Multi-span greenhouse irrigation and fertilization systems support intensive crop production. Drip irrigation delivers water and nutrients to each plant. Fertigation systems inject precise fertilizer doses. Subsurface drip systems reduce evaporation losses. Irrigation scheduling aligns with crop evapotranspiration. Salinity management prevents salt accumulation. Water treatment ensures proper pH and nutrient balance. Drainage systems prevent waterlogging. Automated control valves enable zone-specific irrigation.