irrigation

As nouns the difference between irrigation and chemigation

is that irrigation is irrigation (the act or process of irrigating) while chemigation is (agriculture) the application of a pesticide or fertilizer through an irrigation system.

As nouns the difference between irrigation and aflaj

is that irrigation is the act or process of irrigating, or the state of being irrigated; especially, the operation of causing water to flow over lands, for nourishing plants while aflaj is an irrigation system which catches mountain water and controls its movement down man-made subterranean channels, found in Oman.