Soil test trends

One soil history. Every test date on one sheet.

Fictional example history.
You can start your own history, enter results and save a file to keep.
Imported files stay on your device.

Soil historyTests to showDates to show

Scroll within the sheet to see more dates. Mineral labels stay in place. Methods and reporting units stay separate.

Follow one result over time

Result to plot

A blank result means no result in this test. Values such as <0.02, >20 and starred entries retain their source qualifiers. They are not plotted as exact measurements.

Start a separate soil history

Add or correct a test result

Open Logan Labs PDFs or spreadsheets in the Calculator, review the results, then use Save test results to Trends.
You can also enter or correct a verified report here.
Leave unreported values blank and retain reporting limits.

Source and interpretation

This demonstration contains three fictional dates. It shows the sheet, graph and editing controls without exposing private test histories. It does not establish cause and effect.

New histories and results stay in this browser when storage is available. Save a history file for a portable backup. Opening one replaces the current displayed histories and can be undone until the next change. A browser profile or cleared browser data is not a permanent archive.

Use Save all histories and Open saved histories to carry records between devices. The CSV exports the selected soil history with all its dates and methods. It is a single worksheet layout, not a backup for reopening here.

Living Soil Supplies · October 14, 2026. Files opened here stay in your browser.

Build your own version

Copy a starting prompt into ChatGPT or another coding assistant, then adapt it to your needs.

These prompts describe the framework and workflows. They are not the source code, a bundled dataset or a promise of an identical result.

Check the reuse terms for any third party text, images, recordings or datasets before including them in your version.

Starting prompt for Living Soil Supplies

Build a mobile friendly soil and water test workspace inspired by Living Soil Supplies.
Start with a homepage that links to a calculator, pots and beds planner, water readouts, test history, report viewer, learning resources and offline access.
Keep each task clear and put long explanations in expandable sections.
Use short sentences with space between them.

Let people open separate Logan Labs Mehlich 3 and saturated paste reports, choose the matching samples and review imported values before using them.
Support local PDF and spreadsheet parsing when practical, plus manual entry.
Keep original units, chemical forms, sample identifiers and test methods visible.
Missing, uncertain or unsupported values must remain unknown rather than become zero.
Use fictional examples until the user confirms their own values.

Calculate soil mass from confirmed dimensions, depth and bulk density.
Show nutrient gaps, attributed ratio references, application limits and product amounts with the arithmetic explained.
Allow multiple products for one element and keep shares at 100 percent.
Count all known accompanying nutrients without adding the same contribution twice.
Keep nitrate results separate from total nitrogen additions.
Keep Soil Symbiotics out of the mineral amendment selectors and describe any verified directions separately.
For water reports, show measured concentrations, ratios and amounts already present in the selected water volume.
Do not treat the water readout as a balancing prescription.

Process personal reports locally, provide backup and restore files, and test calculations with synthetic fixtures.
Package the interface and permitted data for offline use.
Explain which external resources still need internet access.
Cite sources and dates for technical targets and product analyses.
Do not copy private reports, paid course material or restricted datasets.
Ask for reuse terms before redistributing third party content.

Deliver a working first version, instructions and a list of unverified assumptions.
To adapt this framework to another topic, replace the data and calculation rules while preserving review, provenance, local storage and export.

Download build prompt

Copy the prompt or download a text file.