Soil Problems of Rajasthan

Rajasthan faces some of India's most acute soil degradation challenges, driven by its extreme climate, land-use pressure, and irrigation expansion.

5.1 Wind Erosion — (Thar Desert)

Wind erosion is Rajasthan's dominant soil degradation process. The state accounts for approximately 59% of India's wind-eroded land area. In active dune zones of Jaisalmer and western Barmer, wind removes 60–100 tonnes of topsoil per hectare per year. The finer clay and silt particles — which carry soil nutrients and organic matter — are preferentially removed, leaving behind coarser, nutrient-depleted sand.

Hotspot districts: Jaisalmer, Barmer, Bikaner, Jodhpur, Churu, Sikar, Jhunjhunu.

Factors worsening wind erosion:

• Removal of khejri (Prosopis cineraria) and other native xerophyte trees for fuel wood
• Overgrazing by livestock on already sparse vegetation
• Reduction in traditional orans (community protected pastures) and their tree cover
• Climate change increasing wind speed and drought frequency

CAZRI-developed countermeasures:

• Shelter belts: Rows of trees planted perpendicular to prevailing wind direction reduce wind speed by 40–60% in the lee. Recommended species: Prosopis cineraria, Acacia tortilis, Eucalyptus.
• Sand dune stabilization: Grass strips (sewan grass, bui grass) planted on dune slopes; jute geo-textile mats on active slipfaces.
• Stubble mulching: Leaving crop residue on soil surface after harvest reduces saltation velocity.

Water erosion occurs in two sub-zones:

Gully/Ravine erosion: The Chambal ravines in Kota, Bundi, Sawai Madhopur, and Dholpur are one of India's worst water erosion zones. Over 3.78 lakh hectares of once-cultivable land in Rajasthan have been converted to ravine wasteland by Chambal tributaries. The Chambal River's high seasonal discharge and soft alluvial banks create a cycle of undercutting, bank collapse, and gully extension.

Sheet and rill erosion on Aravalli slopes: The denuded southern Aravalli slopes (Ajmer, Pali, Rajsamand, Udaipur) experience intense monsoon sheet wash removing topsoil from hill faces. The National Watershed Development Programme and MGNREGA have invested substantially in contour bunding and bund vegetation along these slopes.

5.3 Waterlogging and Secondary Salinization — IGNP Command Area

The Indira Gandhi Nahar Pariyojana (IGNP), while transforming western Rajasthan agriculture, has created significant secondary soil degradation. Canal irrigation raised the water table from > 30 m depth (1980s, pre-canal) to < 2 m in some areas (2000s–present) in Sri Ganganagar, Hanumangarh, and northern Bikaner.

Current extent of degradation (2024):

• Waterlogged area: ~1.54 lakh hectares (source: Rajasthan Agriculture Department)
• Saline-affected area within IGNP command: ~35,000 hectares actively in reclamation
• Crop yield decline in waterlogged zones: 40–70% below potential

Remedies deployed:

• Sub-surface drainage pipe network (tiles) — Central Ground Water Board + state government
• Lining of irrigation canals to reduce seepage losses
• Adopting drip/sprinkler irrigation to reduce per-hectare water application
• Switching crops: water-intensive wheat → less water-demanding mustard or chickpea

Rajasthan's soils are characteristically deficient in several key plant nutrients:

Nutrient	Deficiency Extent	Most Affected Districts	Symptoms
Nitrogen (N)	Near-universal in desert soils	All western districts	Pale yellowing of leaves; stunted growth
Phosphorus (P)	Widespread in acidic red soils	Dungarpur, Banswara	Poor root development, delayed maturity
Zinc (Zn)	~55% of Rajasthan's cultivated soils	Ganganagar, Bikaner, Hanumangarh	Khaira disease in paddy; leaf mottling
Sulphur (S)	Increasing; oilseed-growing areas	Alwar, Bharatpur, Ajmer	Yellowing of young leaves in mustard
Boron (B)	Significant in Hadoti region	Kota, Bundi, Jhalawar	Poor flowering, fruit set failure
Iron (Fe)	Calcareous/alkaline soils	Bikaner, Jodhpur, Churu	Interveinal chlorosis

Source: Rajasthan Soil Health Survey data, ICAR-CAZRI, 2022-23

The Soil Health Card Scheme (see Section 7) directly addresses this by providing farm-level nutrient status data.

Beyond the IGNP-affected zone, natural saline conditions in Rajasthan's inland drainage basin affect soil quality. The Shekhawati basin (internal drainage) accumulates salts in its depressions and playas. The Sambhar Salt Lake complex supports India's oldest and largest inland saltworks (operated by Sambhar Salts Limited — a joint venture of Hindustan Salts Limited and Rajasthan government), but the surrounding salt-affected fringe lands are unproductive.

Sodic soils (alkaline — pH > 8.5) are reclaimed with gypsum application. Rajasthan's own abundant gypsum reserves in Bikaner and Nagaur provide this amendment economically. State government has facilitated subsidized gypsum supply to affected farmers through the Agriculture Department since 2018.

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