Enter your Total Seeds Tested and Germinated Seeds to calculate your Germination Rate, then add Seed Purity, Target Plant Population, and Field Size to get your Pure Live Seed (PLS), Required Seeding Rate, and Total Seed Required.
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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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.
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.
Key factors include seed age, storage conditions, moisture content, temperature, seed treatment, genetic variety, and environmental stress during seed development.
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.
Good quality seed typically has germination rates of 85% or higher. Rates below 80% may require increased seeding rates or seed replacement.
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.
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.
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.