Fertilization is carried out through irrigation system, and crops absorb water and nutrients at the same time. Fertilization is usually carried out at the same time as irrigation, which is realized by injecting fertilizer solution into irrigation water pipeline under pressure. Irrigation water with dissolved fertilizer is sprayed on crops or dripped into the root zone through emitters (nozzles, micro-nozzles and drippers). Broadly speaking, the dissolution and application of fertilizers include spraying, dumping, spraying and pipeline application.

The premise of the integration of water and fertilizer is to dissolve the fertilizer first. And then applied in various ways. Such as foliar spray, shoulder spray, drag pipe spray, sprinkler irrigation, micro-sprinkler irrigation (the most popular hose spray in South China), drip irrigation, trunk injection and so on. Among them, drip irrigation has the best effect, because it prolongs the fertilization time, so it saves the most fertilizer.