1. Agriculture and Water Pollution: Transfer of Material Into Freshwater from Agricultural Practices
Irrigation
Precipitation
Water Inputs
Dissolved Materials (nitrates, phosphate, salts), Pesticides, Pathogens, and Suspended Material (sediment, organics)
Soil
Surface Water
Dissolved Materials (nitrates, phosphate, salts), Pesticides and Pathogens
Ocean
Groundwater

2. Create a list of agricultural activities that can lead to the introduction of suspended and dissolved material into groundwater and surface water.

3. Agricultural Activities That Can Lead to Material Transport
Tilling
Soil compaction
Planting on slopes
Riparian zone destruction
Fertilizer application
Pesticide application

4. What are the components of NPS water pollution that are of concern?
Create a list of these components and differentiate between suspended and dissolved.
For each component, provide a definition and an example.

5. Examples of NPS Pollution
Suspended
Inorganic soil components (e.g., silt and clay)
Organic components (e.g., manure, plant detritus)
Pathogens (e.g. bacteria, protozoa)
Dissolved
Natural ions (e.g., Na+, Ca2+, Cl-, SO42+) – from chemical weathering of rocks and minerals
Fertilizer-derived ions (NH4+,NO3-,PO43-)
Pesticides
Note: some of these can be attached to the surfaces of suspended material

6. Eutrophication Nutrient Runoff (surface and groundwater)
Increased primary productivity (phytoplankton)
Dead organic material decomposed by aerobic bacteria
Decreased oxygen (hypoxia)