For maize on 0.75 m rows, use 16 mm drip tape with a 0.2 mm wall, 30 cm emitter spacing and 1.6–2.0 L/h per emitter at 1.0 bar. That works out to about 13,300 metres of tape per hectare, or 14 rolls of 1,000 m with a 5% allowance for joints and damage.
Below is the specification we quote most often for field maize, the arithmetic behind the roll count, and the installation details that decide whether the tape lasts one season or three.
Drip tape running along each maize row, laid at the same time as the seed bed.
What maize actually needs from drip tape
Maize is a deep-rooted, high-water-demand crop. A commercial crop transpires 500–600 mm of water over a season, and most of that falls in a six-week window around tasselling and grain fill. Missing that window costs yield that no later irrigation can recover.
Drip tape suits maize for three reasons:
- Water goes where the roots are. Emitters sit 5–10 cm from the plant line, so the wetted bulb forms under the root zone instead of between rows.
- The canopy stays dry. Unlike overhead irrigation, drip keeps leaves dry, which lowers leaf disease pressure during humid periods.
- Fertigation is simple. Soluble nitrogen and potassium go in with the irrigation water, and the crop takes them up in the same pass.
The trade-off is filtration and maintenance. Drip tape with 0.2 mm walls and small emitter passages will block if sand and organic debris reach the tape, so the filter is not optional equipment.
The specification that fits maize
| Parameter | Field maize | Notes |
|---|---|---|
| Tape diameter | 16 mm | 12 mm works for short runs under 80 m |
| Wall thickness | 0.2 mm | 0.15 mm for single season, 0.3–0.4 mm for multi-season use |
| Emitter spacing | 30 cm | 20 cm on sandy soil, 40–50 cm on heavy clay |
| Emitter flow | 1.6–2.0 L/h | Higher flow on sand, lower on clay |
| Working pressure | 1.0 bar | Tape rated 0.6–1.5 bar |
| Max run length | 150–180 m | Shorter runs at low pressure |
| Filtration | 120 mesh screen or 2″ sand filter | Mandatory with surface water |
Row spacing drives the tape count more than any other decision. On 0.75 m rows, one tape per row is standard. On 1.4 m twin-row beds, one tape between two rows of plants is enough, and it halves the tape quantity.
If your rows are 0.9 m or wider and the soil holds water well, a single tape can serve two rows. On sand, keep one tape per row.
How much tape per hectare
The arithmetic is straightforward. One hectare is 10,000 m². Divide by your row spacing to get the metres of row, which equals the metres of tape for one tape per row.
10,000 m² ÷ 0.75 m row spacing = 13,333 m of row per hectare
13,333 m ÷ 1,000 m per roll = 13.3 rolls
13.3 rolls × 1.05 (5% for joints and damage) = 14 rolls
So a 10-hectare block on 0.75 m rows needs roughly 140 rolls of 1,000 m tape. The same block on 1.4 m twin-row beds needs about 75 rolls, because one tape serves two rows.
Add a little more if:
- runs are longer than 150 m and you need to cut tape into two laterals
- the field has irregular corners
- you plan to replace the tape mid-season
For a quick check on your own field: metres of tape = (area in m² ÷ row spacing) × 1.05.
Flow rate, pressure and filtration
Emitter flow and run length are linked. A 1.6 L/h emitter on a 150 m run at 1.0 bar gives fairly even discharge along the line. Push the same tape to 250 m and the pressure loss at the far end becomes visible: the last emitters deliver noticeably less water, and the crop at the end of the run shows it first.
Three rules that hold in practice:
- Keep runs under 180 m unless you use a higher-flow tape and a pressure-compensating design.
- Flush the lines. Open the end of each lateral for two to three minutes at every irrigation cycle. This is the single cheapest way to avoid blocked emitters.
- Filter to 120 mesh. Surface water, pond water and even well water with fine sand need filtration. A blocked emitter cannot be cleaned; a filter cartridge can.
Fertigation adds one more requirement: inject fertiliser upstream of the filter, and flush with clean water for 15–20 minutes afterwards so the tape is not left full of nutrient solution.
Installation mistakes that cost a season
Most failures we see are installation problems, not tape quality.
Tape buried too deep. On surface installation, anchor the tape with soil or clips every 3–5 m so wind does not lift it. If you bury the tape, 5–10 cm below the surface is enough for maize; deeper placement puts it below the wetted bulb during early growth.
Tape installed before the bed is settled. If the bed is still soft, the tape sinks and the emitter outlets sit in mud. Prepare the bed, then lay tape and mulch film in the same pass.
Wrong end connections. A tape-to-manifold connection that leaks at 1 bar loses more water than the crop uses in a day. Use compression fittings sized to the tape diameter, and check every joint at pressure before planting.
No pressure gauge. Without a gauge at the head of the block, you cannot tell whether the system is running at 0.6 bar or 1.2 bar. Emitter flow changes with pressure, and so does the wetted pattern.
Mulch film laid over dry soil. If you combine drip tape with black mulch film, irrigate before laying the film or immediately after. Dry soil under film stays dry, and the tape cannot rewet it fast enough.
Inline emitters release water in a steady trickle, forming a wetted bulb under the plant.
Packing, MOQ and container loading
Tape ships as flat coils wound on a core, wrapped and packed in export cartons.
- Standard coil: 1,000 m per roll, coil diameter about 30–40 cm depending on wall thickness
- Carton: single-roll or double-roll cartons, stacked on pallets
- Roll weight: a 16 mm / 0.2 mm 1,000 m roll weighs roughly 9–10 kg
- Container loading: a 40HQ is usually volume-limited before weight-limited on tape. We prepare a loading plan per order and confirm the exact count before booking.
For a 10-hectare block, 140 rolls is a small order and fits comfortably in a shared container with mulch film, shade net or seedling trays. Mixed loads are common for first orders because they let a distributor test several product lines in one shipment.
Our standard MOQ is one pallet per specification. Custom widths, colours and print on the tape are available from 5 tonnes per run.
Finished tape stacked on pallets, packed and ready for container loading.
FAQ
What emitter spacing should I use for maize? 30 cm on medium soil, 20 cm on sand and 40–50 cm on heavy clay. Tighter spacing on sand keeps the wetted bulbs overlapping; wider spacing on clay avoids waterlogging between emitters.
How many metres of drip tape do I need per hectare? About 13,300 m on 0.75 m rows with one tape per row, which is 14 rolls of 1,000 m including a 5% allowance. On 1.4 m twin-row beds, roughly 7,500 m, or 8 rolls.
Can drip tape be used for more than one season? Yes, if you choose a 0.3–0.4 mm wall. Thin 0.15–0.2 mm tape is designed for one season and is usually recycled or removed at the end of the crop. Multi-season tape needs careful retrieval and storage out of sunlight.
Do I need a filter before the tape? Always. Use a 120 mesh screen filter for clean well water and a sand filter for pond or canal water. Emitters cannot be cleaned once blocked, so filtration protects the whole season’s investment.
Emitter position, wetted bulb and root zone in a mulched maize bed.
Next step
Send us your row spacing, field area, water source and target flow rate. Zhinongyun will return a tape specification, a roll count and a container loading plan within 24 hours — and we can quote the mulch film and fittings in the same document so the whole block ships together.
See the drip irrigation tape range for full specifications, or read the open-field vegetable programme if you are planning a mixed crop rotation.
Further reading on irrigation water management: FAO irrigation and drainage and USDA NRCS irrigation resources.