Presentation on theme: "Pesticides in land and water. About 1 billion pounds of pesticides are applied each year Agriculture now accounts for 70 to 80 percent of total pesticide."— Presentation transcript:
About 1 billion pounds of pesticides are applied each year Agriculture now accounts for 70 to 80 percent of total pesticide use. Most agricultural pesticides are herbicides, which account for about 60 percent of the agricultural use Applying pesticides has caused pollution to land and water resource. http://pubs.usgs.gov/circ/circ1225/html/sources.html
Current issues Local and regional management of pesticide use can go a long way toward improving water-quality conditions. http://www.policyalmanac.org/environment/archive/water_nonpoint_source.shtml
Why? Streams and groundwater in basins with significant agricultural or urban development almost always contain complex mixtures of nutrients and pesticides.
What are the mixtures? Chemicals in current use Chemicals in historically use.(E.x: DDT ) Chemical breakdown products
Land use relates to chemicals/nutrients applied. Types Concentrations Examples: - Fertilizers, pesticides applied in agri-cultural and urban areas. - Nutrients from animal and human wastes.
Pesticides contaminate groundwater Half of population drink groundwater. Especially those who live in the agricultural areas, about 95% population relies upon groundwater for drinking water. Pesticides can reach water-bearing aquifers below ground from applications onto crop fields, seepage of contaminated surface water, accidental spills and leaks, improper disposal, and even through injection waste material into wells.
RELATIVE LEVEL OF CONTAMINATION Urban areasAgriculturalareasUndevelopedareas NitrogenMediumMedium-HighLow PhosphorusMedium-High Low HerbicidesMediumLow-HighNo data Currently usedinsecticides Medium-HighLow-MediumNo data Historically used insecticides Medium-HighLow-highLow Streams
RELATIVE LEVEL OF CONTAMINATION Urban areasAgricultural areas NitrogenMediumHigh PhosphorusLow HerbicidesMediumMedium-High Currently used insecticidesLow-Medium Historically used insecticideLow- High Shallow Ground Water
Chemicals can take a long time to appear in groundwater
How to reduce Agrichemical pollutions? 1.Mix, apply, store, and dispose agrichemical properly.
2. Follow the instructions on the label properly.
Warnings or caution of statement Misuse Statement Re- entr y stat em ent Direction for use
Warnings or caution of statement what ways the product may be poisonous. how to avoid poisoning. If highly toxic, must inform physicians of the proper treatment for poisoning.
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