This project will extend economic studies of nonpoint source (NPS) water pollution in two directions. First, it will evaluate in alternative, more realistic, method for control of NPS pollution--taxing one, rather than all, inputs to pollution. Although regulating all inputs that affect
pollution is necessary to achieve pollution reduction at least social cost, regulating one input may be technically and administratively more feasible. This research will examine which single
input should be regulated in a second-best policy environment, and how much higher control costs are relative to more efficient approaches. Second, it will incorporate heterogeneous land conditions into this comparison to reflect the reality that farmland is far from homogeneous in response to inputs. An argronomic model which predicts yields and effluent production for specified inputs will be used to provide some empirical results in addition to the theory.