Emitter Spacing Explained: Why 30 cm and 40 cm Suit Different Crops

What emitter spacing actually controls

Discharge tells you how fast water comes out. Spacing tells you where it lands and how much of the root zone it reaches. Those are two different decisions, and only the first one is usually discussed.

Spacing also decides how many outlets you are buying. A 5000 m roll carries far more outlets at 30 cm than at 40 cm, so the per-acre cost of an outlet falls as the spacing tightens. That is worth knowing before you compare two rolls by price alone.

Tighter spacing, around 30 cm

Tighter spacing suits crops that want a small, frequent dose and an even moisture band rather than a deep soak. That is the pattern high-value horticulture responds to, because even moisture across the root zone drives fruit size and uniformity rather than simply keeping a plant alive.

Our 16 mm lateral with emitters fixed at 30 cm is the finest-spacing option we manufacture, putting roughly 33,000 outlets into a single 5000 m roll. It is the better choice for close-spaced crops and for soils that do not spread water laterally very far.

Wider spacing, around 40 cm

Wider spacing suits crops with larger root volumes, wider plant spacing, or heavier soils that carry moisture sideways on their own. One outlet can then serve more soil, and you are not paying for emitters that wet ground the roots already cover.

Our 12 mm and 16 mm laterals with emitters at 40 cm are the rolls most often specified for closely spaced row crops, where the aim is even coverage along the row rather than a dense grid of outlets.

Common questions

Does closer spacing mean less water used?

Not by itself. Closer spacing spreads the same water over more outlets, so each outlet delivers less. Total water use is set by discharge, run time and the number of emitters, not by spacing alone.

Can I change the emitter spacing after buying?

Not on an inline lateral — the emitters are factory-fixed. If you need spacing you can change between seasons, choose plain lateral and fit on-line drippers, which can be moved and the old holes plugged.

Which spacing is better for sandy soil?

Sandy soils do not carry water sideways well, so moisture stays close to the outlet. That usually argues for tighter spacing than you would choose on a heavier soil, where the wetted zone spreads further on its own.