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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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