Turn Agricultural Science into Measurable Growth
SDG helps agricultural companies, consultants, and growers validate products, improve nutrient-management decisions, and demonstrate results under real field conditions.
SCIENCE THAT PERFORMS IN THE FIELD
Led by Dr. AJ Foster, a Certified Professional Agronomist and Certified Crop Adviser with more than two decades of experience in soil science, crop nutrition, product validation, and commercial agriculture.
THE PROBLEM
Agriculture Does Not Lack Data it Lacks Connected Decisions
A soil test, plant analysis, weather, yield goal, or product trial data is valuable. The greater value comes from connecting them, understanding the system, choosing the right intervention, measuring the response, and learning from the outcome.
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
Use the report to prioritize management actions, establish a baseline, and compare future soil tests to determine whether the system is improving.
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
Growers tracking field improvement; consultants strengthening recommendations; retailers differentiating service; laboratories adding decision value; researchers and agricultural companies evaluating management practices and products.
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.
| SEI Score | What It Means | What To Do |
|---|---|---|
| 0–25: Watch closely | The soil may need more support to supply nutrients consistently. | Protect against nutrient loss and plan 3–4 plant checks during the season. |
| 25–50: Check and adjust | Conditions are improving, but crop response may still vary. | Check plants before key growth stages and adjust the plan as needed. Plan 2–3 checks. |
| 50–75: Stay on track | The soil provides a more dependable growing environment. | Focus 1–2 plant checks on decisions where an adjustment could matter most. |
| Above 75: Run efficiently | The soil setting supports a simpler monitoring plan. | Use 1–2 targeted plant checks and avoid inputs the crop does not need. |
Measure what matters. Manage what counts. Maximize your return.
Product Validation
Agronomy Consulting
Soil Efficiency Index™
Design credible field programs, test agricultural products under relevant conditions, and translate results into claims that technical and commercial teams can use.
Improve soil fertility, crop nutrition, nutrient-use efficiency, and in-season decision-making while balancing science with economics.
Turn routine soil-test data into a practical measure of soil-system efficiency and track whether management is improving function over time.
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.
Base Plan
$4.99 / per soil test report
- A single soil test upload
- Soil efficiency index (SEI) assessment
Starter Plan
$100 / year or $10/month
Best to get started
Includes:
- Maximum of 5 soil test upload
- SEI assessment
- SEI tracking
- Fertility plan
Pro Plan
$300 / year or $30/month
For farms who want ongoing guidance
Includes everything in Starter Plan, plus :
- Maximum of 10 soil test upload
- Season-long support (text/email)
- Fertility recommendation
Growing Farms
Custom Pricing
- Per acre options
- Multi-field planning
- Advanced fertility strategies
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 in reviewing your soil test report, or want to develop a fertility plan — reach out and we’ll get back to you promptly.
- sdgplantnutrition@gmail.com
- (405) 762-2901
- Springdale, AR 72762
Questions? Email sdgplantnutrition@gmail.com