"Types of Soil" Soil PPT Courseware 4

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"Types of Soil" Soil PPT Courseware 4

Soil types and characteristics

Sandy soil: coarser particles

Clay soil: finer particles

Loam: a mixture of coarse-grained sand and fine-grained clay

Type of soil: sandy soil, clay soil, loam

How to identify soil

Hand pinching method

Hold the soil in your hand and then open your palm. The soil will spread out. The soil that cannot form into a ball is sandy soil. The soil that can be kneaded into a ball and thrown to the ground will not fall apart. The soil that can be kneaded into a ball and thrown to the ground will not fall apart. What will spread is loam.

seepage method

If the water seepage is fast and water is not easy to accumulate, that is, the water retention performance is poor, it is a sandy soil; if the water seepage is slow and water is easy to accumulate, that is, the water retention performance is good, it is a clay soil; if the water seepage speed is intermediate and the water accumulation is in the middle, that is, the water retention performance is also intermediate, then For loam.

circle method

With a small amount of water in and on the soil, sandy soil cannot be kneaded into strips or circles; clay soil can be kneaded into strips but can be formed into circles. What will eventually crack is loam.

Precipitation

Soak the soil sample in water, and after stirring and settling, the clay and sand will naturally divide into two layers. If the sand in the lower layer is thicker than the clay in the upper layer, it is sandy soil; if the sand layer is thinner than the clay layer, it is clay soil; If the sand layer and clay layer are about the same thickness, it is loam.

Think about it

Do you have any other good identification methods? Tell us about your own identification methods and share them with your classmates.

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Update Time: 2024-07-06

This template belongs to science courseware Hunan Education Edition Third Grade Science Volume 1 industry PPT template

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