where CSi is the cost for controlling soil loss from agricultural activity i (RMB ¥/kg); SLil is the soil loss amount from activity i (tonne/km2) in season l. The cost for management of solid-sate nitrogen loss can be presented by:
where CSi is the cost for controlling soil loss from agricultural activity i(RMB ¥/kg); SLil is the soil loss amount from activity i (tonne/km2) inseason l. The cost for management of solid-sate nitrogen loss can be presented by: