Phosphorus is a chemical element. It is part of the backbone of DNA and thus contained in all animals and plants. It is one of the three primary macronutrients for plants. For agriculture, phosphorus is essential and it is, together with Nitrogen and Potassium, one of the three main constituents of fertilising products. Phosphorus for fertiliser production is mined from phosphorus rock. The main reserves of phosphorus rock lie in Morocco, West Africa and China. Scientists predict that in about 60 to 130 years peak phosphorus is achieved (in analogy to the peak oil).