T18-1 Soil Science and Management, 4E Chapter 18 Soil Conservation

T18-2 Soil Science and Management, 4E Objectives List the effects of soil erosion Describe how soil erosion occurs List the types of water and wind erosion Calculate soil loss from water erosion on a field Describe ways to prevent erosion

T18-3 Soil Science and Management, 4E Terms to Know Cross-wing ridges Cross–wind trap strips Ephemeral gullies Filter strips Gully erosion Revised Universal Soil Loss Equation (RUSLE) Rill erosion Saltation Sheet erosion Splash erosion Surface creep Suspension Universal Soil Loss Equation (USLE) Wind Erosion Equation (WEQ)

T18-4 Soil Science and Management, 4E Erosion Cost of erosion Figure 18-1

T18-5 Soil Science and Management, 4E Erosion Figure 18-2

T18-6 Soil Science and Management, 4E How Water Erosion Occurs Texture and structure Slope Figure 18-6

T18-7 Soil Science and Management, 4E Surface roughness Soil cover Types of water erosion How Water Erosion Occurs

T18-8 Soil Science and Management, 4E Predicting Soil Loss: The Universal Soil Loss Equation Tolerable soil loss

T18-9 Soil Science and Management, 4E Figure The Universal Soil Loss Equation

T18-10 Soil Science and Management, 4E The Universal Soil Loss Equation Figure 18-13

T18-11 Soil Science and Management, 4E The Universal Soil Loss Equation Figure 18-14

T18-12 Soil Science and Management, 4E The Universal Soil Loss Equation Figure Figure 18-16

T18-13 Soil Science and Management, 4E The Universal Soil Loss Equation Sample solution Applications of the USLE The Revised Universal Soil Loss Equation

T18-14 Soil Science and Management, 4E Controlling Water Erosion Conservation tillage Figure 18-17

T18-15 Soil Science and Management, 4E Controlling Water Erosion Soil cover Figure 18-18

T18-16 Soil Science and Management, 4E Controlling Water Erosion Crop rotation Figure 18-19

T18-17 Soil Science and Management, 4E Controlling Water Erosion Grassed waterway Contour tillage (See Figure 18-21) Figure 18-21

T18-18 Soil Science and Management, 4E Controlling Water Erosion Strip-cropping Improving organic matter

T18-19 Soil Science and Management, 4E Controlling Water Erosion Terraces (See Figure 18-24) Filter strips Diversions Figure 18-24

T18-20 Soil Science and Management, 4E Wind Erosion Figure 18-25

T18-21 Soil Science and Management, 4E Wind Erosion Cause of wind erosion Figure 18-26

T18-22 Soil Science and Management, 4E Wind Erosion Effects of wind erosion Factors in wind erosion Preventing wind erosion Critical periods

T18-23 Soil Science and Management, 4E Summary Three fifths of soil lost to erosion washes away in running water Water/wind erosion: –Strips topsoil –Reduces yields –Deposits sediments Two thirds of soil erosion from wind Ways to control erosion: –Grow vigorous crops –Maintain organic matter –Avoiding overtillage and compaction –Crop rotation –Contour tillage, strip cropping, and terraces