Seed rate often depends on germination percentage and percent filled grains in a seed lot. However, a seed bed of 300-500 m^{2} area requires 20-40 kg seeds with 80% germination for enough seedlings required by one hectare of main field.

If the seed rate is 40 kg/ha (for example), and the germination of the seed lot is 80%, the actual quantity of seed to be used for sowing one ha of land can be calculated by using the following formula:

*To ensure percentage of filled grain, select a random 100 seeds from a seed lot to be sown and count the number of filled grains, if 90, it means 90% filled grains.