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Calcimator

Cover Crop Mix Calculator

Design multi-species cover crop seeding mixes by balancing grasses, legumes, and brassicas with appropriate seeding rates and cost estimates.

Inputs

%
%
%

Results

Mix Seeding Rate (lbs/acre)

26.8

Total Seed Cost

$804.00

≈ 9 nice dinners out

Total Seed Needed (lbs)536
Seed Cost Per Acre$40.20
Est. N Fixation (lbs N/acre)32
Grass Seed Needed (lbs)400
Total Legume Seed120
Total Brassica Seed16
How to Use This Calculator
  1. Enter field acreage, primary cover crop goal (nitrogen fixation, erosion control, weed suppression, etc.).
  2. Select species mix components and enter desired seeding rate contribution (%) per species.
  3. Read blended seeding rate (lb/acre) for each component and total mix rate.
  4. Verify the mix meets your organic certification plan and soil health goals.
  5. Adjust species percentages based on availability, cost, and termination timing requirements.

How the result changes with Grass Pure-Stand Rate (lbs/acre)

Grass Pure-Stand Rate (lbs/acre)Mix Seeding Rate (lbs/acre)Total Seed Cost
2912.6$378.00
7722.2$666.00
13433.6$1,008.00
18143$1,290.00

What each input means

Acres to Seed
Total acreage for cover crop planting.
Grass Component (%)
Proportion of grasses (rye, oats, ryegrass) in the mix.
Legume Component (%)
Proportion of legumes (clover, vetch, peas) for nitrogen fixation.
Brassica Component (%)
Proportion of brassicas (radish, turnip) for deep tillage and nutrient scavenging.
Grass Pure-Stand Rate (lbs/acre)
Pure-stand seeding rate for grass species (e.g., cereal rye: 90-120).
Legume Pure-Stand Rate (lbs/acre)
Pure-stand seeding rate for legume species (e.g., crimson clover: 15-25).
Brassica Pure-Stand Rate (lbs/acre)
Pure-stand seeding rate for brassica species (e.g., radish: 8-12).
Average Seed Cost ($/lb)
Blended average seed cost per pound.

What each result means

Mix Seeding Rate (lbs/acre)
Total pounds of seed mix per acre.
Total Seed Needed (lbs)
Total pounds of seed for all acres.
Total Seed Cost
Total cost for cover crop seed.
Seed Cost Per Acre
Cover crop seed cost per acre.
Est. N Fixation (lbs N/acre)
Estimated nitrogen fixed by legume component (lbs N per acre).
Grass Seed Needed (lbs)
Total pounds of grass seed component.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Acres to Seed = 20, Grass Component (%) = 40, Legume Component (%) = 40, Brassica Component (%) = 20 = 8 input(s) provided
  2. Calculate Mix Seeding Rate
    Mix Seeding Rate = grassRateInMix + legumeRateInMix + brassicaRateInMix
    26.8 = 26.8
  3. Calculate Total Seed Cost
    Total Seed Cost = totalSeed * seedCostPerLb
    804 = $804
  4. Calculate Total Seed Needed
    Total Seed Needed = totalSeedRatePerAcre * acres
    536 = 536
  5. Calculate Seed Cost Per Acre
    Seed Cost Per Acre = totalSeedRatePerAcre * seedCostPerLb
    40.2 = $40.2

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