To let the seed sprout and get started. I’m figuring that with a thick enough standing crop in the field….the heavy overstory likely keeps the soil surface pretty shaded and moist. I suppose if the overstory of vegetation was thick enough then it might create greenhouse like conditions underneath. I would bet it works....
I like the idea because seeds like clover actually do much better without being covered by a thick blanket of hay. I’m betting cereal grains would sprout just fine that way once you get your soil surface conditioned. Instead of creating a thatch layer like we’re doing now, then we would more less just be coming back two weeks after broadcasting to remove a portion of the overstory…..clip it really high so that a portion is left standing and a portion lightly covers the ground. You may just be able to let it go and not do anything if you spray at the same time you broadcast. We need to experiment with it a little.