Soil Erosion and Conservation in India — Types, Methods, Watershed Management, and Soil Health Card

Soil is India’s most critical natural resource. About 130 million hectares (nearly 40% of India’s land area) suffer from soil degradation. Soil erosion, conservation methods, and government schemes are high-frequency PSC topics.

1. Types of Soil Erosion

Type	Description	Where Common
Sheet erosion	Thin, uniform layer of topsoil removed by water flowing over a large area	Gentle slopes; agricultural plains
Rill erosion	Water cuts small channels (rills) in the soil	Moderate slopes; ploughed fields
Gully erosion	Deep channels (gullies) carved by concentrated water flow; forms ravines	Chambal Valley (MP/Rajasthan), Yamuna ravines (UP)
Stream/river bank erosion	Rivers erode their banks, especially during floods	Brahmaputra (Assam), Kosi (Bihar)
Wind erosion	Topsoil blown away by wind	Thar Desert (Rajasthan), arid regions of Gujarat
Splash erosion	Raindrops dislodge soil particles on impact	Bare, uncovered soil
Landslide/mass movement	Soil and rock move downhill due to gravity	Western Ghats (Kerala), Himalayas
Coastal erosion	Sea waves erode coastal land	Kerala coast, Sundarbans

PSC Favourite: “Chambal Valley is famous for which type of erosion?” — Gully erosion (forming ravines/badlands).

2. Causes of Soil Erosion

Cause	Detail
Deforestation	Removes protective tree cover; roots no longer bind soil
Overgrazing	Livestock destroy grass cover, leaving soil exposed
Shifting cultivation (Jhum)	Slash-and-burn in northeast India leaves soil unprotected
Faulty agricultural practices	Ploughing along slopes, monoculture, removing crop residue
Construction and mining	Exposes subsoil; disturbs natural drainage
Heavy rainfall	Intense monsoon rains cause sheet and gully erosion
Wind	Arid and semi-arid regions lose topsoil to wind

3. Soil Conservation Methods

Biological/Vegetative Methods

Method	Description
Afforestation	Planting trees to bind soil and reduce runoff
Contour ploughing	Ploughing along the contour lines of a slope (not up-down); slows water flow
Strip cropping	Alternating strips of erosion-resistant crops with regular crops
Cover cropping	Growing crops specifically to cover and protect the soil between seasons
Mulching	Covering soil with organic matter (straw, leaves) to reduce evaporation and erosion
Crop rotation	Alternating crops to maintain soil fertility and structure
Agroforestry	Combining trees with crops to protect soil and add organic matter
Grass waterways	Planting grass in natural drainage channels to slow water and trap sediment

Mechanical/Engineering Methods

Method	Description
Terrace farming	Cutting flat steps into hillsides; reduces slope length and water velocity
Contour bunding	Building low embankments along contours to trap water and soil
Check dams	Small barriers across gullies to slow water flow and trap sediment
Gabion structures	Wire mesh baskets filled with rocks; placed in gullies and along river banks
Retention walls	Stone or concrete walls to prevent landslides
Diversion channels	Channels that redirect excess water away from erosion-prone areas
Bench terracing	Level platforms on steep slopes for cultivation
Gully plugging	Blocking gullies with stones, brushwood, or concrete to stop further erosion

Chemical Methods

Method	Description
Soil conditioners	Polymers applied to soil to improve structure and water retention
Bio-engineering	Using living plants combined with engineering structures

4. Watershed Management

Aspect	Detail
Definition	Integrated management of a drainage basin (watershed) to conserve soil, water, and vegetation
Objective	Reduce runoff, prevent soil erosion, recharge groundwater, improve productivity
Key principle	”Ridge to valley” approach — start conservation from the ridge (top of watershed) and work downward

Major Watershed Management Programmes in India

Programme	Year	Key Feature
Drought Prone Areas Programme (DPAP)	1973	For drought-prone districts
Desert Development Programme (DDP)	1977	For hot and cold desert areas
Integrated Watershed Development Programme (IWDP)	1989	Later merged into IWMP
Integrated Watershed Management Programme (IWMP)	2009	Merged DPAP, DDP, IWDP; umbrella scheme
Pradhan Mantri Krishi Sinchayee Yojana (PMKSY)	2015	”Har Khet Ko Pani”; watershed component merged into PMKSY
Neeranchal National Watershed Project	2016	World Bank-assisted; strengthens IWMP implementation

5. Important Soil-Related Organisations

Organisation	Full Form	Role
NBSS and LUP	National Bureau of Soil Survey and Land Use Planning	Soil survey, classification, mapping; HQ: Nagpur
ICAR	Indian Council of Agricultural Research	Agricultural research including soil science
IISS	Indian Institute of Soil Science	Soil research; HQ: Bhopal
CSWCRTI	Central Soil and Water Conservation Research and Training Institute	Now ICAR-IISWC (Indian Institute of Soil and Water Conservation); HQ: Dehradun
Soil Conservation Department	State-level	Implements soil conservation schemes

6. Soil Health Card Scheme

Aspect	Detail
Launched	19 February 2015 by PM Modi (from Suratgarh, Rajasthan)
Objective	Provide every farmer a Soil Health Card with nutrient status and fertiliser recommendations
Cycle	Cards issued every 2 years (one cycle = 2 years)
Parameters tested	12 parameters — 6 macronutrients (N, P, K, S, Zn, Fe/Ca/Mg) and soil pH, EC, OC, and micronutrients (Fe, Mn, Cu, Zn, B)
Who issues	State Agriculture Department through soil testing laboratories
Format	Card shows nutrient status (low/medium/high) and crop-wise fertiliser recommendation
Impact	Over 22 crore cards distributed by 2023; aims to reduce excess fertiliser use
Online portal	soilhealth.dac.gov.in

12 Parameters on Soil Health Card

Category	Parameters
Primary nutrients (Macro)	Nitrogen (N), Phosphorus (P), Potassium (K)
Secondary nutrients	Sulphur (S)
Micronutrients	Zinc (Zn), Iron (Fe), Copper (Cu), Manganese (Mn), Boron (B)
Physical parameters	pH (acidity/alkalinity), Electrical Conductivity (EC), Organic Carbon (OC)

7. Soil Types of India — Quick Reference

Soil Type	Colour	Region	Crops Suited
Alluvial	Light grey to ash	Indo-Gangetic Plain, river deltas	Rice, wheat, sugarcane
Black (Regur)	Dark black	Deccan Plateau (Maharashtra, Gujarat, MP)	Cotton (“black cotton soil”)
Red and Yellow	Red/yellow	Chhota Nagpur Plateau, eastern Deccan, Odisha, parts of Kerala	Groundnut, millets, tobacco
Laterite	Red/brick-red	Kerala, Karnataka, Meghalaya, Malabar Coast	Tea, coffee, cashew, rubber
Arid/Desert	Sandy, light brown	Thar Desert, Rajasthan	Bajra, jowar (with irrigation)
Saline and Alkaline	White encrustations	Rann of Kutch, parts of Punjab, Haryana, UP	Needs reclamation; gypsum treatment
Forest/Mountain	Dark brown	Himalayan regions, Western Ghats	Plantation crops, orchards
Peaty/Marshy	Dark, organic-rich	Kerala (Kuttanad), Sundarbans, parts of UP	Rice (Kuttanad “below sea level” farming)

PSC Favourite: “Laterite soil is formed by?” — Intense leaching in tropical areas with heavy rainfall. Laterite = Latin “later” (brick); hardens when exposed to air.

8. Soil Erosion in India — Key Statistics

Parameter	Detail
Land area affected by soil degradation	About 130 million hectares (37% of land area)
Annual soil loss	About 5,334 million tonnes/year
Topsoil loss due to erosion	About 16.4 tonnes/hectare/year (national average)
Most erosion-prone region	Shivalik Hills, Chambal ravines, northeast shifting cultivation areas
Ravine-affected states	Madhya Pradesh, Uttar Pradesh, Rajasthan, Gujarat (total: ~4 million hectares)

9. Previous Year PSC-Style Questions

Question	Answer
Chambal ravines are formed by which type of erosion?	Gully erosion
Contour ploughing is a method of?	Soil conservation
Soil Health Card scheme was launched in?	2015
NBSS and LUP headquarters?	Nagpur
Laterite soil is common in?	Kerala, Karnataka, Meghalaya
Black soil is also called?	Regur soil
Black soil is best suited for?	Cotton cultivation
Watershed management follows which approach?	Ridge to valley
Kuttanad farming in Kerala uses which soil?	Peaty/marshy soil (below sea level)
Which scheme merged DPAP, DDP, and IWDP?	Integrated Watershed Management Programme (IWMP)
Soil Health Card tests how many parameters?	12
Wind erosion is most common in?	Thar Desert, Rajasthan