Arable stubble incorporation calls for a cultivator that can bury crop residue in a single pass without hair-pinning trash into the seedbed, and a rotary hoe is the standard tool NZ growers reach for on wheat, barley and maize ground after harvest. Paddock size, stubble load and soil moisture at the time of cultivation change which working width and drive type actually get the job done before the next planting window closes.
- Sierra Rotary Hoe 73 (1.85m) is the pick for arable stubble incorporation on 40-90hp tractors in 2026.
- Rip compacted ground with the Novaquip Single Tine Ripper before hoeing if the paddock has a hard-pan layer.
- Gear-drive rotary hoes handle heavier maize stubble with less downtime than chain-drive units.
- Match hoe width to paddock size, not just tractor horsepower, to keep passes-per-hectare down.
Why cultivator choice matters for arable stubble incorporation
Stubble incorporation on an arable block is a timing problem as much as a tillage problem. Between harvest and the next planting date, growers usually have a narrow window to bury residue, let it start breaking down, and get a seedbed ready β and a cultivator that's too narrow or underpowered for the paddock turns a two-day job into a week.
Heavy trash from maize or a high-yielding wheat crop behaves differently to light barley stubble: it wraps around slower-turning rotors, resists burial in shallow passes, and can force a second pass that most arable operations don't have time for. The right cultivator for stubble incorporation is chosen against your heaviest stubble load, not your average one.
Assess your stubble length and residue load first
Before picking a machine, work out what you're actually cultivating into. This step costs nothing and determines everything downstream.
- Walk the paddock and note stubble height and density after the header, not from memory
- Identify crop type β maize and heavy wheat stubble need more aggressive rotor action than barley or oat stubble
- Check soil moisture; hoeing wet ground smears rather than incorporates and can set you back a fortnight
- Note any hard-pan or wheel-track compaction from harvest traffic
- Decide whether the block needs one pass or a rip-then-hoe combination
Match tractor power and linkage to the job
A cultivator is only as good as the tractor pulling it. Arable operations in NZ typically run 40-90hp tractors for this class of work, and the PTO and three-point linkage need to suit the implement, not the other way round.
- Confirm PTO speed (540 or 1000) matches the rotary hoe's gearbox rating
- Check three-point linkage category matches your tractor's pin size before ordering
- Add front ballast on lighter tractors running wider hoes to keep steering weight on the front axle
- Confirm hydraulic flow is adequate if the hoe uses a hydraulic depth or side-shift function
- Walk the linkage geometry so the hoe sits level front-to-back at working depth
Choose a rotary hoe width for your paddock size
This is where the machine choice actually happens, and it's where most growers either overspend on width they don't need or underbuy and end up doing extra passes.
The Sierra Rotary Hoe 73 (1.85m) is built for arable blocks running 60-90hp tractors and covers ground fast enough to keep pace with a normal post-harvest window in 2026. It's gear-driven rather than chain-driven, which matters directly for stubble incorporation because gear drives hold up better under sustained heavy-trash loads without the chain stretch and tensioning maintenance that chain-drive units need mid-season.
Smaller arable blocks or growers running a compact tractor under 40hp are better matched to a narrower option like the Sierra 40 Gear Drive Rotary Hoe, which trades working width for lower power demand and easier manoeuvring on smaller or oddly shaped paddocks. A 1.4m Sierra Rotary Hoe sits between the two on width and suits mid-size blocks where a 1.85m machine would be overkill for the tractor on hand.
Rip compacted ground before hoeing if needed
If harvest traffic left wheel-track compaction or the paddock has a natural hard-pan, hoeing alone won't fix it β the rotor works the topsoil, not the compacted layer underneath.
- Test for hard-pan with a spade or penetrometer along wheel tracks and headlands
- Run a single-tine ripper through compacted zones ahead of the hoe pass
- Time ripping for drier soil conditions to get a clean shatter rather than smearing
- Don't rip the whole paddock if compaction is isolated to tramlines β target the pass
- Follow ripping with the rotary hoe in the same operation where soil conditions allow
The Novaquip Single Tine Ripper handles this job on tractors already set up for three-point linkage work, and running it ahead of the rotary hoe on compacted sections avoids buying a second dedicated subsoiler for what's usually a targeted problem, not a whole-paddock one.
Set rotor speed and depth for full residue burial
Getting depth and speed wrong is the single biggest cause of poor stubble incorporation β either the residue stays on the surface or the rotor overworks the soil into a fine, structureless layer.
- Set working depth deep enough to fully bury stubble, not just chop it
- Slow forward speed on heavy trash rather than raising rotor RPM to compensate
- Check burial after the first few metres and adjust before committing the whole paddock
- Avoid hoeing the same depth every pass β vary slightly to reduce plough-pan style compaction at a fixed depth
- Match rotor direction (standard or reverse) to whether you're incorporating or leaving a rougher finish for erosion control
Finish with a second pass or a chain harrow if the seedbed needs levelling
On heavier stubble loads, one hoe pass buries residue but leaves a rough finish. A light second pass, or a chain harrow behind the hoe, levels the seedbed without another full cultivation.
- Run the chain harrow only after residue is fully buried, not as a substitute for burial
- Use a lighter, faster pass rather than a second deep hoe run where possible
- Check for clod size before drilling β oversized clods slow germination on cool arable soils
- Time the finishing pass close to drilling to avoid moisture loss on exposed ground
Cultivation toolbars that carry extra tine sets can extend what a single hoe pass achieves on mixed-condition paddocks β the setup principles are covered in toolbars for mounting cultivation tines for growers running compact tractors alongside larger arable gear.
Find the right cultivator for your block
Browse rotary hoes and tillage attachments built for NZ arable ground.
Comparison: cultivator options for stubble incorporation
| Option | Best for | Key limitation |
|---|---|---|
| Sierra Rotary Hoe 73 (1.85m) | 60-90hp tractors covering large arable blocks | Needs adequate PTO power and front ballast on lighter tractors |
| Sierra Rotary Hoe 56 (1.4m) | Mid-size blocks and mid-power tractors | Slower coverage than the 1.85m unit on big paddocks |
| Sierra 40 Gear Drive Rotary Hoe | Compact tractors under 40hp, smaller blocks | Narrower width means more passes on large-scale arable ground |
| Novaquip Single Tine Ripper | Breaking hard-pan or wheel-track compaction ahead of hoeing | Not a substitute for a rotary hoe β targets compaction, not residue burial |
The Sierra Rotary Hoe 73 (1.85m) is the strongest all-round cultivator for stubble incorporation on NZ arable blocks in 2026, provided the tractor has the power to run it at a steady pace through heavy trash.
Common mistakes arable growers make with stubble incorporation
- Buying width before checking tractor power β a 1.85m hoe on an underpowered tractor bogs down in heavy maize stubble and does a worse job than a narrower, well-matched unit
- Skipping the compaction check β hoeing over wheel-track hard-pan buries residue on top of a layer that still restricts root growth
- Running rotor speed too high on wet ground β this smears rather than incorporates and can delay drilling by weeks
- Treating chain-drive and gear-drive hoes as interchangeable β chain-drive units need more mid-season maintenance under sustained heavy-trash loads
- Ignoring stubble type differences β barley stubble incorporates in one pass where maize stubble routinely needs a slower pass or a rip-and-hoe combination
FAQ
What's the best cultivator for stubble incorporation in NZ?
A gear-drive rotary hoe sized to your tractor is the standard choice for NZ arable stubble incorporation in 2026, with the Sierra Rotary Hoe 73 (1.85m) suiting 60-90hp tractors on larger blocks. Smaller blocks are better matched to a narrower unit like the Sierra 40 Gear Drive Rotary Hoe.
Is a rotary hoe better than a plough for stubble incorporation?
A rotary hoe incorporates stubble in a single pass and leaves a finer, more workable seedbed than a plough, which inverts soil but leaves larger clods. Ploughing suits deeper residue burial where surface trash is very heavy, but most arable stubble incorporation in NZ runs on rotary hoes for speed.
How much tractor power do I need for stubble incorporation?
Most arable rotary hoe work in NZ runs on 40-90hp tractors, with wider hoes needing the higher end of that range to maintain forward speed through heavy trash. Matching PTO speed and linkage category to the hoe matters as much as raw horsepower.
Can a rotary hoe handle heavy maize stubble?
Yes, but heavy maize stubble needs a slower forward speed and sometimes a rip-then-hoe combination rather than a single fast pass. A gear-drive rotary hoe like the Sierra Rotary Hoe 73 handles sustained heavy-trash loads better than a chain-drive equivalent.
Do I need to rip before hoeing stubble ground?
Only where wheel-track compaction or hard-pan is present β a single-tine ripper run through those zones ahead of the rotary hoe fixes the compaction that hoeing alone can't reach. Ripping the whole paddock when compaction is isolated wastes a pass.
What PTO speed do rotary hoes run at?
Rotary hoes are built for either 540 or 1000 PTO speed depending on the gearbox, and running the wrong speed strains the drivetrain and reduces rotor performance. Confirm your tractor's PTO speed matches the hoe's rated speed before buying.
How wide a rotary hoe do I need for a 40ha arable block?
A 40ha block on a 60-90hp tractor is typically well matched to a 1.85m rotary hoe, since narrower units mean significantly more passes to cover the same area within a tight post-harvest window. Smaller or split-power tractors may still be better served by a narrower hoe run at a steadier pace.
How deep should a cultivator run for stubble incorporation?
Depth should be set deep enough to fully bury the stubble load rather than just chop it, and checked on the first few metres of each paddock before committing. Heavier trash generally needs a deeper setting and slower forward speed than light stubble.
One last thing
Gear-drive rotary hoes cost more upfront than chain-drive equivalents, but on arable blocks running heavy maize or wheat stubble year after year, the reduced mid-season maintenance on the gearbox is the difference that actually matters β chain tensioning and replacement under sustained heavy-trash loads adds up fast across a full 2026 season.