Water is an increasingly scarce and costly resource in agriculture. Climate change, prolonged droughts and competing demands make water-saving irrigation an urgent need. Drip irrigation combined with soil moisture sensors and automation is opening a path for farmers to use water more efficiently, especially in dry regions.
Why save irrigation water?
Traditional flood or broad-spray irrigation loses much water to evaporation, deep percolation and runoff. Only part of the water is actually taken up by the crop. As many regions face seasonal shortages, this approach no longer fits.
Water-saving irrigation aims to deliver water to the root zone, in the right amount and at the right time, reducing loss and raising water-use efficiency per unit of output.
Drip and sprinkler technology
Several water-saving methods exist, each suited to different crops and terrain.
- Drip irrigation: slowly delivering water to the root zone, cutting evaporation and weeds.
- Sprinkler irrigation: fine spray for dense crops and large areas.
- Subsurface irrigation: below-ground supply that minimises surface evaporation.
- Fertigation: dissolving fertiliser into irrigation water for precise nutrition.
Moisture sensors and automation
Soil moisture sensors are the 'eyes' that tell an irrigation system when and how much water to supply. Combined with automatic controllers and weather data, the system can water to actual need rather than a fixed schedule.
- Watering to the real need of soil and crop, avoiding excess.
- Reducing labour through automation.
- Early alerts for leaks, blockages or water shortage.
Water-saving is not merely using less water, but using exactly the amount the crop truly needs, at the right time and place.
Efficiency and use in dry regions
Compared with traditional methods, sensor-based drip irrigation can save roughly 30-50% of water while often improving crop uniformity and yield through stable moisture. In dry or seasonally water-short regions this can be decisive for keeping production going.
Still, upfront cost, water quality requirements and operation and maintenance skills must be considered. Choosing the right scale and technology for each crop, soil and household capacity is key to success.
ASTRI Institute regards water-saving irrigation and precision agriculture as research directions tied to climate adaptation and sustainable resource use. Through applied research, model testing and training transfer, the Institute aims to help Vietnamese farmers access efficient, water-saving irrigation solutions suited to increasingly harsh conditions.