ag2 - AgricultureandSoil Lecture7 SoilErosionbyWind Signals...

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Agriculture and Soil Lecture 7
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Soil Erosion by Wind - Signals Ground surface lowers, blowouts in extreme cases Dust storms Reduction in plant growth – photosynthesis reduced by dust  coating leaves Drifting of wind deposited sediment
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Preventing Soil Loss Climatic conditions cannot be changed, but agricultural  practices can reduce risk. Mechanical: Plowing methods and field geometry Vegetative: Shelterbelts and windbreaks Political and economic leverage can also help by  manipulating subsidies and instituting incentives for  protection. Government cannot intervene directly on privately  held farmland.
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Soil Management and Legislation Food Security Act (1985 ) -- Required identification of highly erodible land -- Subsidies as “lever” -- Conservation reserve program established Over 40 million acres taken out of production USDA lease and set-aside  SCS became Natural Resources Conservation  Service(NRCS) in 1994
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Effects of a Wind Break on Wind Velocity
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ag2 - AgricultureandSoil Lecture7 SoilErosionbyWind Signals...

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