Seeding Rate Per Hectare
Calculator
Results
- Seeding rate (kg/ha)
- 139.318885
- Seeds sown per m²
- 309.597523
Farming results
| Seeding rate (kg/ha) | 139.318885 |
| Seeds sown per m² | 309.597523 |
formula-map diagram
- Seeding rate (kg/ha)
- 139.318885
- Seeds sown per m²
- 309.597523
Formula map
Formula
Seeding rate (kg/ha) = plants/m² × TSW(g) ÷ 100 ÷ (germination × establishment)= 139.31888544892
Note
Simplified agronomic model: results use the rates, grades and coefficients you enter and ignore soil type, weather, variety and local regulations. Confirm with a soil test, the product label and an agronomist before applying anything.
More in Farming and crops
See all →Frequently asked questions
What is the difference between seeding rate and plant population?+
Seeding rate is the quantity of seed you put in the ground per hectare; plant population is the number of plants that actually emerge and survive. The gap between the two is explained by germination rate and expected field losses.
Why do I need to know the thousand-seed weight (TSW)?+
Seed size varies significantly between lots and varieties, so a rate expressed only in seeds per hectare must be converted to a weight using the TSW to know how much bagged seed to buy. Skipping this step is the most common cause of under- or over-ordering seed.
How does germination percentage affect the rate I should use?+
If germination is below 100%, you need to seed more than your target plant population to compensate. A germination test result of 90% means increasing the raw seeding rate by roughly 11% to still hit your target stand.
Should I increase the seeding rate for late planting?+
Yes, in most row and cereal crops a later planting date reduces tillering or branching time, so a higher target population partially compensates for fewer plants doing the work of yield. Check your crop's specific late-planting adjustment table rather than guessing.
Why is my recommended rate higher than my neighbor's for the same crop?+
Row spacing, soil type, expected seedbed conditions, and variety-specific vigor all shift the ideal rate, so identical crops on different farms can legitimately need different seeding rates. Match the rate to your own field conditions rather than copying another operation.