Field trials with different seeding dates of faba bean cv. Nadwislanski were run on 5 experiment stations over the years 1975-1979. Faba bean was seeded as soon as the soil got sufficiently dry in the spring (1st date), 15 days afterwards (2nd date), and 30 days afterwards (3rd date). Delayed seeding was found to shorten the period from seeding to emergence and from emergence to flowering. The lengths of periods from flowering to 5-10% brown pods and from flowering to 70-80% brown pods were not influenced by timing of seeding. Delayed seeding decreased the number of seeds per plant and the number of seeds per unit area. Even though 1000-seed weight was unchanged the yield of seeds declined with later seeding dates. The decline was 0.8% per each day of seeding delay and, in the trials in question, it corresponded to 35 kg seed/ha. Straw yields per hectare tended to incrase as a result of late seeding. The increase involved a change in the seed to straw ratio. The ratio was 1 to 1.63 for faba seeded on the 1st date and 1 to 2.28 on the 3rd date. Later seedlings had no appreciable effect on the chemical composition of faba bean seeds, but they affected the chemical makeup of staw: fat and ash contents were increased and fibre content was reduced.