Introduction
Agriculture accounts for over 80% of India's freshwater withdrawals, yet conventional surface flood irrigation operates at a low Water Use Efficiency (WUE) of just 30–40%. Micro-irrigation technologies, primarily drip and sprinkler systems, enhance WUE to 75–90%, making them central to sustainable agriculture and water security in India.
Mechanisms of Water Efficiency through Micro-Irrigation
- Precision Root-Zone Delivery: Supplies water directly near the plant root zone via emitters and micro-tubes, minimizing conveyance, surface runoff, and evaporation losses, which delivers 30–50% overall water savings.
- Fertigation Synergy: Combines water delivery with dissolved plant nutrients, curtailing nutrient leaching by 25–30%, improving soil health, and preventing soil waterlogging and secondary salinization.
- Aquifer Preservation: Drastically curtails groundwater over-drafting in critical drought-prone tracts such as Marathwada and Rayalaseema, while expanding productive farming to undulating, non-canal terrains.
- Energy-Water Nexus Optimization: Operates at lower pressure heads compared to flood methods, reducing agricultural pumping energy by 20–30%, which indirectly curbs excessive groundwater drawdowns.
Key Challenges and the Way Forward
- Regional Disparities: Despite covering over 115 lakh hectares under the Per Drop More Crop initiative, adoption is predominantly concentrated in western and southern states such as Maharashtra, Gujarat, and Andhra Pradesh.
- Community Micro-Irrigation Models: Addressing land fragmentation among small and marginal farmers through large-scale community micro-irrigation projects, such as the Ramthal Drip Irrigation Project in Bagalkot, Karnataka, ensures shared infrastructure access.
- Technology Integration: Coupling micro-irrigation with solar-powered irrigation under PM-KUSUM provides decentralized, reliable power and institutionalizes climate-resilient water management.
Conclusion
Transitioning from supply-driven flood irrigation to demand-managed micro-irrigation is indispensable for climate adaptation in Indian agriculture. Broadening coverage through tailored subsidies, community networks, and smart sensor integration will ensure sustainable food production under growing hydrological stress.