Covered
Covered the material to one of the covered surface soil material covered might be a plastic rice straw. The beginning of rice husk, groundnut, rice husk ash, grains, trees. Sawdust, as well as dried leaves and grass. Select what kind of materials are used, depending on the quantity. The price and performance of that is enough. Are appropriate and do not have any objective or material. Covered may be covered before planting and after planting.