Seed Rate Calculator
Calculate the seeding rate and total seed requirement based on target plant density, germination, and seed purity.
How to Use the Seed Rate Calculator
- Enter the target plant density (plants/m²).
- Enter the thousand seed weight (g).
- Enter germination (%) and seed purity (%).
- Enter the area (ha) and click Calculate.
Use Cases
- •Calculating seeding rates for grain crops.
- •Planning seed purchases for the planting season.
- •Optimizing plant density for maximum yield.
- •Calculating rates for trial plots and research.
Formula
Rate (kg/ha) = (target density × thousand seed weight) / (germination% × purity% × 1000). Total = rate × area.
Frequently Asked Questions
What is thousand seed weight (TSW)?
TSW is the weight of 1,000 seeds in grams. It is listed on seed packaging or determined by weighing.
How do I determine seed germination rate?
Germination is stated on the seed label. For old or stored seeds, perform a germination test.
Why does seed purity matter?
Purity accounts for the proportion of inert matter and other seeds in the lot, which reduces the effective seeding rate.