SYNTHETIC DEMONSTRATION — not measured farm evidence.

# Streamline Soil & Water Lab

Calculation version: 1.0.0

## What the records establish

```json
[
  {
    "kind": "laboratory_inventory",
    "accepted_results": 4,
    "sample_count": 2,
    "matrices": [
      "irrigation_water"
    ],
    "evidence": [
      {
        "filename": "synthetic-water-results.json",
        "record_index": 1,
        "source_row": 2,
        "source_page": null,
        "source_id": null
      },
      {
        "filename": "synthetic-water-results.json",
        "record_index": 2,
        "source_row": 3,
        "source_page": null,
        "source_id": null
      },
      {
        "filename": "synthetic-water-results.json",
        "record_index": 3,
        "source_row": 4,
        "source_page": null,
        "source_id": null
      },
      {
        "filename": "synthetic-water-results.json",
        "record_index": 4,
        "source_row": 5,
        "source_page": null,
        "source_id": null
      }
    ]
  }
]
```

## Calculations

```json
[
  {
    "kind": "comparable_lab_change",
    "site": "Demo Farm",
    "zone": "Well head",
    "analyte": "electrical_conductivity",
    "analyte_basis": "not_applicable",
    "matrix": "irrigation_water",
    "method": "Conductivity cell; reported at 25 C",
    "laboratory": "Synthetic Example Laboratory",
    "context_key": "Raw well water before treatment",
    "units": "mS/cm",
    "earlier": {
      "sample_id": "DEMO-W1",
      "date": "2026-08-01",
      "value": 1.2
    },
    "later": {
      "sample_id": "DEMO-W2",
      "date": "2026-08-15",
      "value": 1.5
    },
    "change": {
      "absolute": 0.30000000000000004,
      "percent": 25.000000000000004,
      "percent_unavailable_reason": null
    },
    "interpretation": "A numerical difference between the supplied samples; no improvement, deficiency, amendment need or causal effect is established.",
    "assumptions": [
      "The declared analytical method and sampling context are correct.",
      "Any reported uncertainty is retained; significance is not inferred."
    ],
    "evidence": [
      {
        "filename": "synthetic-water-results.json",
        "record_index": 1,
        "source_row": 2,
        "source_page": null,
        "source_id": null
      },
      {
        "filename": "synthetic-water-results.json",
        "record_index": 2,
        "source_row": 3,
        "source_page": null,
        "source_id": null
      }
    ]
  }
]
```

## Assumptions


## Possible explanations

- Sampling location, extraction method, laboratory handling and crop context can affect results; this report does not identify a cause.

## Missing or rejected evidence

- {"code":"lab\_comparison\_blocked","severity":"warning","message":"Retained sample DEMO-W2; numerical comparison requires confirmation of: method, value, qualifier=unknown, unconfirmed\_extraction.","evidence":\[{"filename":"synthetic-water-results.json","record\_index":4,"source\_row":5,"source\_page":null,"source\_id":null}\]}
- {"code":"insufficient\_lab\_history","severity":"warning","message":"Only one comparable result is available in this method/context group; no temporal change is calculated.","evidence":\[{"filename":"synthetic-water-results.json","record\_index":3,"source\_row":4,"source\_page":null,"source\_id":null}\]}

## Next measurements or inspections

- Confirm missing methods, analyte bases, sampling context and uncertain extraction fields before comparing results.
- Give the agronomist the original laboratory results and the method-matched comparison. Reference ranges and amendment prescriptions are not supplied.

## Sources and correction history


The companion report.json retains the complete source mappings, normalized/original values, evidence row references, corrections, and all flags. No sample records substitute for failed uploads.