Question

which soil has the largest air space

Ans Sandy soil
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Answer 1

Answer:

Sandy soil is a loose soil, made up of larger particles creating more air spaces and thus has very little moisture-retentive abilities. Not only is water unavailable but neither are nutrients that have to be in a liquid form for the roots to take them up. Silt soils have less air space and clay soils offer the least.

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Answer 2

IMPORTANCE OF SOIL : 1. Soil holds the roots of the plant

2. Soil supply water and minerals

3. Soil essential for agriculture

4. Soil is the dwelling place for many organism

Components of soil : Soil contains different types of particles which differ in size.

Gravel ( largest), sand , Clay ( finest)

Humus: the dead decaying organic matter in soil is called humus.

Soil also contains air and water.

Weathering The soil is formed by the breaking down of rocks by the action of wind,

water and climate. This process is called weathering.

The nature of soil : The nature of any soil depends upon

1. the rocks from which it has been formed and

2. the type of vegetation that grows in it.

SOIL PROFILE: A vertical section through different layers of the soil is called the soil

profile.

Each layer differs in feel (texture), colour, depth and chemical composition.

These layers are referred to as horizons.

A Horizon: The uppermost horizon is dark in colour because it is rich in humus and

minerals. The humus makes soil fertile and provides nutrients to growing plants. This

layer is generally soft, porous and can retain more water. It is called the topsoil or the A-

horizon. This provides shelter for many living organisms such as worms, rodents,

moles and beetles. The roots of small plants are embedded entirely in the topsoil.

B- Horizon: The next layer has a lesser amount of humus but more of minerals. This

layer is generally harder and more compact and is called the B-horizon or the middle

layer.

C Horizon: The third layer is the C-horizon, which is made up of small lumps of

rocks with cracks and crevices. Below this layer is the bedrock, which is hard

and difficult to dig with a spade.

TYPES OF SOIL

The soil is classified on the basis of the proportion of particles of various sizes

The soil can be classified as sandy, clayey and loamy.

SANDY SOIL :If soil contains greater proportion of big particles it is called sandy soil.

Sand particles are quite large. They cannot fit closely together, so there are large

spaces between them. These spaces are filled with air. We say that the sand is well

aerated. Water can drain quickly through the spaces between the sand particles. So,

sandy soils tend to be light, well aerated and rather dry.

CLAYEY SOIL :If the proportion of fine particles is relatively higher, then it is called clayey soil.

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