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Disc Seed Drills

The Aitchison® 4000 Series Seedmatic® Disc Drills are backed by over 50 years of trusted Aitchison® seeding innovation, and are built to deliver reliable, high-performance results across a wide range of conditions.

These zero-tillage drills are ideal for sowing into existing pasture, cultivated ground, rocky soils, or heavy stubble such as maize. The infinitely variable gearbox handles most seed volumes and sizes effortlessly, so whether you’re renovating paddocks, bulking up pasture, or establishing crops like clover, wheat, peas or canola, the Seedmatic® range gets the job done—consistently and efficiently. Models are available with or without fertiliser boxes, including the 4100 Series for those requiring integrated seed and fertiliser placement.

With tight 125mm (5”) row spacing and a 400mm stagger between rows, Seedmatic® disc drills are engineered for superior trash clearance and uniform emergence—helping you maximise yield while maintaining soil health.

The Disc System

  • Slices Through Residue and Penetrates Stubble
  • Pushes Aside/rides Over Stones
  • Cuts Precise Furrows with Minimal Soil Disturbance
  • Improves Moisture Retention and Seedbed Consistency

These features help reduce erosion, maintain consistent seeding depth, and deliver better crop establishment in challenging paddocks. Ideal for contractors and farmers needing a low-maintenance, high-performance machine across multiple terrain types.

Not sure if a Disc Drill is the right one for your farm?
Our Product Specialists will help you identify a model that suits your budget and requirements.
Talk to our team

Disc Drill Features

  • Large 406mm / 16” concave discs as a standard feature
  • Seedmatic® Disc Drills are ideal for matted pasture renovation.
  • Rodent stop slide mechanism on all models.
  • Individually sprung discs give superior contour following.
  • The Unique Aitchison sponge seed distribution system is gentle and accurate.
  • Aitchison seeding mechanism provides effortless access for cleaning after use.
  • Infinitely variable gearbox handles all seed volumes and sizes effortlessly.
  • All Aitchison Seedmatic® drills provide excellent germination.
  • Calibration and changing from large to small seeds is straightforward
  • Large tread board and safety rails included as standard features.
  • 125 mm / 5″ row spacing for optimal results.
  • Stainless steel fertiliser pipes (Fert Models only)

Take A Closer Look

Large 14” concave discs as standard.

Optional Transport Kit.

125mm / 5” row spacing creates optimal results.

Seedmatic® disc models are ideal for matted pasture renovation.

Adjustable Disc Height

Large tread board and safety rails as standard features.

All Aitchison Seed Drills are 100% NZ Made.

Individually sprung discs give superior contour following.

All Aitchison Seedmatic® drills provide excellent germination.

Rodent stop slide mechanism on all models.

The Unique Aitchison sponge seed distribution system is gentle and accurate.

    The Sponge Pad System

    The Aitchison® seed distribution system, featured on both the Grassfarmer® and Seedmatic®, is a truly unique innovation that has stood the test of time. At its core is a specially designed sponge pad that delivers exceptional accuracy while being gentle on all product types—handling a wide range of seed sizes and volumes with ease, including selected fertilisers.

    Paired with an infinitely variable gearbox, the system allows for precise sowing rates—from as little as 1kg/ha up to 350kg/ha—ensuring the right output for any job, whether you’re sowing fine or heavier product mixes.

    NZ Made icon highlighting that Aitchison seed drills are proudly manufactured in New Zealand

    The C-Slot (Disc Method)

    Disc seed drills are the go-to choice for farmers working in rocky, compacted, or residue-heavy soils where tine drills may struggle. With minimal soil disturbance and precise placement, they deliver clean, consistent results—especially in challenging conditions like Kikuyu pasture or hard summer ground.

    Ideal for direct drilling into existing swards or trash-covered paddocks, Aitchison Disc Drills deliver consistent seed depth and placement across all terrain types. Each model is fitted with a heavy-duty concave single disc opener that’s staggered for efficient trash flow (406mm / 16” on Seedmatic® models). These units retain moisture, protect soil structure, and enable faster ground speeds—making them a smart choice for conservation farming or variable conditions.

    C-slot disc drill diagram showing how Aitchison GrassFarmer disc openers create clean furrows and precise seed placement in no-till conditions with high residue.

    Disc depth is easily adjustable via mechanical or optional hydraulic control, giving operators flexibility to adapt on the go. Low maintenance and highly effective, Aitchison disc drills are built to perform season after season.

    Seedmatic® Disc Drill Specifications

    Finding the right seed drill isn’t always simple.
    They vary in price, functionality, size and upkeep – Contact us and we’ll help you identify the right model for your requirements.
    Talk to our team
    SPECIFICATIONS
    SEED ONLY MODELS    		 4020D
    Disc    		 4020DT
    Disc + Trailing Kit    		 4024DT
    Disc + Trailing Kit    		 4028DT
    Disc + Trailing Kit
    Overall Width 3.2 m (10’ 5’’) 3.2 m (10’ 5’’) 3.7 m (12’ 1’’) 4.2 m (13’ 8’’)
    Sowing Width 2.50 m (8’ 2”) 2.50 m (8’ 2”) 3.0 m (9’ 8”) 3.50 m (11’ 5”)
    Overall Height 1.8 m (5’ 11”) 1.8 m (5’ 11”) 1.8 m (5’ 11”) 1.8 m (5’ 11”)
    Weight Empty 1220 kg / 2689 lb 1510 kg / 3462 lb 1420 kg / 3130 lb 1985 kg / 4376 lb
    Seed Hopper Capacity 625 lt (17.7 bu) 625 lt (17.7 bu) 780 lt (22.1 bu) 875 lt (24.8 bu)
    Number of Rows 20 20 24 28
    Row Spacing 125mm (5’’) 125mm (5’’) 125mm (5’’) 125mm (5’’)
    Transport Kit (T) - Yes Yes Yes
    Tow Hitch - (Standard with Transport Kit Only) (Standard with Transport Kit Only) (Standard with Transport Kit Only)
    SPECIFICATIONS
    SEED & FERTILIZER MODELS    		 4120D
    Disc    		 4120DT
    Disc + Trailing Kit    		 4124DT
    Disc + Trailing Kit    		 4128DT
    Disc + Trailing Kit
    Overall Width 3.2 m (10’ 5’’) 3.2 m (10’ 5’’) 3.7 m (12’ 1’’) 4.2 m (13’ 8’’)
    Sowing Width 2.50 m (8’ 2”) 2.50 m (8’ 2”) 3.0 m (9’ 8”) 3.50 m (11’ 5”)
    Overall Height 1.81 m (5’ 11”) 1.81 m (5’ 11”) 1.81 m (5’ 11”) 1.81 m (5’ 11”)
    Weight Empty 1350 kg / 2976 lb 1640 kg / 3616 lb 1840 kg / 4056 lb 2405 kg / 5303 lb
    Seed Hopper Capacity 450 lt (12.7 bu) 450 lt (12.7 bu) 540 lt (15.3 bu) 630 lt (17.8 bu)
    Fertiliser Box Capacity 450 lt (12.7 bu) 450 lt (12.7 bu) 540 lt (15.3 bu) 630 lt (17.8 bu)
    Number of Rows 20 20 24 28
    Row Spacing 125mm (5’’) 125mm (5’’) 125mm (5’’) 125mm (5’’)
    Transport Kit (T) - Yes Yes Yes
    Tow Hitch - (Standard with Transport Kit Only) (Standard with Transport Kit Only) (Standard with Transport Kit Only)

    Upgrade Options

    Part Name Part Number
    LED Transport Light Kit A2590-ASSY
    Parallelogram Rear Drawbar Tongue Assy. A2527-ASSY
    Rear Remotes ASM-RR-ASSY
    Hydraulic Ram Disc Coulter Kit A2429
    Hydraulic Ram for Front Drawbar A3129
    Area/Hectare Meter A2389A
    Upgrade Fertiliser Box To Seed Box A3170
    Digital Weight Scales TB403
    Swivel Tow Hitch In Lieu Of Ball Tow Hitch -
    Aitchison Bait-It Applicator (75 Litre | 12V) AZS75