The first weeks of the season decide how the rest of it goes. A drip system that has sat idle through winter or a fallow cycle has had time to collect sediment, dry out seals, shelter insects in lateral ends and lose the calibration it carried at the last harvest. A careful startup takes a day or two of labour; skipping it usually costs far more in clogged emitters, uneven watering and wasted fertilizer. The routine below is written for growers, farm managers and procurement teams who want a repeatable process that protects both the hardware and the crop.
Pre-Season Inspection and Flushing: Preparing the Hydraulic Core
Begin with the system depressurised, the pump locked out and the controller in manual. A dry walk-through exposes problems that pressurised water only makes worse. Start at the water source: inspect the intake screen, pump and headworks for debris, corrosion or loose connections, then work downstream through mainline, sub-mains and manifolds. Turn every valve by hand to confirm the handles move and the seals hold. Check pressure gauges for cracked lenses or stuck needles, and test air release and vacuum relief valves, which protect laterals from collapse when a block shuts down.
Along the rows, the inspection becomes physical. Lift drip tape and laterals at intervals and look for rodent gnawing, UV cracking, kinks, stretched sections and pulled fittings. Damage often concentrates at field margins, near hedgerows and around buildings, so check those edges carefully. Confirm that emitters are still in place — flag and arrow drippers on stakes are easily dislodged by wind, machinery or livestock — and that end caps and flush valves are intact. Replacing a handful of damaged fittings during a walk-through is far cheaper than diagnosing a dry strip of crop three weeks later.
Flush the Mains Before the Laterals
Flushing is the single most valuable step in any seasonal startup. Use a velocity high enough to lift and carry silt and biofilm out of the pipe rather than simply pushing it further along: fully open the flush valves at the end of each zone and let the water run until it clears. Flush mainlines first with lateral connections closed, then flush each tape run or lateral individually. Admit water slowly so air can escape through the vents, and shut down slowly to avoid water hammer, a common cause of blown fittings and split manifolds.
Service the filtration before the first irrigation cycle. Open disc and screen filters, inspect elements for tears and flattened gaskets, clean or replace them, and desilt centrifugal separators. Test automatic backflush timers and confirm the pressure differential across the filter head is within the range that triggers cleaning. Finally, pressure test at normal operating pressure and record the gauge readings for each block. That baseline makes it easy to spot a developing problem — a partially closed valve, a failing pump, a blocked sub-main — later in the season.
Fertigation Startup: Calibration, Compatibility and Injection Safety
Fertigation equipment usually suffers from neglect rather than wear. Months of inactivity can dry out the seals in a proportioning pump, harden an injector’s suction line or leave crystallised fertilizer in a tank. Before the first injection, clean the suction strainer and foot valve, inspect diaphragms, O-rings and non-return valves, and replace anything that has hardened or cracked. Confirm that a functioning backflow prevention device is fitted and that there is no physical possibility of nutrient solution siphoning back into a clean water source. Where the injection point sits upstream of a filter, check that the screen is correctly sized so that any precipitate is caught before it reaches the tape.
Calibrate, Then Verify at the Field End
Never assume a setting from last season still holds. Run a measured-volume test: draw a known quantity of stock solution over a timed run, compare the delivered volume with the intended injection rate, and adjust the pump or venturi accordingly. Then verify the result where it actually matters — at the emitter. Sample the solution at the beginning, middle and end of a block with a handheld EC and pH meter, and repeat after the system has run long enough for the injected front to travel the full length of the laterals. Log the settings, the date and the readings so the next calibration has a reference point.
Respect Fertilizer Compatibility
Most clogged drip systems blamed on water quality are partly a chemistry problem. Calcium sources combined with phosphate or sulfate fertilizers readily form precipitates, and mixing concentrated stocks in the wrong order can produce the same result. Use separate tanks for incompatible products, and carry out a simple jar test in a clear container before committing a new combination to the main system. Always finish an injection cycle with a clear-water flush long enough to push residual solution out of the laterals, and never leave fertilizer standing in tape or drippers overnight. Where water is hard or high in bicarbonates, a preventative acidification programme started early is cheaper than rehabilitating a scaled-up lateral later.
Drip Tape, Emitters and Procurement Planning for the First Weeks
Check emission uniformity early and in the field. Catching flow from a sample of emitters at the start, middle and end of several laterals into measuring cups over a fixed period shows whether the system is delivering what the design promised. Pressure-compensating drippers and tape hold a stable flow across a broad pressure band, which can mask a pump or pressure problem until the compensation limit is exceeded — so gauge readings at the head and tail of every block matter as much as the catch test. Adjustable and vortex drippers need to be checked individually for setting and cleaned of grit. Catching a uniformity problem in week one allows a targeted fix; catching it in week eight usually means lost yield.
Stock Spares Before the Peak
Startup is also a procurement exercise. Count what the season will realistically need — end caps, connectors, grommets, repair plugs, filter elements, pressure gauges, seals for injectors — and order ahead of peak demand rather than mid-blockage. Buying through an irrigation equipment manufacturer that produces tape, drippers, filters and fertigation units under one roof simplifies matching replacement parts to existing specifications and reduces the risk of a mid-season mismatch between new tape and older fittings. Distributors and wholesale buyers should confirm delivery schedules with their suppliers well before the local planting window opens, and keep a small reserve of the most frequently replaced components on the farm or in the depot.
Store What You Do Not Use Immediately
Leftover tape and laterals should stay boxed in shade, off hot concrete and away from sharp edges; UV-resistant materials are built for field exposure but not for months of direct sun in a yard. Seal opened cartons against dust and rodents, keep fittings sorted by size, and label stock by purchase date so older material is used first. A short written startup checklist — dry inspection, flush, filter service, pressure test, injector calibration, uniformity check — signed off and dated for each block turns a worthwhile habit into a measurable standard across the whole farm.
Busan environmental lawyer now in Montréal advocating river cleanup tech. Jae-Min breaks down micro-plastic filters, Québécois sugar-shack customs, and deep-work playlist science. He practices cello in metro tunnels for natural reverb.