Composting is the method in which waste matter from the farms is converted into manure through microbial activity. Typically, this involves digging a pit and introducing farm refuse and water. The material is kept covered for several weeks. In time, bacteria will act upon this organic matter and increase its NPK (Nitrogen, Phosphorus, Potassium) ratio and make it usable as manure. Sometimes, worms such as earthworms can be added to the compost to speed up the process. When that is done, the process is known as vermicomposting