Reconcile matched field-capacity and permanent-wilting-point records for one soil layer, including rock-fragment volume and a laboratory comparison.
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Reconcile one matched soil-layer field-capacity and permanent-wilting-point record with rock-fragment volume and a laboratory-reported layer available-water amount.
Reproduce fine-earth and fragment-adjusted available water from matched retention records.
Enter field capacity, wilting point, layer thickness, rock-fragment volume and the laboratory layer amount.
Sees both layer calculations and the signed laboratory difference.
Keep horizon depth, fragment volume and retention method attached to the number.
Use values from the same layer and compatible measurement basis, then retain map-unit and sampling context externally.
Does not generalize one layer result to the whole profile.
Avoid treating one laboratory layer as plant-available root-zone water.
Reconcile each layer separately and use rooting, salinity, compaction and current field-water evidence outside the calculator.
Does not schedule irrigation from this arithmetic alone.
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.
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Use field capacity and permanent wilting point from the same sampled layer and a compatible laboratory method and basis. The fine-earth volumetric difference is field capacity minus permanent wilting point.
The calculator multiplies the volumetric difference by layer thickness, then multiplies by the fine-earth volume fraction, 1 minus rock-fragment percent divided by 100. It reports inches of water for this layer only.
The signed difference compares the calculated fragment-adjusted amount with the entered laboratory layer amount. Root-zone storage requires layer-by-layer data plus rooting, salinity, compaction and current field conditions.
Updated: August 2026
Reproduce a reported layer amount from matched retention measurements, layer thickness and fragment volume.
Keep horizon depth, fragment abundance, sampling location and retention method attached to the calculated record.
Reconcile each layer before combining a profile externally; do not infer irrigation timing or plant access from a single layer.
Use matched records from the same layer and compatible retention method, pressure and reporting basis; preserve the laboratory method identifiers.
Calculate each layer separately, account for rock fragments, and evaluate rooting, salinity, compaction and field water before making management decisions.
This tool is a transparent reconciliation worksheet for one documented soil layer. It does not predict root-zone storage, irrigation need or plant-available water under current field conditions.