ORIGINAL: RonM
You threw me with the heading , because overseeding has it's own definition, you are referring to excessive seeding and it will not hurt to apply excessive seed . I have probably seeded a thousand lawns and the heavier the better,All the seed will not germinateso I would double the required amount, probably not necessary to do any more than that,that should fill in the bare spots and give good coverage.
I too was thrown off by the term 'overseeding'.
My own personal experience is you can easily put out too much corn or soybean seed; stay with the recommeded planting rates.
Also with rape I found out that too much is not a good thing. It was little seed so I broadcast a bunch of it.
It never came up very well, except on the edges where not much got planted. There the rape came up like a
bush (I'm talking belly high and you couldn't put your arms around it. Next year I will go much lighter.
Now with cereal grains I've yet to put out too much. Oats, rye and winter wheat that I plant in October get very heavy browsing by my deer. I'm sure it might be too much as a crop that a farmer would raise for money but for a deer food plot; the more the better is my experience.