Presentation on theme: "Soil Erosion Video Eric Angat Teacher. Copy and Answer the following Questions in your notebook. 1.Where is soil erosion happening? 2.Who practice soil."— Presentation transcript:
Copy and Answer the following Questions in your notebook. 1.Where is soil erosion happening? 2.Who practice soil conservation? 3.How do farmers practice soil conservation? 4.Draw, label, and describe the soil box with three compartments. 5.Explain why the third compartment has the highest degree of soil erosion.
Fibrous roots Fibrous roots have extensive root systems that hold and binds soil firmly preventing soil erosion.
Copy and Answer the following Questions in your notebook. 6. What is the disadvantage of plowing or soil tilling? 7. What are the alternatives for soil tilling or plowing? 8. What are the benefits of no till or minimum till? 9. Why are farm residues (stem and leaves of crops) left on farm lands? 10. Why is soil erosion considered as major problem in farming?
Soil Plowing an agricultural process used for cutting, lifting, and loosening the soil. Benefits – Roots need oxygen for cell respiration and the correct amount of water to nourish the plant. Plowing nurtures the soil by providing aeration and improving drainage.
Overgrazing Too many grazing animals degrades pasture, leading to exposure of the bare soil surface and ultimately erosion and even desertification of the area followed by wind/water erosion.desertification What grass plants need is sufficient recovery time between bites.
Copy and Answer the following Questions in your notebook. 11. What do we need to do to safeguard the future of our world? 12. Who are the key to the Green Economy? Why? 13. What is agriculture? Think! 14. Why do we need more food as years go by? 15. How can we help farmers produce more food? 16. How do plants help lower air pollution and prevent soil degradation? Think!
17. Watch and Read: What erosion prevention technique was used in building the Banaue Rice terraces in the Philippines? How does this technique prevent soil erosion?
Terracing and Contour plowing Prevents or slows down erosion by slowing down run- off. Run-off is water flowing on a slope. Fast run-off=great erosion
18. Which is more likely to prevent mass-movement events? A.constructing buildings in stream drainage paths B.clear-cutting trees from the side of a mountain C.paving roads next to sloping hills D.contour plowing of crop areas
Asphalt and concrete road prevent the percolation of water to the soil. This leads to more run-off that leads to erosion and flooding. Accumulation of runoff
Cemented pathSpaced tilesGrass lawn Which of the following will permit the greatest percolation and least runoff?
19. How does the replacement of large land areas with concrete and asphalt affect the land? A.It changes the bedrock of underlying layers of soil. B.It prevents the dynamics of the rock cycle. C.It increases the amount of groundwater in porous rock. D.It increases erosion of sediments by increasing runoff.
stabilized shoreline Adding rocks, sediments, and plants.
22. From a scientific perspective, which of the following sequences of action is the best way to solve the problem of wetland erosion? A.add sediments, plantings, monitor plantings B.dredging, sand bags, plantings C.dredging, hard stabilization, plantings D.hard stabilization, sediment transport, pesticide treatment
23. Cracks in rocks widen as water in them freezes and thaws. How does this affect the surface of the Earth? A. It reduces the rates of soil formation. B. It changes the chemical composition of the rocks. C. It exposes rocks to increased rates of erosion and weathering. D. It limits the exposure of rocks to acid precipitation.
24. Which is a farming technique that could improve the soil and the environment? A. using fueled machines that will turn the soil continuously B. placing inorganic chemical fertilizers in the soil C. creating undisturbed layers of mulch in the soil D. irrigating the soil with salty water
25. List 5 ways on how to lessen soil erosion. Think! no till or minimum till Leave farm residues (stem and leaves of crops) left on farm lands or use soil mulch. Terracing and Contour plowing Planting grass, shrubs, and trees Stabilizing shorelines and protecting Riperian buffers
Establishing and Managing Riparian Forest Buffers