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Chisel ploughs and deep rippers look like close cousins: both run rows of tynes through the soil, both fracture the ground rather than turning it over, and in the paddock they can be hard to tell apart. But they're built for different jobs at different depths, and using one where you need the other is money spent on the wrong problem.
The simplest way to keep them straight: a chisel plough works the seedbed zone, a deep ripper works below it. Same family of implement, different layer of soil.
The confusion is understandable. Both implements belong to the same broad family of tyned tillage: rigid or breakout-protected shanks pulled through the soil, fracturing it as they go, without inverting it the way a mouldboard or disc plough does. Both leave stubble largely on the surface compared to inversion tillage. And the word "ripping" gets used loosely in the paddock for any tyned pass, shallow or deep.
The difference isn't what the machines look like. It's the depth they work at, the constraint they're built to fix, and how often you run them.
A chisel plough is a primary tillage tool for the topsoil, typically working around 100 to 250 mm deep. Its jobs live in that zone: breaking surface crusts and shallow compaction, mixing stubble and residue through the seedbed, incorporating surface-applied lime or fertiliser into the topsoil, aerating the profile ahead of sowing, and mechanical weed control. It's an implement with deep roots in Australian cropping: DPIRD's review of tillage and stubble retention in WA cropping systems traces how the chisel plough was adapted for seed and fertiliser placement as reduced tillage practices developed, keeping it central to residue management long after herbicides replaced tillage as the main tool for weed control.
Because it's working shallow, a chisel plough runs more tynes at closer spacings and can be fitted with sweeps to work the full width of the topsoil rather than just slots. Draft requirements per tyne are modest, so it covers ground relatively quickly and can be pulled by mid-sized tractors at working widths that suit most mixed farms.
A deep ripper is a strategic tool for the subsoil. It targets constraints sitting below the seedbed: hardpans, traffic pans and compacted layers that roots and water can't get through. Typical working depths run from around 300 mm to 600 mm, with heavy-duty machines reaching 750 mm. GRDC groups deep ripping as its own category of strategic tillage, distinct from the mixing and inversion tools, precisely because its job is fracturing at depth rather than working the topsoil.
Ripping is not a routine annual pass. It's done occasionally, in response to a diagnosed compaction problem, and the benefit lasts until the soil re-compacts, often several seasons if traffic is managed afterwards. Shank spacings are wider, draft per shank is far higher, and the ground often benefits from a following roller to consolidate the loosened surface.
| Chisel plough | Deep ripper | |
|---|---|---|
| Working zone | Topsoil / seedbed | Subsoil |
| Typical depth | 100 to 250 mm | 300 to 600 mm (up to 750 mm on heavy-duty machines) |
| Main jobs | Seedbed prep, stubble mixing, incorporating lime and fertiliser, shallow compaction, weed control | Fracturing hardpans, traffic pans and compacted subsoil layers |
| Frequency | Routine, often annual | Strategic, occasional, in response to a diagnosed constraint |
| Tyne setup | More tynes, closer spacings, often with sweeps | Fewer shanks, wider spacings, points built for depth |
| Draft requirement | Moderate | High; increases sharply with depth |
| Follow-up | Usually straight to sowing | Often a roller pass to consolidate |
The answer sits in the ground, not the machinery catalogue. Dig a hole or run a penetrometer and find where the resistance actually is.
If the problem is in the top 200 mm or so, surface crusting, poorly mixed stubble, lime sitting on the surface doing nothing, shallow compaction from stock, that's chisel plough territory. If roots are stopping dead at 250 to 400 mm, water is perching after rain, or a penetrometer hits a wall below the seedbed, that's a subsoil pan and no amount of shallow tillage will touch it. You need a ripper working below the constraint, not on top of it.
Watching where crop roots stop is the cheapest diagnostic there is. Roots that spread sideways in a flat mat at a consistent depth are telling you exactly where the pan sits, and therefore how deep the ripper needs to work. For a fuller walk through preparation, timing and moisture, see our guide on things to consider when deep ripping.
Depth costs power. Draft load climbs sharply the deeper a tyne works, which is why a chisel plough pass covers hectares faster and cheaper than a ripping pass, and why deep rippers run fewer shanks at wider spacings for a given tractor. That economics is also why ripping is strategic rather than routine: you do it where a diagnosed pan justifies the fuel and time, then protect the investment by managing traffic afterwards so the loosened profile isn't compacted straight back down.
It works the other way too. Pulling a deep ripper at chisel-plough depth to do seedbed work is paying heavy-machine running costs for a light-machine job. Matching the tool to the job matters in both directions.
Often, yes, with the right setup. Because both implements are tyned and depth is adjustable, a well-built plough can do chisel-style topsoil work at shallow settings and ripping work at depth, provided the frame and shanks are strong enough for the deep end of that range. The limiting factor is almost always strength: a machine built only for seedbed work will break out or ride up when asked to punch through a pan.
That flexibility is central to how the Agrowplow range is designed. Our deep tillage ploughs run shank and blade options that suit both ends of the job: sweeps for greater topsoil lifting and mixing at shallower settings, and hardened points for ripping at full depth, on frames and breakout systems built for the deep end. The right configuration depends on your soils and the mix of jobs you need one machine to cover, so talk to your dealer about shank options before deciding.
And if your subsoil constraint is a clay layer rather than a simple pan, the comparison you want is a different one: read our guide on delving vs deep ripping.
Contact us to talk through the right machine and configuration for your country, or find your local Agrowplow dealer.
