Seed Germination Rate Calculator

Germination rate tells you what percentage of seeds in a batch are actually viable — critical for knowing how much seed to plant to hit your target crop density. Enter your Total Seeds Tested, Germinated Seeds, Seed Purity, Thousand Kernel Weight, Crop Type, Target Plant Population, and Estimated Emergence Mortality into the Seed Germination Rate Calculator to get your Germination Rate and Pure Live Seed (PLS) %. Secondary outputs include your Required Seeding Rate in seeds/ft² and lbs/acre, plus Total Seed Required for your field.

Number of seeds used in germination test

Number of seeds that successfully germinated

%

Percentage of pure seed in the lot

g

Weight of 1000 seeds in grams

plants/ft²

Desired number of plants per square foot

%

Expected seedling mortality percentage

acres

Size of field to be planted (optional)

Results

Germination Rate

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Pure Live Seed (PLS)

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Required Seeding Rate

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Seeding Rate

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Total Seed Required

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Frequently Asked Questions

What is seed germination rate and why is it important?

Seed germination rate is the percentage of seeds that successfully sprout and develop into seedlings under optimal conditions. It's crucial for determining seeding rates and predicting crop establishment success.

How do you calculate pure live seed (PLS)?

Pure Live Seed is calculated by multiplying the purity percentage by the germination percentage, then dividing by 100. For example: (98% purity × 85% germination) ÷ 100 = 83.3% PLS.

What factors affect seed germination rates?

Key factors include seed age, storage conditions, moisture content, temperature, seed treatment, genetic variety, and environmental stress during seed development.

How often should I test seed germination?

Test germination annually before planting, especially for stored seed. Seeds older than one year or stored in poor conditions should always be tested before use.

What is considered a good germination rate for crop seeds?

Good quality seed typically has germination rates of 85% or higher. Rates below 80% may require increased seeding rates or seed replacement.

How does thousand kernel weight (TKW) affect seeding calculations?

TKW determines how many seeds are in a pound of seed, which is essential for converting between seeds per square foot and pounds per acre for seeding rate calculations.

What is emergence mortality and how should I estimate it?

Emergence mortality is the percentage of germinated seedlings that die before establishment. Typical rates range from 5-15% depending on soil conditions, planting depth, and weather.

How do I conduct a proper germination test?

Use 100 representative seeds, place on moist paper towels or germination medium, maintain optimal temperature and moisture for 7-14 days, then count successfully germinated seeds.