Irrigation Precipitation Water Inputs

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Presentation transcript:

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

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

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

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.

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

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