Irrigation · August 2025 · 5 min read
Fertigation combines fertilizer application with irrigation, delivering nutrients directly to the root zone with precise timing. This method improves nutrient efficiency, reduces labor, and allows split applications that match crop demand throughout the growing season.
UAN solutions (28-0-0 or 32-0-0) are the most common fertigation nitrogen sources due to their solubility and ease of handling. Potassium chloride and potassium thiosulfate dissolve readily for potassium applications. Avoid mixing incompatible products — calcium and sulfate solutions, for instance, form gypsum precipitate that will clog emitters and nozzles.
Choose an injection pump rated for the chemical being applied — diaphragm pumps handle corrosive solutions well, while piston pumps offer precise metering. Install a check valve and vacuum breaker between the injection point and the water source to prevent backflow contamination. Calibrate the injection rate by measuring output volume over time and comparing it to your target parts per million at the nozzle.
Begin fertigation after the irrigation system has pressurized and water is flowing uniformly, then stop injection 15–30 minutes before shutdown to flush fertilizer from the lines. Apply nitrogen in multiple small doses during peak uptake stages rather than one large application. Post warning signs on fertigation systems, maintain safety data sheets on-site, and follow all state chemigation permit requirements.
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