Hauling Compost in my Glove Compartment

My first two vegetable gardens after my retirement were less than stellar successes. I am determined that next season’s garden will be different and that I will be able to significantly reduce my grocery bill by eating home produce. With that aim in mind, I have begun actively planning and working my garden plot this fall and winter. In the past I cleaned out horse stables and hauled pickup loads of horse manure and spoiled alfalfa hay to build compost piles for my garden. That was a lot of work. Reading my organic gardening books, I realized there might be a much simpler solution to building up the soil with organic material, i.e. green manure/cover crops. As a compost pile composts, it becomes much diminished in volume. Green manure/cover crops do the opposite and expand immensely in volume. Armed with this knowledge, I bought a three pound bag of rye grass seed for $3 and threw it in my car’s glove compartment. It has been a couple months since I planted the ryegrass and the garden is now covered with 6 inches of green weed-smothering grass and hidden beneath the soil surface, the ryegrass’s tremendous root system is an ever expanding organic mass, not diminishing like my compost piles. Could this actually be a lazy man’s way to garden?