Irrigation Methods Compared
What You’ll Learn
Drip irrigation saves 30 to 50% of water compared to flood irrigation and cuts foliar disease risk significantly.
Water before 10am — it gives foliage time to dry and minimises the risk of fungal infection.
Pair any irrigation method with organic mulching for the best water efficiency and the least evaporation.
Drip Irrigation
Drip irrigation puts water exactly where it is needed — at the root zone through emitters — saving 30 to 50% compared to flood methods. Because foliage stays dry, fungal disease pressure drops significantly. The setup cost is higher, but the water savings and better yields typically pay it back within one to two seasons.
Furrow and Flood Irrigation
Furrow irrigation runs water along rows and suits row crops on gentle slopes well. It needs little equipment, though it uses considerably more water than drip. Flood irrigation is the simplest option but wastes the most — much of it runs off or soaks below the root zone where your plants cannot use it.
Sprinkler Irrigation
Sprinkler systems give uniform coverage across the field by mimicking natural rainfall. The trade-off is that wet foliage raises the risk of fungal disease, especially in humid conditions. Sprinklers work best for crops that handle wet leaves well — grass crops and some brassicas, for example.
Getting the Most from Every Drop
Whichever method you use, water in the early morning to cut evaporation and reduce disease risk. Lay organic mulch around your plants to reduce soil evaporation by 25 to 40%. Match your watering frequency to your crop and soil — sandy soils need frequent light applications, while clay soils do better with less frequent but deeper watering.