This total cost for pollution control is divided into three parts: control of soil loss, management of solid-state N and P, and control of dissolved N and P. In this model, management of solid-state N and P is additionally required by the local government. This aims to prevent them entering the surrounding water environment through technically enhancing N and P utilization efficiency and cutting off the linkage between N and P sources and their potential migration paths. In specific, the total revenue from the three agricultural activities can be expressed as: