Laboratory technician checking a moisture worksheet
Subtract tare and reproduce gravimetric water content.
Enter matched tare, wet combined mass, dry combined mass and reported percentage.
Sees dry soil, water mass and signed report difference.
Tared Gravimetric Soil-Water Record Check
Reconcile tared container-plus-wet and oven-dry soil masses with a laboratory-reported gravimetric water-content value.
Built for Soil Science1 documented formulaFocused single-task workflowPrivate in your browser
Use this result well
A quick decision brief for this specific tool
Inputs that matter
Tared container, container-plus-wet, container-plus-constant-oven-dry and laboratory-reported gravimetric water-content records
Output to expect
Net dry soil, water mass, calculated dry-mass-basis percentage and signed laboratory difference
How it works
Reconciles a documented gravimetric mass record; it does not infer volumetric water, field capacity, plant availability or irrigation timing
- Match sample identity, depth/time, sealed transport, tare, drying temperature/time/constant-mass rule, cooling and balance precision.
- Use measured bulk density and method-matched retention/field evidence for volumetric, field-capacity, plant-available-water or management interpretations.
Choose your path
Built around the job you need to finish
Reconcile a tared wet/oven-dry soil mass record with laboratory-reported gravimetric water content on a dry-mass basis.
Researcher reviewing sample handling
Keep depth/time, sealing and drying method attached.
Review collection/transport, constant-mass and balance records with the result.
Does not compare incompatible sample or method bases.
Grower seeking irrigation timing
Avoid treating gravimetric content as volumetric availability.
Use bulk density, retention/field measurements, crop and rooting evidence separately.
Does not irrigate from one lab mass percentage alone.
Authoritative checks for this tool
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
- Kellogg Soil Survey Laboratory Methods Manual, Version 6.0USDA Natural Resources Conservation Service · Official tared-container, oven-dry and water-content laboratory procedures and calculations.
- Soil Survey Field and Laboratory Methods ManualUSDA Natural Resources Conservation Service · Official gravimetric water-content, sample handling, drying and water-retention method context.
- Soil Survey ManualUSDA Natural Resources Conservation Service · Official distinction between gravimetric water content, water state, suction and water-retention interpretation.
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Reference & details
How it works
Updated August 2026
How it works
Updated August 2026Subtract the Tare
Net oven-dry soil mass is container-plus-dry mass minus the tared container. Water mass is container-plus-wet minus container-plus-dry for the same sealed sample record.
Use the Dry-Mass Basis
Gravimetric water content equals water mass divided by net oven-dry soil mass, multiplied by 100. It is not a volumetric percentage.
Compare the Laboratory Record
Calculated minus laboratory-reported gravimetric water gives a signed difference. Preserve sampling, sealed transport, drying-to-constant-mass, cooling, and balance details.
Updated: August 2026
Example Scenarios
Reproduce a laboratory dry-mass-basis percentage from the same tare, wet, and oven-dry mass record.
Use a discrepancy to investigate sealing, transport delay, tare, drying, cooling, balance, or transcription records.
Retain the lab mass percentage while obtaining bulk density, retention, crop, root-zone, and field evidence for management.
Common Mistakes to Avoid
Common Mistakes to Avoid
Failing to subtract the container tare
Use the same tared container to isolate net dry soil and water masses before calculating the percentage.
Treating gravimetric percentage as volumetric or plant-available water
Volumetric conversion needs method-matched bulk density; availability and irrigation timing also require water-retention, crop, rooting, and field context.
FAQ
Wet and dry measurements include the container. Subtracting its mass isolates the dry soil denominator and prevents a biased percentage.
Gravimetric water content is conventionally reported on a dry-mass basis: water mass divided by oven-dry soil mass.
Yes. That produces zero water mass, though sample handling and drying records should still be reviewed.
It can for some organic or highly water-holding materials because water mass is compared with dry mass; verify the material and method.
No. Irrigation decisions require crop, rooting depth, soil-water retention, volumetric or tension measurements, weather, and field-management context.
About Tared Gravimetric Soil-Water Record Check
This worksheet checks a tared gravimetric soil-water mass record against the laboratory report. It separates dry-mass arithmetic from volumetric, field-capacity, plant-availability, and irrigation interpretations.