Flame, go ahead and sow the seed. I was merely referring to how rye roots give off compounds that inhibit seed germination or establishment success from seed (not really sure which). So it is used in no till agriculture for this purpose and large seeded plants like corn, soybeans, sunflowers can be drilled in the sod. They will sprout but many weedy competitors are inhibited by compounds that the ryegrass left in the soil. I don't know if would prevent, slow, or inhibit the establishment of Bermuda grass from seed so go ahead and do it and cut the rye grass low.
