Latt, What you are referring to is called Hydro-Seeding! I copied and pasted the Hydro-Seeding Process from the Web and it is explained as follows: Hydro seed machines mix together seed, water, fertilizer, tackifier (glue), and green wood fiber mulch to create a slurry. The slurry is sprayed on the ground with a high pressure hose which helps it to reach all kinds of terrain, like slopes, that may be difficult to reach. When the slurry dries, it creates a crust over the ground, protecting the area from erosion. The crust protects the seeds from being washed away in the rain or eaten by birds.
Like you, I believe that this process would work on Ginseng Beds and probably even some that are on steep terrain! You would just leave out the seeds and fertilizers, add Straw mulch and maybe add some leaf mulch to add some browns to the mixture. Companies provide Hydro-Seeding services for lawns, large construction sites and even for road construction (i.e. seeding of road banks and drainage ditch banks). For lawns, the process is not much more expensive than the traditional way of seeding, fertilizing and putting down straw on lawns. A Ginseng Grower could choose to pay to have Ginseng Beds covered with this process or purchase the equipment and apply it themselves. Either way, since there are no seeds and fertilizers involved, the costs would be reduced! Heck, a very ingenuitive Farmer/Ginseng Grower could build a Hydro-Seeding Setup himself or herself! It appears that you only need to build/assemble a mixing/pump setup with a large (probably) stainless steel tank with mixer installed but a portable hand-held mixer might work, a small 1/2 to 1 HP trash pump, connections to connect the tank and trash pump and a certain amount of hose/hoses to pump the mixture to a ready to use holding tank. (This could be either a fixed or portable setup depending upon the Farmer's/Ginseng Grower's needs!) Then assemble a holding tank, a strong (probably) 5 to 6 HP trash pump onto an appropriate sized and load rated trailer, again connections to connect the holding tank and trash pump, an array of assorted lengths of hoses for pumping the mixture onto the Ginseng Beds and an assortment of appropriate sized and shaped nozzles.
Frank