Abstract
The primary seed in an oat (Avena sativa) spikelet is larger than the secondary seed. Genotypes varying in primary:secondary seed weight ratios were grown in three seasons at two seeding rates to determine if there were grain yield differences between plots seeded with the two different seed types. Grain yield advantages of 8–15% were found for plots seeded with primary seeds. Plants grown from primary seeds were found to have faster seedling growth rates and shorter periods from seeding to heading and maturity. The effects of seed type on plant height, number of panicles per plant, number of seeds per panicle and 1000-grain weight were variable. Yield difference was most strongly associated with the length of the seeding-to-heading period. No relationship was found between the primary:secondary seed weight ratio of a particular genotype and the yield difference between plots seeded with primary versus secondary seeds.Key words: Oat, Avena sativa L., primary:secondary seed weight ratio, grain yield
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