different types of soil soil is made of four parts: 1) sand 2) silt 3)clay 4)humus
TRANSCRIPT
![Page 1: Different types of soil Soil is made of four parts: 1) Sand 2) Silt 3)Clay 4)Humus](https://reader034.vdocuments.net/reader034/viewer/2022042821/56649dc05503460f94ab4d68/html5/thumbnails/1.jpg)
THE CHANGING LANDSCAPE
![Page 2: Different types of soil Soil is made of four parts: 1) Sand 2) Silt 3)Clay 4)Humus](https://reader034.vdocuments.net/reader034/viewer/2022042821/56649dc05503460f94ab4d68/html5/thumbnails/2.jpg)
THE CHANGING LANDSCAPE
Different types of soil
Soil is made of four parts: 1) Sand 2) Silt 3)Clay 4)Humus
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THE CHANGING LANDSCAPE
Sand, Silt and Clay are inorganic.
Sand is the largest particle in the soil. When you rub it, it feels rough. This is because it has sharp edges.
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THE CHANGING LANDSCAPE
Sand doesn’t hold many nutrients. Sand is good for drainage.
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THE CHANGING LANDSCAPE
Silt is a soil particle whose size is between sand and clay.
Silt feels smooth and powdery. When wet it feels smooth but not sticky.
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THE CHANGING LANDSCAPE
Clay is the smallest of the particles. Clay is smooth when dry and stick when wet.
Soils high in clay content are called heavy soils.
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THE CHANGING LANDSCAPE
Here is some red clay when its wet.
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THE CHANGING LANDSCAPE
Here is some clay we use to make pots.
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THE CHANGING LANDSCAPE
Clay can also hold lots of nutrients, but doesn’t let air and water through it well.
Nutrients are food for living things.
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THE CHANGING LANDSCAPE
What is this?
Clay
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THE CHANGING LANDSCAPE
What is this?
Silt
![Page 12: Different types of soil Soil is made of four parts: 1) Sand 2) Silt 3)Clay 4)Humus](https://reader034.vdocuments.net/reader034/viewer/2022042821/56649dc05503460f94ab4d68/html5/thumbnails/12.jpg)
THE CHANGING LANDSCAPE
What is this?
Sand
![Page 13: Different types of soil Soil is made of four parts: 1) Sand 2) Silt 3)Clay 4)Humus](https://reader034.vdocuments.net/reader034/viewer/2022042821/56649dc05503460f94ab4d68/html5/thumbnails/13.jpg)
THE CHANGING LANDSCAPE
If a particle of sand was the size of a basketball
Sand
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THE CHANGING LANDSCAPE
Then silt would be the size of a baseball.
Silt
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THE CHANGING LANDSCAPE
And clay would be the size of a golf ball.
Clay
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THE CHANGING LANDSCAPE
Which is the biggest?
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THE CHANGING LANDSCAPE
So which is the biggest?
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THE CHANGING LANDSCAPE
Humus is organic matter. Organic means natural and made from living things.
It is made of decayed or dead plants and animals. Humus contains the most nutrients.
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THE CHANGING LANDSCAPE
Soil is classified by the amount of sand, silt, clay, and humus it contains.
This is sandy soil.
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THE CHANGING LANDSCAPE
Sandy soil has the largest pieces. It also has a lot of air spaces between the pieces.
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THE CHANGING LANDSCAPE
Sandy soils have good drainages but they do not hold water and nutrients well.
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THE CHANGING LANDSCAPE
This is clay soil.
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THE CHANGING LANDSCAPE
Clay soil is heavy. It has few spaces between the pieces so drainage is not good. It holds nutrients well but doesn’t allow water and air to pass through.
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THE CHANGING LANDSCAPE
This is Loam soil.
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THE CHANGING LANDSCAPE
Loam soil has a lot of organic matter. It has a good mixture of sand, silt, clay and humus. It has good drainage and plenty of nutrients.
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THE CHANGING LANDSCAPE
So which soil is the best for growing plants?
A. Sandy Soil B. Clay Soil C. Loam Soil
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THE CHANGING LANDSCAPE
Plants need air, water, and nutrients from soil. Loam has all of these things so it is the best for growing plants.
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THE CHANGING LANDSCAPE Some plants use humus for
nutrients. Small animals eat the plants and bigger animals eat the small animals.
Humus is an important part of the food chain.
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THE CHANGING LANDSCAPE Homework: complete the
handout with a partner. Fill in the blanks using page 27, 28 and 29