Soil Texture


Soil Texture


The texture of a soil can be perceived through touch, by the sensation you have when rubbing a little soil between your fingers. The sand causes a feeling of roughness (like beach sand), silty silt (like talcum powder) and clay of plasticity and stickiness.

 Soils are different in their properties and characteristics. For example: clay soils are extremely hard when dry and very sticky and plastic when wet. These soils, which contain a lot of clay, have greater water and nutrient retention capacity than sandy soils. The clay particles are characterized by their extremely small size, large external area per unit weight and the presence of charges on their surface, which is why they attract ions (nutrients) and water. The sandy soils, on the other hand, do not present relevant characteristics of hardness, plasticity and stickiness and dry faster than the clayey ones.

Objectives


 Demonstrate to students the different particles that make up the soil through the use of tokens.

Materials

 - Paper card

 - Sand

 - Silte

 - Clay

 - Glue

Set up


 Cut the cardboard into equal sizes; divide it into 3 parts; in each of them pass the glue and “sprinkle” the different types of particles, from the largest to the smallest, that is, sand, silt and clay.

Goals

The experience is based on the sense of sight and touch, encouraging students to get to know the soil better, allowing them to make the cards themselves.

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