Soil Textural Triangle Eric Angat Teacher Essential Question

Soil Textural Triangle Eric Angat Teacher

Essential Question How do I classify the types of soil using the soil textural triangle?

What is a soil textural triangle? A soil texture triangle is used to classify the texture of soil. The sides of the soil texture triangle are scaled for the percentages of sand, silt, and clay.

Soil Texture Triangle SILT CLAY SAND

1. Fill in the blanks. A soil texture triangle is used classify to ____the texture of soil. The sides of the triangle are scaled for the sand percentages _____of______, silt clay _______, and _____.

Which type of soil has the biggest, and the smallest soil particle? Sand feels gritty. Silt feels smooth. Clays feel sticky http: //water. me. vccs. edu/concepts/velocitysusp. htm

Copy and answer the following questions in your notebook. A video on soil texture will be shown on the next slide to help you answer the questions. . 2. What are the components of soil? 3. What is soil texture? 4. What is soil porosity? 5. What is soil permeability? 6. Which has higher permeability sand or clay? 7. What is loam? 8. How can you determine soil texture?

Soil Texture Video http: //www. youtube. com/watch? v=knrm. Cbct. GEA

2. What are the components of soil? Organic matter, water, oxygen, and inorganic rock material 3. What is soil texture? Measure of volume proportion of sand, silt , and clay. 4. What is soil porosity? are the open spaces, or voids, within the soil profile. 5. What is soil permeability? The rate at which water passes through the soil. 6. Which has higher permeability sand or clay? Sand has higher permeability than clay. 7. What is loam? Loam is the type of soil best for growing plants.

Soil Porosity

Clay–type soils have very small mineral particles and very small pores. Sandy soils have larger mineral particles and thus larger pore spaces. Although it may seem counter– intuitive, smaller pore spaces in clay soil actually add up to a larger total amount of space than in an equivalent volume of sandy soil.

The ability of water to flow through a soil is referred to as the soil's permeability. http: //techalive. mtu. edu/meec/module 06/Permeability. htm

Performing Soil Texture Analysis

8. How can you determine soil texture? Put the soil sample in a graduated cylinder and add water almost to the top. Cover the top of the cylinder with a plastic wrap, secure it with a rubber bond and shake vigorously. Then, let the cylinder sit overnight. The soil grain settles based on their size ( heavy at the bottom ). Determine the soil volume proportion and use soil textural triangle to determine the type of soil.

What kind of soil is this sample? Clay 10 m. L. Silt 25 m. L. Sand 72 m. L. http: //www. sciencephoto. com/media/169135/enlarge 107 m. L. total volume of soil 100 m. L. 75 m. L. 50 m. L.

Soil Component Volume of Soil Type Sand 72 107 X 100 67% Silt 25 107 X 100 Clay 10 107 X 100 23% 9% Total 107 Total Volume Percentage(%) 100% Formula: Percentage=(Volume of Soil Type/ Total Volume) X 100

A soil with 9 % clay, 67 % sand, and 23 % silt Sandy loam is called a ________ .

9. What kind of soil is made of 70% sand, 20% silt, and 10% clay Where do they intersect? sandy loam

10. What type of soil is made of 10% sand, 80 % clay, and 10% silt? Where do they intersect? clay

11. What type of soil is made of 40% sand, 20% silt, and 40% clay? Where do they intersect? clay

12. What kind of soil is made of 70% sand, 20% silt, and 10% clay? Where do they intersect? Sandy loam

A soil with 30% clay, 50% sand, and 20% silt sandy clay loam is called a ________ . SILT CLAY SAND