Targeting the soil quality and soil health concepts when ...
Chapter 8: Soil. Goals Understand how the soil quality determines what can grow Understand how soil...
-
Upload
geraldine-harrington -
Category
Documents
-
view
223 -
download
0
description
Transcript of Chapter 8: Soil. Goals Understand how the soil quality determines what can grow Understand how soil...
![Page 1: Chapter 8: Soil. Goals Understand how the soil quality determines what can grow Understand how soil quality can determine the survival of societies.](https://reader030.fdocuments.in/reader030/viewer/2022012914/5a4d1b0c7f8b9ab05998b83c/html5/thumbnails/1.jpg)
Chapter 8:Soil
![Page 2: Chapter 8: Soil. Goals Understand how the soil quality determines what can grow Understand how soil quality can determine the survival of societies.](https://reader030.fdocuments.in/reader030/viewer/2022012914/5a4d1b0c7f8b9ab05998b83c/html5/thumbnails/2.jpg)
Goals• Understand how the soil quality
determines what can grow • Understand how soil quality can determine
the survival of societies
![Page 3: Chapter 8: Soil. Goals Understand how the soil quality determines what can grow Understand how soil quality can determine the survival of societies.](https://reader030.fdocuments.in/reader030/viewer/2022012914/5a4d1b0c7f8b9ab05998b83c/html5/thumbnails/3.jpg)
Note: Fig. 8-4 in our book also includes the “E horizon”
![Page 4: Chapter 8: Soil. Goals Understand how the soil quality determines what can grow Understand how soil quality can determine the survival of societies.](https://reader030.fdocuments.in/reader030/viewer/2022012914/5a4d1b0c7f8b9ab05998b83c/html5/thumbnails/4.jpg)
O Horizon• Humus- dark, soft, spongy residue of
organic matter as a result of decomposition of organic matter such as leaves and dead wood
• 1 ۫ source of nutrients in soil systems
![Page 5: Chapter 8: Soil. Goals Understand how the soil quality determines what can grow Understand how soil quality can determine the survival of societies.](https://reader030.fdocuments.in/reader030/viewer/2022012914/5a4d1b0c7f8b9ab05998b83c/html5/thumbnails/5.jpg)
A Horizon
• Top soil-mixture of humus and leachial mineral soil
• Thin roots extend into this layer
![Page 6: Chapter 8: Soil. Goals Understand how the soil quality determines what can grow Understand how soil quality can determine the survival of societies.](https://reader030.fdocuments.in/reader030/viewer/2022012914/5a4d1b0c7f8b9ab05998b83c/html5/thumbnails/6.jpg)
E Horizon• Eluviation
process of leaching (note: You may see this word spelled with and I, A, or E)
• Minerals are “leached” into this layer from H2O moving downward
![Page 7: Chapter 8: Soil. Goals Understand how the soil quality determines what can grow Understand how soil quality can determine the survival of societies.](https://reader030.fdocuments.in/reader030/viewer/2022012914/5a4d1b0c7f8b9ab05998b83c/html5/thumbnails/7.jpg)
• Accumulation of elluvial organic matter
• Often high in iron, aluminum, and calcium
• Often high in clay content
![Page 8: Chapter 8: Soil. Goals Understand how the soil quality determines what can grow Understand how soil quality can determine the survival of societies.](https://reader030.fdocuments.in/reader030/viewer/2022012914/5a4d1b0c7f8b9ab05998b83c/html5/thumbnails/8.jpg)
• Unweathered parent material
• Shows little or no sign of soil formation (primary succession)
• Glacial deposits, volcanic ash
• Reveals history of the land
![Page 9: Chapter 8: Soil. Goals Understand how the soil quality determines what can grow Understand how soil quality can determine the survival of societies.](https://reader030.fdocuments.in/reader030/viewer/2022012914/5a4d1b0c7f8b9ab05998b83c/html5/thumbnails/9.jpg)
Texture
Sand 2.0-.02 mmSilt .02-.002 mmClay.002mm ≥ some microscopic
Porosity and Permeability
![Page 10: Chapter 8: Soil. Goals Understand how the soil quality determines what can grow Understand how soil quality can determine the survival of societies.](https://reader030.fdocuments.in/reader030/viewer/2022012914/5a4d1b0c7f8b9ab05998b83c/html5/thumbnails/10.jpg)
LOAM: 40%sand 40% silt 20% clay
Loam is theoretically the ideal soil
ltpwww.gsfc.nasa.gov/ globe/pvg/texture3.htm
![Page 11: Chapter 8: Soil. Goals Understand how the soil quality determines what can grow Understand how soil quality can determine the survival of societies.](https://reader030.fdocuments.in/reader030/viewer/2022012914/5a4d1b0c7f8b9ab05998b83c/html5/thumbnails/11.jpg)
Classes of SoilMollisols- very fertile, dark, found in temperate grasslands, best agricultural soil, Deep A horizonOxisols- soil of tropical and subtropical rainforest layer of iron and Al oxides in B horizon, little O horizonAlfisols- weathered forest soil, not deep, but developed OAE+B typical of most temperate forest biome. Need fertilizer for agricultureAridsols- dry lands + desert, lack of vegetation, lack of rain unstructured vertically, irrigation leads to salinization because of high evaporation.
![Page 12: Chapter 8: Soil. Goals Understand how the soil quality determines what can grow Understand how soil quality can determine the survival of societies.](https://reader030.fdocuments.in/reader030/viewer/2022012914/5a4d1b0c7f8b9ab05998b83c/html5/thumbnails/12.jpg)
The Public Policy and Soil
Low Input sustainable Agriculture (LISA)-started by US Defense of Agriculture in 1988
Conservation Reserve Program- 1985
Food Security Act of 1985
Federal Agriculture Improvement and Reform (FAIR) 1996
Environmental Quality Incentive Program (EQUIP)
Know these Acts and Laws:
![Page 13: Chapter 8: Soil. Goals Understand how the soil quality determines what can grow Understand how soil quality can determine the survival of societies.](https://reader030.fdocuments.in/reader030/viewer/2022012914/5a4d1b0c7f8b9ab05998b83c/html5/thumbnails/13.jpg)
LOAM: 40%sand 40% silt 20% clay
Loam is theoretically the ideal soil
ltpwww.gsfc.nasa.gov/ globe/pvg/texture3.htm