Soil Health Improvement Timeline Calculator

Project soil organic matter gains and health improvements over time based on management practices adopted.

Inputs

Current soil organic matter (%)

Cover crops adopted

No-till / reduced tillage

Compost application

Diverse crop rotation

Projection period (years)

Tab to move between fields

Results

Projected SOM (%)

3.47%

SOM increase (%)0.97%

Years to +0.5% SOM5

Years to +1.0% SOM10

Water-holding gain (gal/ac)19,427

Carbon sequestered (ton C/ac/yr)1.1

Agg Stability Years2

Infiltration Improvement2.5%

Infiltration Years3%

Microbial Response Years1

How to Use This Calculator

Enter your current soil organic matter percentage from a recent soil test.
Set your target organic matter percentage and the management practice to be implemented.
Input your soil texture and average annual rainfall.
Review the Estimated Years to Target and the Annual Organic Matter Increase rate.
Use the Sequestration Rate output to quantify carbon storage potential for reporting purposes.

How the result changes with Current soil organic matter (%)

Current soil organic matter (%)	Projected SOM (%)
1.65	2.62%
4.52	5.46%
7.98	8%
11	12.33%

What each input means

Current soil organic matter (%): Current SOM from soil test (typical cropland: 1.5-4%).
Cover crops adopted: 0 = No, 1 = Yes. Annual cover cropping adds biomass carbon.
No-till / reduced tillage: 0 = No, 1 = Yes. Reduces SOM oxidation and improves aggregation.
Compost application: 0 = No, 1 = Yes. Regular compost adds stable organic matter.
Diverse crop rotation: 0 = No, 1 = Yes. 3+ crops in rotation feeds diverse soil biology.
Projection period (years): Number of years to project improvements.

What each result means

Projected SOM (%): Estimated soil organic matter percentage after the projection period.
SOM increase (%): Total gain in soil organic matter percentage points.
Years to +0.5% SOM: Estimated years to gain half a percentage point of organic matter.
Years to +1.0% SOM: Estimated years to gain a full percentage point of organic matter.
Water-holding gain (gal/ac): Additional water-holding capacity from SOM increase (~20,000 gal/ac per 1% SOM).
Carbon sequestered (ton C/ac/yr): Estimated annual carbon sequestration rate.

How this is calculated

Worked example, using the default values

Identify Input Parameters
4 parameters
Current soil organic matter (%) = 2.5, Cover crops adopted = 1, No-till / reduced tillage = 1, Compost application = 0 = 6 input(s) provided
Calculate Projected SOM
3.47 = 3.47%
Calculate SOM increase
SOM increase = projectedSOM - currentSOM
0.97 = 0.97%
Calculate Years to +0.5% SOM
Years to +0.5% SOM
5 = 5

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