Nitrogen is a key element in all organisms. Use the following assumptions to set up a matrix model of nitrogen flow in an ecosystem consisting of producers (P), consumers (C) and decomposers (D). – 25% of the nitrogen in plants goes to consumers and 50% goes to decomposers. – 75% of the nitrogen in consumers goes to decomposers. – 5% of the nitrogen in decomposers goes to consumers, and 15% is lost from the ecosystem. The rest goes to plants.