Mechanical weeding tools compared

Mechanical weeding is a method of eliminating weeds without using chemical products. There are several possibilities for mechanical weed control, so how do you choose between a row-crop cultivator, tine weeder, and rotary hoe? Check out our comparative and recommendations for choosing the right tool for you.

Mechanical weeding tools: three machines to reduce herbicide inputs

There are various tools possible for this technique, such as tine weeder, row-crop cultivator, and rotary hoe. By cutting and pulling up weeds on a plot, they boost crop growth without the use of herbicides.

Mechanical weeding is a technique that is commonly employed in organic farming. And with techniques becoming increasingly effective, it is gaining ground in conventional farming too, where it is used as a complement to chemical weed control.

Mechanical weeding is useful where chemical products show their limitations: weed resistance, active products being taken off the market, poor efficiency in dry periods, etc.

Faced with climate challenges and growing resistance, it is time to adopt a new approach to weed management.

Mechanical weeding benefits: a welcome addition in conventional cropping

Eliminates hardy weeds on the plot (when chemical solutions are inefficient, weed resistance)
Weather windows are different from spraying:
- No humidity restrictions
- No wind restrictions
- Daytime work, standard work times
Preserves moisture in the soil by stopping the rise of humidity through capillary action, and closing the cracks.
Improves growing conditions for crops (better tillering, aerates the soil, increases mineral content).

The limitations of the technique

Mechanical weeding is never 100% effective
Work output is slower than with chemical weeding
It is necessary to weed the plot regularly before the weeds grow too big
It is not very effective against perennial weeds
Crop damage is possible when non-selective weeding machines are used
Humus is lost if there are too many passes with the machine.

How to choose the right machine for your requirements

Choosing a mechanical weeding machine depends on the needs of the farm. There are various questions to consider before making a choice: soil type, crop type, stage of weed growth, technical-economic criteria, etc.

Take advantage of complementary products with KUHN’s three ranges of mechanical weed control solutions

A green tractor pulls a row crop cultivator Rowliner across a field with emerging green crop rows, working the soil between planted rows in a rural agricultural setting

ROWLINER row-crop cultivator

A tractor pulls red Kuhn rotary hoe Starliner across a green field, tilling soil in strips. The scene shows agricultural work under a clear blue sky with birds visible overhead.

STARLINER rotary hoe

A red tractor pulls Kuhn's tine weeder Tineliner across a green field with visible crop rows, surrounded by rolling hills and distant farmland under an overcast sky.

TINELINER tine weeder

Comparing the main mechanical weeding tools:

Selectiveness of weed control tools

Selective weeding (only works between the rows)	Non-selective weeding (works the whole surface area)
Row-crop cultivator	Rotary hoe	Tine weeder

Kuhn's row crop cultivator Rowliner with multiple rows of black tilling implements and yellow soil-working attachments spans horizontally across a white background.

Rotary hoe Starliner with black spring-loaded tines designed for mechanical weeding.

Kuhn Tineliner a large red agricultural tine weeder with multiple wheels and rows of curved metal tines, designed for weeding in farming operations.

How soil conditions affect performance

Comparison of tools and conditions
	Row-crop cultivator	Rotary hoe	Tine weeder
Climatic conditions	Requires well-drained soil and dry conditions to prevent weed regrowth
Soil preparation	Requires level, compacted soil without large clods	No specific requirements	Requires level, compacted soil without large clods
Plant debris	Little impact on effectiveness		«Rake» effect
Sloping fields	Risk of slippage of the row-crop cultivator	Little impact on effectiveness
Crusting	Tool capable of penetrating the soil crust (if shares are suitable)	Tool capable of penetrating the soil crust (crust removal function)	Tool not very effective on thick soil crust

How the stage of weed growth affects performance

Effectiveness of tools by weed stage
Weed stage	Germ	Coty	1 leaf	2 leaves	3 leaves	> 3 leaves
Row-crop cultivator	✅	✅	✅	✅	✅	✅🟠🔴
Tine weeder	✅	✅	✅	✅	🟠	🔴
Rotary hoe	✅	✅	✅	🟠	🟠	🔴

Effectiveness of tools by weed type
Weed type	Tine weeder	Rotary hoe	Row-crop cultivator
Annual dicotyledons	✅	✅	✅
Annual grasses	🟠	🟠	✅
Perennials	🔴	🔴	🔴

Legend:

✅ Effective under optimal conditions
🟠 Not very effective / possible slowdown in development
🔴 Ineffective

Selectiveness with respect to the crop

Comparison of tools and their requirements
	Tine weeder	Rotary hoe	Row-crop cultivator
Sowing density	Increase sowing densities to compensate for losses caused by the pass of the machine	No need to increase density	No need to increase density
Row spacing	No adaptation required	No adaptation required	Requires regular spacing, straight and adapted to the row-crop cultivator used
Target crops	All crops (however, be careful with sensitive crops)	All crops (however, be careful with sensitive crops)	Suitable for crops sown in wide rows
Need for a guidance system	Not needed	Not needed	Highly recommended
Pre-emergence weeding	No damage to crops	No damage to crops	Unsuitable
Post-emergence weeding	No damage to crops, but not very effective on developed weeds	No damage to crops, but not very effective on developed weeds	Little damage to crops
Late weeding	Unsuitable	Unsuitable	Little damage to crops up to row closure stage

Technical comparison of the tools

Work output by tool and conditions
	Working width (m)	Work output for 7 km/h in post-emergence (ha/h)	Work output for 15 km/h in post-emergence (ha/h)
Tine weeder	6	3,1	6,7
	9	4,7	10
	12	6,3	13,5
	Working width (m)	Work output for 15 km/h (ha/h)
Rotary hoe	6	6,75
	Number of rows	Work output for 8 km/h (ha/h)
Row-crop cultivator - narrow row (45–55 cm)	12	4
Row-crop cultivator - wide row (60–80 cm)	6	2,9
Row-crop cultivator - wide row (60–80 cm)	8	3,8

The key: flexibility!

Adapt weeding operations to the weather and weed situation:

Dry conditions + slight weed infestation > Opt for a MECHANICAL solution
Wet conditions + major weed infestation > Opt for a CHEMICAL solution, with a MECHANICAL complement

Adapt your strategy to each crop

Certain crops are more suited to mechanical weed control than others:

Spring crops are very well suited to mechanical weeding;
Rapeseed, sunflower, beetroot, and maize are sown with precision seed drills so are very well adapted to row-crop cultivation;
Chemical herbicides work better for delicate crops such as pea and winter cereals.

Agronomic strategies: Complementary and sustainable tools to reduce weeds in a crop

Controlling weeds better starts by preventing emergence.
A preventative agronomic approach (crop rotation, stale seeding, cover crops) is more profitable than systematic curative weed control.

Combining observation, agronomics, responsiveness, and the right equipment gives you the best chance of successful weed control.