How can you tell black cotton soil?

The black cotton soil by observation looks dark in color and by sample test it is characterized by the phenomenon of swelling when wet and shrinks when dry. These changes describe the nature of black cotton soil obtained in Adamawa State.

How do you identify black soil?

Important features of black soil: Mature soil. High water retaining capacity. Swells and will become sticky when wet and shrink when dried. Self-ploughing is a characteristic of the black soil as it develops wide cracks when dried.

What are the typical characteristics of black cotton soil list and discuss in detail?

The main index properties used for identification and classification of black cotton soil are clay fraction (minus 2 micron), Atterberg limits, free swell, and shrinkage limits. Accordingly, the black cotton soil is potentially active and requires countermeasures.

Which type of soil is black cotton soil?

clay soil
Black cotton soil is heavy clay soil, varying from clay to loam; it is generally light to dark grey in colour. Cotton grows in this kind of soil. The soil prevails generally in central and southern parts of India.

What is the active zone in black cotton soil?

The zone up to which the soil gets affected for swelling and drying is called active zone. Water table in the areas of black cotton soils is deep hence it is the rain water and storm water which is to be prevented from coming into contact with black cotton soil of the active zone.

What is black soil also known as Class 10?

The black soil is also known as Regur soil. Black soil is ideal for growing cotton.

What are the characteristics of black soil regur soil?

Following are the characteristics of black soil: The black soil is made up of extremely fine clayey material and is well-known for water holding capacity. They develop deep cracks during hot weather which helps in the proper aeration of the soil. These soils are sticky when wet and difficult to work on.

What is black soil and its characteristics?

The following are five important characteristics of Black soil: It is fine textured and clayey in nature. It has high amounts of lime, iron, magnesium and generally low quantities of phosphorus, nitrogen and organic matter. It is black in colour since it is formed from weathered lava rocks.

What are the composition of black cotton soil?

Black cotton soil is the clay-rich soil i.e. it contains calcium, carbonate, potash, and hold moisture and is mainly formed in the tropics and subtropics region. Black cotton soil is also rich in lime, iron, magnesium but contains a low amount of phosphorous, nitrogen, and organic matter.

What is the other name of black cotton soil?

regur soil
Black soil is also known as black cotton soil or the regur soil. Black cotton soil is known as ‘tropical chernozems’ in the other parts of the world. These soils are named as black cotton soil as it is famous for the purpose of cultivation of cotton.

What is the CBR value of black cotton soil?

Due to its peculiar characteristics, it forms a very poor foundation material for road construction. Soaked laboratory CBR values of Black Cotton soils are generally found in the range of 2 to 4\%.

How do you know if soil is collapsible?

Collapsible soils are generally associated with an open structure formed by sharp grains, low initial density, low natural water content, low plasticity, relatively high stiffness and strength in the dry state, and often by particle size in the silt to fine sand range (Mitchell and Soga 2005).