Laterization - Agriculture Notes

Laterization is a sort of weathering process that converts rock to laterite. The final product has a wide range of grade, thickness, chemistry, and ore mineralogy. Tropical weathering is another name for lateralization. Chemical and physicochemical changes are included. Laterization is the reversal process of podzolization in that it removes silica from the higher layers instead of sesquioxides, allowing sesquioxides to accumulate in the solum. The process takes place in tropical rain forests with warm and humid (tropical) climates, and basic parent materials that are suitable for such soils. This article will explain to you about Laterization which will be helpful in preparing the Agriculture Syllabus for the UPSC Civil Service exam.

Table of Contents

Laterization
Laterites or Latosols (Oxisols)
Conclusion
FAQs
MCQs

Laterite Profile

What is Laterization?

Laterization is the process of removing silica from the upper layers rather than sesquioxides, allowing sesquioxides to concentrate in the solum.
It refers to a specific cemented horizon in certain soils that, when dried, becomes extremely hard, similar to a brick.
Laterization is a pedogenic (soil formation) process that occurs in tropical and subtropical regions.
Laterization is especially widespread in tropical locations with a long dry season and a close-to-surface water table.
It entails chemical and physical changes, as well as the transformation of basic rock-forming minerals into compounds rich in lattice clay minerals and laterite elements.
Laterization is the weathering process that produces laterite.
Soils and rocks are depleted of soluble compounds, such as silica-rich and alkaline components, and enriched in soluble substances, such as hydrated aluminium and iron oxides, throughout the process.
It consists of three steps:
The first phase is decomposition, which includes the disintegration of minerals, releasing component elements such as calcium oxide, magnesium oxide, and so on.
Laterization, which involves leaching, is the second phase (loss of soluble substances and colloids from the topmost layer of soil).
Dehydration or desiccation of minerals is the third phase.
It refers to a special cemented horizon in some soils that, when dried, becomes extremely hard, similar to a brick.
Laterites or latosols (Oxisols) are soils in the tropics that have been extensively mixed with sesquioxides (iron and aluminium oxides) to the amount of 70 to 80% of the total mass.
Soil degradation, also known as retrogression, is a deterioration in soil condition caused by incorrect usage or bad management.
Water purification entails the removal of impurities, and methods employed include sedimentation, filtration, and so on.
Soil sterilisation is a chemical or physical technique that causes organisms in the soil to die.

Other Relevant Links
Soil Components	Podzolization
Soil profile	Soil Terracing
Soil texture	Gleization
loam soil texture	Salinization
Soil structure	Desalinization
Types of soil	Alkalization
Desertification	Dealkalization
Water logging	Stages of Soil Erosion

Laterites or Latosols (Oxisols)

Laterite is a soil and rock type rich in iron and aluminium that is thought to have originated in hot and humid tropical environments.
Because of the high iron oxide concentration, nearly all laterites are rusty-red in colour.
They form as a result of intense and extended weathering of the underlying parent rock, commonly during times of high temperatures and heavy rainfall with alternate wet and dry intervals.
Tropical weathering (laterization) is a long-term chemical weathering process that results in a wide range of thickness, grade, chemistry, and ore mineralogy in the ensuing soils.
The soil usually has a thin but extremely fertile layer of humus shed from plants and animals in the forest above, followed by an infertile second layer owing to quick leaching from the heavy rain.
Weathered bedrock, the third stratum, is found in practically all soil types.
Because all nutrients leak out fast when the forest is destroyed and the layer of humus is no longer being renewed, the latosol is fully dependent on the rainforest to sustain fertility.

Laterites or Latosols

Laterite soils may be found mostly in Karnataka, Kerala, Tamil Nadu, Madhya Pradesh, Andhra Pradesh, and hilly portions of Odisha and Assam.
This soil is especially good for growing tea and coffee if adequate soil conservation practices are used, notably in hilly parts of Karnataka, Kerala, and Tamil Nadu.

Conclusion

The term laterite is derived from the word later, which means brick or tile, and was originally applied to a group of high clay Indian soils found in Kerala, Tamil Nadu, Karnataka, and Maharashtra's Malabar hills. Laterite is often pisolitic (pealike). Exposed surfaces range in colour from blackish-brown to reddish and have a slaggy, scoriaceous, lavalike appearance. It is generally lighter in colour (red, yellow, and brown) where freshly broken, and it is soft when freshly quarried but hardens with exposure.

Other Relevant Links
Agriculture Notes	Soil
System of Rice Intensification (SRI)	Watershed Management
Factors determining cropping pattern in India	Sustainable Sugarcane Initiative (SSI)
Farming Systems	Different Types of Irrigation and Irrigation Systems
Sustainable Agriculture	Organic Farming

FAQs

Question: What is laterization in the context of soil formation?

Answer: Laterization is a soil formation process that occurs in tropical and subtropical climates, characterized by high rainfall and warm temperatures. This process leads to the development of laterite soils, which are rich in iron and aluminum oxides due to the leaching of soluble minerals. Laterization results in the formation of a hard and clayey layer of soil, often found in regions with intense weathering and significant chemical reactions.

Question: What are the key characteristics of laterite soil?

Answer: Laterite soil exhibits several distinctive characteristics, including a reddish color due to the high iron content, a coarse texture, and a low nutrient-holding capacity. These soils are typically acidic and can become hard upon drying. Laterite soils also have a high clay content, which can impact water retention and drainage, making them less suitable for certain agricultural practices without appropriate management.

Question: How does laterization affect agricultural practices?

Answer: Laterization can significantly impact agricultural practices by limiting soil fertility and nutrient availability. The high acidity and low organic matter content can restrict the growth of certain crops. Farmers in laterite soil regions often need to amend the soil with organic fertilizers and implement appropriate cropping systems to enhance productivity. Additionally, managing water retention and drainage is crucial for successful agriculture in these soils.

Question: In which regions is laterization most commonly found?

Answer: Laterization is most commonly found in tropical and subtropical regions, particularly in areas with high rainfall and warm temperatures. This includes parts of Africa, Southeast Asia, and some regions of South America. In India, laterite soils are prevalent in the Western Ghats, parts of Odisha, West Bengal, and Assam, where the climatic conditions favor the laterization process.

Question: What is the significance of laterite soils in construction?

Answer: Laterite soils have significant importance in construction, particularly in regions where they are abundant. Due to their hardness when dried, laterite can be quarried and used as building material, especially for low-cost housing and road construction. The unique properties of laterite make it suitable for creating bricks and other construction elements that are both durable and eco-friendly.

MCQs

1. Laterization primarily occurs in which type of climate?

A) Arid
B) Tropical
C) Temperate
D) Polar