculation effectively converts the volumetric water content into a depth of water.

Godwin Sabah

To convert soil moisture measured in percentage volume (% vol) to soil water content (SWC) in millimeters (mm), you need the bulk density of the soil. The bulk density represents the mass of the soil per unit volume. Here's how you can convert the measurements:

1. Multiply the bulk density of the soil by 10 to convert it to mm depth.

For example, if the bulk density is 1.3 g/cm³, then the conversion factor would be 1.3 * 10 = 13 mm/cm³.

2. Multiply the measured soil moisture in percentage volume (% vol) by the conversion factor obtained in step 1.

For example, if the measured soil moisture is 30% vol, then the converted soil water content would be 30% * 13 mm/cm³ = 3.9 mm.

Keep in mind that this conversion assumes the measurement depth is 10 cm and the bulk density remains constant for the entire depth. If there are variations in depth or bulk density, you may need to apply different conversion factors accordingly.