so a THIN layer of hay on top after sowing, can do it? (the plants will sprout and the hay is not thick enough to smother them completely)
Or the shredded wood chips?
Or rather, as you say. she does say pull back the hay to plant, then cover back up: http://www.motherearthnews.com/organic-gardening/ruth-stouts-system-zmaz04fmzsel
"You plant exactly as you always have, in the Earth. You pull back the mulch and put the seeds in the ground and cover them just as you would if you had never heard of mulching."