When you look at a fertilizer pack and see a set of three numbers such as 13-13-13, this indicates that it's a balanced fertilizer that contains 13% nitrogen, 13% phosphorus, and 13% potassium.

In 2022, the residual discharge of nitrogen (13 million kilogrammes) in treated waste water was nearly 10 percent lower than in 2021. For phosphorus, residual discharges were down by over 4 percent to ...