What is the chemical formula for phosphorus in fertilizers?

The chemical formula for phosphorus in fertilizers is represented by P2O5, which is known as diphosphorus pentoxide. This compound is commonly found in fertilizers and indicates the presence of phosphorus, an essential nutrient for plant growth. In the context of fertilizers, P2O5 signifies the phosphorus content, which plays a crucial role in energy transfer, photosynthesis, and nutrient movement within the plant.

The other options refer to different chemical compounds that do not provide phosphorus in the context of fertilizer composition. K2O stands for potassium oxide, which is a source of potassium; NH3 represents ammonia, a nitrogen compound; and CH4 is methane, a simple organic molecule that does not contain either phosphorus or play a direct role in fertilizers as a nutrient. Understanding these distinctions is important for recognizing the roles various elements play in plant nutrition and for making informed choices regarding fertilizer application.