It is true that nitrogen tends to leech out in sandier soil but i would get the land soil tested. On our worst quarter of land here we have grown some dang beautiful rye crops with very little fertilizer. Our soil test this year on all the land called for very little N, we had a drought year last year so the plants did not utalize all the N. We did not need to apply anhydrous ammonia this year, just put on some dry N through the drill. In lighter land i would suggest harrow packing the soil, it will draw the moisture up and then seal it off, really seems to work for us.