In soil science, a soil type is a taxonomic unit. Soil types are formed by all soils that have a specific set of well-defined properties. Soil type is a technical term of soil classification, the discipline that deals with the systematic categorization of soils. Soil is a component of the earth's surface that consists of decomposed rock, humus, inorganic and organic components. It takes an average of 500 years or more for soil to develop from rocks. Soil is often generated when rocks are broken down into their essential pieces. This article will explain to you about Types of soil which will be helpful in preparing the Agriculture Syllabus for the UPSC Civil Service exam.

Types of Soil

Following are some types of soil:

• Sandy soil
• Silty soil
• Clay soil
• Peaty soil
• Saline soil
• Loam soil
• Acidic soil
• Sodic soil

Sandy Soil

• Sandy soil, the most prevalent type of soil, has the largest particles.
• When touched, it feels gritty and dry due to the large voids between the particles, and it will not be able to contain water.
• Water drains quickly and directly to regions where roots, particularly seedlings, cannot reach.
• Plants have little chance of successfully using the nutrients contained in this soil since they are washed away by runoff.
• Sandy soils, which are common in desert environments, warm fast in sunshine and hold less moisture and nutrients than other soil types.
• The soil type is tested by moistening the soil and rolling it into a ball to determine the predominant soil particle.
• When wet sandy soil is rolled between our hands, there should be no ball formation and it should crumble readily through our fingers.
• Sandy soil is composed of small particles weathered from rocks. It's also low in nutrients and water retention, making it one of the poorest types of farming soil.
• This sort of soil is frequently washed away after heavy storms.
• It contains less nutrients for the plants since it heats up faster.

Sandy Soil

*For detailed notes of this topic, check this link Sandy soils

Silty Soil

• When opposed to sandy soil, silty soil is smaller in size, smoother, and becomes soapy slick when moistened.
• When we roll silty soil between our fingers, it deposits dirt on our skin. Silt, as opposed to sand, has smaller particles.
• It also includes rock and mineral pieces. Because of its fine texture, it also retains water better than sand.
• Because of the aforementioned qualities, it is also beneficial to agriculture.
• This soil, while nutritious, cannot contain as many nutrients but may keep water for a longer length of time.
• It is cool in nature due to its moisture-retention ability, and it also compacts quickly.
• If the drainage system is properly channelized, the plants benefit significantly.
• This soil is less difficult to cultivate than others.
• It has a foamy, smooth feel and is good at retaining moisture.
• Suitable for almost every form of fruit and vegetable, crop may thrive on this soil if the drainage is adequate.
• Grass, perennials, climbers, shrubs, and other plants thrive in this soil.

Silty Soil

Clay Soil

• When compared to the other soils listed, clay soil has the lowest particle composition and good water storage characteristics.
• Because of the microscopic size of its particles and their inclination to clump together, only a small amount of air can move through its gaps.
• Because of its slower drainage nature, plant nutrients will be firmly kept, making this soil rich in plant food for improved development.
• The tiniest particles are found in clay. Because the particles are so densely packed, there is very little or no airspace.
• As a result, this property efficiently retains water. However, moisture and air permeation become problematic, restricting plant development.
• This soil is chilly in the spring, and it will take time to warm up since the water within the soil must also warm up.
• When the soil dries up, it becomes quite heavy to work with. During the heat, it may also become hard and compact.
• When wet, it feels sticky, rolls up easily, and turns into a sausage-like shape.
• It is more difficult to cultivate and takes longer to warm up in the spring.
• This soil has a low water-drainage capacity and fewer air spaces.
• This soil is hard and rocky while dry, yet sticky and bumpy when wet.
• This soil is excellent for growing decorative plants and fruit trees.

Clay Soil

Peaty Soil

• The peaty soil will be either black or dark brown in hue.
• It compresses quickly due to its high water content and feels soft when handled; it is also high in organic materials.
• These soil farmers utilise it to prevent disease by regulating pH levels or soil chemistry, and it also includes acidic water.
• When we roll peat soil in our palms, no balls form, and when we crush it, the water content is driven out.
• When touched, this dirt will feel spongy. When properly drained and treated, peaty soil may yield good rice crops.
• Because the acidic state of the soil delays the breakdown process, fewer nutrients are provided.
• This soil warms very rapidly and contains a lot of water.
• This soil is appropriate for plants that include legumes, salad crops, root crops, and shrubs such as Witch hazel, Lantern trees, Heather, and others.

Peaty Soil

Saline Soil

• Because of its high salt concentration, this soil is generally brackish under exceptionally dry circumstances.
• Saline soil can harm and even halt plant development, make watering difficult, and delay germination.
• Because of the high salt concentration, the plants are unable to absorb water, resulting in drought stress.
• Saline soil is easily identified because it forms a white layer on the soil's top and plants develop poorly, suffering from leaf tip burn, which is notably visible in young leaves.
• This soil is stonier and grainier than others.
• This soil is usually found on limestone or chalk bedrock.
• In rare situations, the alkaline content of this soil may produce yellowing leaves and limited plant development.
• It is suitable for: Pinks, Lilacs, Mock Oranges, Weigela, Madonna Lillie, Cabbage, sweet corn, spinach, beets, and other vegetables.

Saline Soil

*For detailed notes of this topic, check this link Saline soils

Loam Soil

• Loam soil is regarded to be the perfect form of soil since the plants and gardeners really adore it.
• This soil has a balance of three materials: silt, clay & humus, and sand.
• It will have greater calcium and pH levels due to its past organic matter concentration.
• This dirt is black in colour, dry, and crumbles when touched. The air travels easily down to the roots between the soil particles.
• It has the proper quantities of each type of soil and humus, both of which are necessary for growth.
• Loam soils are ideal for plant growth because sand, silt, and clay mix to provide advantageous qualities.
• This soil is simple to cultivate and heats fast without getting too dry in the summer. This dirt is ideal for growing plants outside.
• This soil is suitable for practically all fruit and vegetable crops.
• Bamboos, climbers, perennials, tubers, and shrubs such as Dog's tooth violets, Wisteria, Rubus, and others flourish in this soil.

Loam Soil

Acid Soils

• If the pH number is less than 7, the soil is considered acidic, and if the pH value is less than 5.5, the soil is considered severely acidic.
• Soils in heavy rainfall areas are acidic because soluble basic salts such as Calcium, Magnesium, Potassium, Sodium are leached away by drainage water, leaving insoluble acidic residues made mostly of oxides and silicates of iron, silicon, and aluminium, which accumulate in significant amounts.
• Soil acidification is caused by the accumulation of hydrogen cations, which lowers the pH of the soil.
• Acidification can also occur when base cations from the soil, such as calcium, magnesium, potassium, and sodium, are leached.
• Soil acidity happens naturally as lichens and algae begin to erode rock surfaces. Acids continue to dissolve as soil forms.
• Soils in natural ecosystems grow increasingly acidic with time and weathering.
• Acid rain, agriculture, and pollution can all contribute to increased soil acidification rates.

Acidic Soil

*For detailed notes of this topic, check this link Acid soils

Sodic Soils

• Sodic soils form when soil is saturated with sodium salts and the exchange sites contain exchangeable sodium, which generally persists long after the soluble salts have been removed.
• Sodicity in soil is defined as a high concentration of sodium ions in comparison to other cations.
• The main indicator of sodicity is the amount of sodium in the soil, which is referred to as the Exchangeable Sodium Percentage (ESP).
• Sodicity in soil degrades soil properties by weakening soil particle bonds.
• An ESP of 6% is considered the threshold at which sodium cation in soil has a negative impact on soil structure when in contact with fresh water, causing clay dispersion.
• Some sodium stays attached to clay particles as sodium salts are leached through the soil, displacing other cations.
• Soils are often considered sodic when the amount of sodium impacts soil structure.
• By decreasing the link between soil particles, sodicity impairs soil characteristics.
• The soluble salts must be leached from the soil profile, and the exchangeable sodium must be replenished with calcium by gypsum treatments.
• Sodic soils can and frequently do include significant levels of soluble salts, in which case they are formally referred to as saline-sodic soils and provide unique management challenges.

Sodic soil

*For detailed notes of this topic, check this link Sodic soils

Conclusion

All soils with a certain set of clearly defined qualities are grouped together to form soil types. In general, "soil" is a very broad term that refers to the loose layer of earth that covers the planet's surface. Soil is a component of the earth's surface that consists of disintegrated rock, humus, inorganic and organic materials. It takes an average of 500 years or more for soil to form from rocks. Soil is typically formed when rocks are broken down into their constituent parts. When various forces act on the rocks, they break down into smaller pieces to form the soil.