US Patent 7335406 Surfaces for supporting artificial playing surfaces

Surfaces and methods for producing surfaces that may support an artificial playing surface are disclosed herein. An example of a surface according to the invention includes a first layer with soil and a plurality of fibers, and a second layer with soil and an organic binder. At least a portion of the second layer is above the first layer. Both layers should be water permeable to some degree. The organic binder may include material from plants of one or more of the plantago family (such as dried and ground plantago husk) and/or guar family.