An old Oltgama seeder, which may still be useful to you if you have small fields or a lot of time. She has the required power of 60/30 hp. (this modification).
The Oltgama 36/18 seed drill mod has a price of FS 23 in the store; for the first 4000 money, and the second 2000 money. Each has its own container for seeds; the first has 540 liters, and the second has 270 liters.
The working speed of sowing should be about 12 km/h.