How often should fertilizers be injected into the irrigation system?

The frequency of fertilizer injection into the irrigation system depends on several factors, including crop type, growth stage, soil type, and climate. As a general rule, fertilizers should be injected every 1-2 weeks during the growing season, with the exact frequency determined by soil tests, plant tissue analysis, and crop monitoring. It is essential to avoid over-fertilization, which can lead to environmental pollution and crop damage.