halil
Uploaded by
15 SLIDES
328 VUES
170LIKES

Understanding Soils: Their Importance, Evaluation, and Erosion Effects

DESCRIPTION

This presentation discusses the essential role of soils in providing fundamental life needs such as food and shelter. It focuses on key concepts in land evaluation: soil texture, depth, slope, and erosion. Knowing soil texture helps determine properties affecting plant growth, while depth indicates the viability of root zones. The slope impacts agricultural suitability, and understanding erosion is crucial for conservation. Techniques for measuring these factors are outlined for effective land management, preventing soil loss, and maintaining soil health.

1 / 15

Télécharger la présentation

Understanding Soils: Their Importance, Evaluation, and Erosion Effects

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Introduction To Soils Original Power Point Created by Darrin Holle Modified by Georgia Agricultural Education Curriculum Office June 2002

  2. Soil and It’s Importance • Provides basic life needs • Food and Shelter • Very limited resource

  3. Main Ideas in Land Evaluation • 1. Texture • 2. Depth • 3. Slope • 4. Erosion

  4. 1. Texture • Affects almost all properties of the soil • The amount of sand, silt and clay in a soil • Sand=largest, then silt, then clay • Determine by ribboning the soil

  5. 1. Texture • Sand is looser and gritty • Silt feels floury • Clay is sticky

  6. 1. How to determine Texture • COURSE=NO BALL • MODERATLY COURSE= 1” and gritty • MEDIUM = 1” and smooth • MODERATELY FINE = 1-2” • FINE = 2”

  7. Depth • Total thickness of material available for plant growth • Plants obtain water, nutrients and support from the root zone • Total Depth is determined from the point where the roots stop

  8. Depth • DEEP=40” • MODERATLEY DEEP = 20-40” • SHALLOW = 10-20” • VERY SHALLOW = -10”

  9. Slope • Slope refers to the steepness of the land surface • Affects soil use and management • As slope increases agriculture suitability decreases

  10. How to measure Slope • Measured in percent • Rise or fall over 100 feet

  11. How to measure Slope • NEARLY LEVEL = 0-1% • GENTLY SLOPING = 1-3% • MODERATELY SLOPING = 3-5% • STRONGLY SLOPING = 5-8% • STEEP = 8-15% • VERY STEEP = +15%

  12. Erosion • Causes loss of soil by water and wind • If one knows history of land can then do something to prevent more losses

  13. Erosion Calculation • One will be given original topsoil • To find current topsoil drag knife through top layer until it stops. This is the topsoil

  14. Erosion Calculation • Divide the current topsoil by the original to give you what percent is left • Then subtract that from 100% and that gives you amount of erosion.

  15. Erosion Levels • NONE TO SLIGHT = 0-25% • MODERATE = 25-75% • SEVERE = 75%+ with crossable gullies • VERY SEVERE = 75%+ with uncrossable gullies

More Related