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Dept : AGRI

Sem : 3

Regul : 2023

Faculty : Ms R Atchaya

phone : 9944490551

E-mail : atchaya.r.agri@snsct.org

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Lecture Notes

UNIT 1:

Definition of soil, rocks and minerals and soil formation

Pedalogical concepts

Weathering and it types

Chemical weathering of soil

Definition of soil, rocks and minerals and soil formation

Biological weathering of soil

Physical weathering of soil

Nature and Origin of soils

Edaphological concepts

Factors affecting soil formation processes

UNIT 2:

Types of soils

Soil texture define and concept

Gradation analysis

Major types of soils in India

Major types of soils in Tamilnadu

PHASE RELATIONSHIP OF SOIL

Textural classes

Gradation analysis

UNIT 3:

Introduction to Soil properties

Physical properties of soil and significance

Particle density and porosity soil particle

Soil physical constrains

Soil colour, soil temperature, soil water.

Soil inorganic colloids

Composition of inorganic colloids

Management of Soil physical constraints

UNIT 4:

Soil water - Soil water potentials

Hydraulic conductivity

Beneficial effects

Soil Micro organisms

Harmful effects

Drainage

UNIT 5:

Carbon cycle

Nitrogen cycle

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