The correct option is Transition from dryland to intensive irrigated agriculture.
Explanation
The Indira Gandhi Canal (IGC) project was conceived to transform the arid and semi-arid desert lands of Western Rajasthan into agriculturally productive areas through the introduction of canal irrigation. This intervention fundamentally alters the region's land-use capability and cropping patterns.Analysis of Cropping Pattern Shift
- Traditional Dryland Agriculture: Historically, the region relied on rainfed agriculture. Crops like Bajra (Pearl Millet) and Jowar (Sorghum) are drought-hardy, require minimal water, and are well-suited to the erratic rainfall and sandy soils of the Thar Desert. These represent dryland farming systems.
- Impact of Irrigation: The introduction of the canal provided assured water supply. This allowed farmers to cultivate crops that are more water-intensive and sensitive to moisture stress.
- Wheat is a rabi crop that requires assured irrigation during the winter months.
- Cotton and Groundnut are commercial crops that require higher moisture levels than bajra or jowar to achieve optimal yields.
- Conclusion: The replacement of low-water-requiring coarse cereals with high-water-requiring cash and food crops signifies a structural shift from extensive dryland farming to intensive irrigated agriculture.
- Elimination of other options:
- Adoption of genetically modified varieties is incorrect because the primary driver of this specific crop shift is water availability, not merely genetic modification.
- Decline of commercial agriculture is incorrect because cotton and groundnut are cash crops; their cultivation indicates a rise, not a decline, in commercial agriculture.
- Restoration of traditional cropping systems is incorrect because the traditional system was based on bajra and jowar; the new pattern is a departure from tradition.
Key Takeaway
The introduction of irrigation in arid regions facilitates a shift from drought-resistant, subsistence crops (coarse cereals) to water-intensive, high-value commercial crops, marking the onset of intensive irrigated agriculture.