The Hidden Value in Your Soil Test
How do I know if what I'm doing is working?
Every soil test holds more information than a list of nutrient levels. The Soil Efficiency Index (SEI™) unlocks that value — turning your existing soil test data into a single, powerful score that reveals how efficiently your soil system is working and whether your management decisions are moving the needle.
THE PROBLEM
Every Decision Costs Money. The Benefit Is Hard to Measure.
Growers make dozens of management decisions every year.
Apply lime or not? Adjust fertilizer rates? Plant a cover crop? Reduce tillage? Add compost or manure? Invest in soil building practices?
Each decision has a cost. But without a way to measure the return, most growers are left guessing whether their investments are actually improving their soil system — or just adding to their expenses.
The problem isn’t a lack of data. Most growers already have soil tests. The problem is turning that data into confident decisions.
THE MISSING MEASUREMENT
Lots of Data. No Clear Direction.
You can’t manage what you can’t measure.
Imagine checking your retirement account and instead of seeing one clear account value, you were shown hundreds of individual stock prices with no total, no trend, and no way to know if you were ahead or behind.
That’s exactly how most soil testing works today.
Pages of numbers. Dozens of individual readings. But no single measure of whether your soil system is improving — or whether your management decisions are paying off.
"Without a single score, you're guessing."
INTRODUCING SEI™
Introducing the Soil Efficiency Index (SEI™)
One score that reveals how efficiently your soil system works.
SEI™ is the credit score for your soil system.
Just like a credit score takes dozens of financial variables and combines them into one number you can track and improve over time, SEI™ takes your existing soil test data and converts it into a single, actionable score that tells you exactly where your soil system stands — and what to do next.
No additional testing required. No added complexity. The information was always there. SEI™ simply reveals it.
- Easy to Understand — One score. One direction.
- Easy to Track — Watch your soil system improve over time.
- Easy to Act On — Clear priorities, not pages of data.
HOW SEI WORKS
From Soil Test to Smarter Decisions in Three Steps
Step 1 — Upload Your Soil Test
Submit your existing soil test through your account portal. SEI™ works with most standard agricultural soil tests. Required inputs: OM, CEC, pH, Ca, Mg, K, P.
Step 2 — Receive Your SEI Report
Within 2–3 business days, you’ll receive a professional PDF report with your SEI™ score, efficiency category, constraint analysis, and prioritized improvement opportunities.
Step 3 — Take Action and Track Progress
Within 2–3 business days, you’ll receive a professional PDF report with your SEI™ score, efficiency category, constraint analysis, and prioritized improvement opportunities.
Create Account
Receive SEI Report
Understand Constraints
Take Action
Track Progress
Every management decision leaves a footprint in the soil. SEI™ helps you measure whether those decisions are moving your soil system in the right direction.
Who We Serve
From Soil Test to Smarter Decisions in Three Steps
SEI™ integrates the four key factors that determine how efficiently your soil system works
Driver 1 — Organic Matter: The Biological Engine
Fuels soil life, drives biological activity, nutrient cycling, and overall soil function.
Driver 2 — Calcium Balance: The Structural Foundation
Builds strong soil structure, improves aggregation, infiltration, and root growth.
Driver 3 — CEC: The Nutrient Storage System
Holds and exchanges nutrients so plants have access when they need it most.
Driver 4 — Hydrogen Saturation: The Acidity Pressure
Indicates acidity pressure in the soil that affects nutrient availability and microbial activity.
When these four drivers are in balance, your soil system works efficiently. SEI™ turns that complexity into one powerful, trackable score.
THE SEI SCORECARD
Know Where You Stand. Know Where to Focus.
Your SEI™ score places your soil system into one of four categories — each with a clear management focus.
| Score | Category | What It Means |
|---|---|---|
| < 25 | Inefficient | Soil system constraints dominate. Nutrients are lost, tied up, or inconsistently utilized. |
| 25–40 | Functional | System is working but key limitations remain. Fertilizer response is variable. |
| 40–55 | Efficient | Good balance of nutrient storage, cycling, and structure. Strong fertilizer response. |
| > 55 | High Efficiency | Highly optimized soil system. Strong nutrient use efficiency and resilient production. |
Measure what matters. Manage what counts. Maximize your return.
NOT ANOTHER SOIL HEALTH SCORE
SEI™ Is Different. It's Built for What Really Matters.
SEI™ is not a soil health score. It’s a measure of soil system efficiency — focused on functional outcomes that directly drive profitability and sustainability.
Better Nutrient Retention
Keep nutrients in your soil where crops can access them — reducing loss and waste.
Better Nutrient Cycling
Enhance natural cycling so nutrients are available when your crops need them most.
Better Fertilizer Use Efficiency
Get more crop nutrition from every dollar of inputs you apply.
Better Return on Management Investment
Maximize profitability and the return on every decision you make in the field
SEI™ isn't just another score. It's a measure of what matters most. Built on science. Focused on outcomes. Designed for your bottom line.
WHY THIS MATTERS
Better Measurement. Better Insight. Better Decisions.
A Benchmark
Enhance natural cycling so nutrients are available when your crops need them most.
A Progress Tracker
Track changes over time and see real improvement. Watch your SEI™ score rise as your management decisions take hold.
A Decision Validation Tool
Stop guessing whether your investments are working. Validate every management decision with a score that reflects real soil system performance.
BACKED BY SCIENCE
Validated. Science-Based. Built to Perform.
SEI™ has been evaluated against aggregate stability — one of the most reliable indicators of overall soil function.
The result: SEI™ explains twice as much variation in aggregate stability as organic matter alone using data from the Soil Health Institute’s 2024 North American dataset.
Higher SEI™ means better soil function. That’s not a claim — it’s a measured outcome.
Data Source: Soil Health Institute (2024). North American Project to Evaluate Soil Health Measurements Dataset.
PRICING PREVIEW
Start With One Test or Scale Across Your Operation
Every plan includes a professional PDF report delivered within 2–3 business days.
SEI Snapshot
$4.99 / per soil test
Know your score. Understand your constraints. Identify your opportunities.
SEI Essentials
$39.99 / up to 10 soil tests
Compare fields. Prioritize improvements. Track what’s working
SEI Advantage
$199.99 up to 50 soil tests
Complete farm assessment. System-wide analysis. Professional reporting package.
SEI Essentials
Custom Pricing
Built for organizations, retailers, consultants, and ag programs
Your Soil Test Already Has the Answers. SEI™ Reveals Them.
Better insight leads to better decisions. Better decisions lead to better outcomes. Better outcomes create a stronger future for your operation.
Upload your soil test today and receive your professional SEI™ report within 2–3 business days. No additional testing required — just the data you already have.
Let's Talk Soil
Whether you have a question about SEI™, need help choosing a plan, or want to explore enterprise options — reach out and we’ll get back to you promptly.
- sdgplantnutrition@gmail.com
- (405) 762-2901
- Springdale, AR 72762
Questions? Email sdgplantnutrition@gmail.com