# VR Lime Application Based on Soil pH Data

## Create a variable-rate (VRA) lime Rx prescription map from soil pH

Turn soil pH data into a machine-ready lime application map (Rx prescription). Use it to apply lime only where ROI is positive.

### Interactive walkthrough

{% @arcade/embed url="<https://app.arcade.software/share/b99IrB7wBzVDJu24MKFI>" flowId="b99IrB7wBzVDJu24MKFI" %}

### Economics example (VR vs flat 7,000 lb/ac)

This example compares variable-rate lime against a single flat rate across the field. Use it as a quick sanity check before exporting the Rx.

| Item                            | Value                    |
| ------------------------------- | ------------------------ |
| Field area                      | **33.91 ha**             |
| Avg applied rate                | **6,348.2 lb/ac**        |
| Lime price                      | $**0.02 / lb** (\~$40/t) |
| Total lime (calc)               | **523,853 lb**           |
| Material cost (field)           | $**10,477**              |
| Material cost (per ha)          | **\~**$**309/ha**        |
| Savings vs 7,000 lb/ac (total)  | $**441.9**               |
| Savings vs 7,000 lb/ac (per ha) | **\~**$**13.0/ha**       |

### Export the lime Rx prescription

* Export as ISOXML: [Export VRA map In ISOXML Format](/geopard-tutorials/product-tour-web-app/export-download/export-vra-map-in-isoxml-format.md)
* Other export options (SHP and more): [Export / Download](/geopard-tutorials/product-tour-web-app/export-download.md)


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