Pete, many thanks for sharing all this, I am sure it will help lots of gardeners and I changed the name of this thread to reflect all the goodies here. Experience based, it all works.
What you refer to as grazing rye is rye cereal for grain? It is a confusing word because I know some have sown ryegrass mistakenly and then had a job to be rid of it.
Alfalfa – do you never see any nodules on it?