Soil sample comes back from the lab. Now what?

Zone Forge turns it into a variable-rate prescription that ships to John Deere Operations Center. Every rate traces to a published university source you can look up. No proprietary algorithm, no machine-learning black box.

Built for the farmer on a phone, not a desk. Five minutes from upload to a prescription, at the back of the truck.

Pricing — from $0.25 per acre

Free, no card required. Two fields up to 100 acres each, two lifetime prescriptions, push to John Deere Operations Center.

Paid plans (annual):
• Starter — $199/yr · 5 fields, 250 ac · $0.80/ac
• Grower — $799/yr · 25 fields, 1,500 ac · $0.53/ac (most common)
• Operator — $3,299/yr · unlimited fields, 7,500 ac · $0.44/ac
• Enterprise — $4,999/yr · unlimited fields, custom (above 7,500 ac) · ~$0.25/ac

Founder Year 1: subscriptions started in the first 12 months from public launch get 20% off Year 1, auto-applied at checkout. Cancel any time; your data stays yours.

Cheaper than AgLeader SMS ($1,295/yr), Climate FieldView Premium scripts (~$2,250/yr), and custom agronomist Rx ($4,500–$12,000/yr) at every farm size in the 200–10,000 ac band. Full comparison at zoneforgetech.com/pricing.

What you get

• Three peer-reviewed recommendation tables — Iowa State PM 1688, Tri-State 2020, Penn State Agronomy Guide — plus 40+ land-grant extension publications across 50 states. Your rate cites your state's publication, not a national average.

• 14 nutrients (N, P, K, S, Mg, Ca, Zn, B, Fe, Mn, Cu, Mo, Cl, Na).

• Three philosophies — Sufficiency, Build-and-Maintain, or Hybrid (default). Pick what fits your tenancy and budget; the math is documented.

• Phosphorus extractant enforcement. Auto-detects Mehlich-3, Bray-P1, or Olsen and refuses to mix them silently. No more 20–40 lb/ac drift from mismatched calibrations.

• Multi-year buildup planning. Set your own soil-test target and timeline; the engine spreads the deficit and warns you when rate caps shorten the math.

• Stacked Litter → Potash → Nitrogen workflow. Drop a poultry-litter analysis, get three linked prescriptions, K and N credits subtracted per zone.

• Litter lab-report import. Drop the PDF or snap a photo; the form pre-fills itself. Built for AgroLab, Waters, Spectrum, A&L Heartland, and others.

• Lime engine, calibrated state by state — 50-state coverage. Calcitic vs dolomitic resolved from your soil Mg.

• Sample-to-lab kit. Print Avery labels with QR codes, tap "Bag it" after each sample, pick from six US labs (Waters Ag, A&L, Ward, Spectrum, Midwest, Brookside), buy a UPS or FedEx Ground label on your own account, get a push notification when the cooler arrives.

• Click-to-reassign zones. Five-zone default. Tap any contour to bump it to a different zone. Edit rates inline. Field totals and cost-per-acre update live.

• Direct push to John Deere Operations Center. OAuth, validated shapefile export, live status polling. If the platform hiccups, your prescription stays saved and one tap retries.

• Team chat with field context. Drop a field card into a message and your operator sees its shape, acres, crop, last work, and prescription-readiness. Voice notes with transcription, group chats, @-mentions.

• Printable one-page field reports. Map, per-zone table, sources, your inputs — hand it to your agronomist, retailer, banker, or landlord.

Studio for agronomists

Managing many client farms? Studio adds white-label PDFs, a full audit log per client, and the same push into each client's equipment. $499 per year for unlimited clients, or $19 per active client per month for clients below Operator (Operator and Enterprise clients are free to manage). Published, not "contact sales."

Sign in at app.zoneforgetech.com. Or open the free lime calculator first — no signup, same engine: zoneforgetech.com/lime-calculator.

Privacy: zoneforgetech.com/privacy. Built by Zone Forge Technologies LLC.