Trailed GD Drill
The GD drill is the outcome of continuous refinement and development, to create a simple yet precise seed drill. It features the patented and future proofed GD coulter, which provides remarkably low soil disturbance, has a very low draught requirement along with an excellent service life. The GD drill excels in its adaptability to satisfy all drilling systems, soil types and conditions. This provides users with the flexibility to approach zero-till alongside traditional crop establishment methods. Trailed models are available in 3 to 8 Metre working widths helping to satisfy the demands of large farmers and contractors. The 5,000 Litre hopper (4,000L for the GD3001T) users ample volume whilst being fitted with an easily accessible volumetric metering unit accompanied by RDS iSOCAN controls. The tank can be configured to include an integral micro granular hopper. A closed hydraulic suspension system provides individual coulter pressure of up to 300Kg helping to maintain consistent sowing depth across undulations. Fitted with a Cat III linkage mounted drawbar allowing for tight headland manoeuvres. The hydraulic folding coulter bar maintains transport widths of under 3 metres on all models.
HOW THE COULTER WORKS
The principal behind the GD coulter design is based on a double disc arrangement, mounted on a 22° angle off the vertical which is able to pivot around a central kingpin mounted within the coulter body. The larger leading outer disc cuts an opening slice in the soil whilst the smaller inner disc is in effect undermining the ‘upper’ side forming an opening for the seed to be placed precisely. This process removes side wall compression from the opening slot, making slot closing more effective and consistent. The lifted wall of the soil is firmed down onto the seed by a single press wheel ensuring good seed to soil contact. The press wheel also acts as a depth regulator for the disc coulters. Drilling depth is adjusted by moving a single pin through a bank of holes with a depth range of 16-144mm in 16mm increments. Coulters are individually pressurised by a hydraulic system providing up to 200kg of downwards pressure helping to maintain consistent contact with the ground and follow contours and undulations. This refined design aided by an inter-row clearance of 1 metre has resulted in a coulter that is able to work in extremely trashy conditions and cover crops minimising the opportunity for hair-pinning to arise.
5,000L hopper (4,000L for the GD3001T), RDS iSOCAN controls with GPS forward speed monitoring, hydraulic fan & oil cooler, a 2-row coulter bar with a row spacing of 166mm, roll over hopper cover, CAT III Scharmüller hitch, Mitas floatation tyres, stone guards, stainless steel scrapers, work, tank & road lights, and a tank sieve.
The Grain & Fertiliser models are equipped with the same standard features as their grain only counterparts, but the tank has a 60/40 split. Individual metering units supply different products to the coulter where they are mixed in the seed tube as it enters the ground.
*GD3001T comes with a 4,000 litre Grain & Fertiliser split hopper as standard and the GD8001T is only available as a grain only model.
Includes 1 year warranty
The GD coulter can accurately place a wide variety of seed types and sizes whilst maintaining a consistent depth. Seed is delivered between the two discs of the coulter directly to the bottom of the soil opening. The disc coulter units of the GD Drill are independently mounted and hydraulically pressurised, allowing each coulter to maintain consistent contact with the ground. Contours, obstacles, and undulations are no challenge for accurate seed placement. A rubber exhaust boot at the top of the coulter diffuses 50% of the air allowing controlled seed delivery to the soil and preventing seed bounce.
The GD coulter offers superior soil disturbance control compared to other no-till drills on the market. The coulter eliminates the opportunity for fresh soil to be brought to the surface whilst the surface layer is left intact and therefore prevents fresh and dormant weed seeds from germinating. The leading outer disc cuts through the soil whilst the smaller inner disc undermines the soil structure creating an opening for the seed to be placed, before swiftly being firmed back to its original state.
Calibration is simple and quick using the single point discharge chute and screw adjustable Weaving volumetric metering unit. The corrosion-proof metering unit is maintenance free and will maintain its accuracy season after season. Complete discharge of the hopper is made quick and easy with the emptying hatch. The trailed GD is a two-piece toolbar fold (excluding GD3001T & GD8001T models), this makes access to the metering unit virtually unhindered and calibration fuss free.
Hydraulic Fan Drive
The GD Drill is fitted with a hydraulic fan drive. This reduces the RPM on the tractor, which in turn reduces fuel costs, gives more flexibility with air flow, and helps prevent wear and tear.
RDS iSOCAN Controls
The Trailed GD Drill is equipped with RDS iSOCAN controls. The terminal from RDS uses a 7″ touchscreen (16 x 9 format) display and includes physical keys to provide a modern and ergonomic operator interface for a wide variety of applications. The system allows up to 4 metering units or applicators, enabling dual cropping, fertiliser and Avadex applications. The iSOCAN software monitors and controls tramlining, hopper level, fan speed alarms, variable rate controls, on the move seed rate adjustment and offers activity data (e.g., area worked and quantities applied). The iSOCAN software is ISOBUS compatible, allowing complete control via ISOBUS with the addition of an ISOBUS ready cable (see optional specification).
3m Trailed GD
The trailed GD is available as a 3m machine. This is grain & fertiliser specification however both metering units can apply seed only if required. Based on a smaller and more compact frame, the hopper is also slightly smaller at 4000L. The rest of the drill features the same specification as the other larger trailed GD models.
Product Title Prices
Select from the options below to add them to the final price
A serrated cutting disc to mark the surface of the soil allowing operators to align the centre of the machine at equal and parallel distances from their previous workings.
Avadex Applicator (240L)
The Stocks Turbo Jet applicator with a capacity of 240 litres is a versatile and accurate 12 volt powered pneumatic applicator to meter and spread most small seeds. This applicator is commonly used to apply avadex or slug pellets with the measured material blown onto the seedbed surface via a separate distribution unit. Applicators can be configured to suit various working widths.
OSR/Slug/Fert Applicator (130L)
The Stocks Rotor Meter applicator has a capacity of 130 litres enabling it to accurately and safely meters micro and full size granular material and small seeds. The electronically speed controlled (ESC) applicator uses GPS to automatically maintain application rate as forward speed varies with ‘on the go’ rate adjustment. The metered material is fed into the venturi of the seed metering unit via a pressurised air supply ensuring constant delivery of material. The combination of materials is evenly mixed in the metering unit and delivered via each coulter into the seedbed.
iSOBUS Ready Cable
iSOBUS enables standardised communication between your tractor, software and drill through a single ‘plug and play’ terminal. The tractor driver is able to control multiple functions allowing better yield and precision drilling management from the comfort of the tractor cab using an iSOBUS Ready Cable.
Variable Rate Unlock Code
This is only available with iSOCAN controls. By purchasing the unlock code, operators are then able to access the variable rate seeding facility on the RDS controller.
Fitted to the wheel arm these scrapers help to knock off excess soil that may carry on the tyre in damp conditions allowing users to continue operating for longer. (Price per scraper)
Electric Half Shut Off
An electronically controlled actuator shuts off 50% of the distribution head cutting off seed supply to half of the machine width which allows for symmetrical tramlining.
Please select your terms and repayment length to provide a representative finance quote for your purchase. Please note these are indicative figures and do not include any applicable delivery charges. Bespoke finance quotes are available to suit your budget, please ask our sales team for more information.
|Working width (m)||4||4.8||6||8||3|
|Hourly output (ha)||4||5||7||9||3|
|Row spacing (mm)||166||166||166||166||166|
|Minimum coulter pressure (kg)||300||275||240||202||250|
|No. of coulters||24||28||36||48||18|
|Minimum power requirement (hp)||140||160||180||240||115|
|Working speed (km)||8-12||8-12||8-12||8-12||8-12|
|Road transport width (m)||2.99||2.99||2.99||2.99||2.99|
|Weight - Grain Only (kg)||7400||7800||8300||9700||N/A|
|Weight - Grain & Fertiliser (kg)||7700||8000||8700||N/A||4550|
|Hopper capacity (l)||5000||5000||5000||5000||4000|
|Transport wheel size||800 / 45R26.5||800 / 45R26.5||800 / 45R26.5||800 / 45R26.5||800 / 45R26.5|
|Disc Diameter Ø (mm)||405||405||405||405||405|
|Press wheel||4.00-8 6 ply Kevlar belt||4.00-8 6 ply Kevlar belt||4.00-8 6 ply Kevlar belt||4.00-8 6 ply Kevlar belt||4.00-8 6 ply Kevlar belt|
|Hydraulic spool requirement||4 double acting + 1 single acting + free flow return||4 double acting + 1 single acting + free flow return||4 double acting + 1 single acting + free flow return||4 double acting + 1 single acting + free flow return||4 double acting + 1 single acting + free flow return|
|Fan oil capacity (l/min)||45||45||45||45||45|
Ed Reynolds, R I Reynolds & Son, Cambridgeshire
The GD does what every direct drill should do – it closes the slot in a variety of situations. By covering the seed, it increases germination rates and protects from slugs and chemical damage. The openers also follow the ground contours well. It can cope with high residue situations and tall cover crops. The only problem we encountered was drilling into thick mats of cereal straw on the ground. We modified our practice and cut our stubble much higher, which dramatically improved the problem.
Over the last 4 years of running our GD, we are impressed with the build quality and reliability. This drill has allowed us to transition from conventional tillage to regenerative agriculture, incorporating cover crops, broadening our rotation and practicing no-till successfully. We use our drill twice per year on most fields, to establish cash crops and cover crops. The multi-hopper configuration (including the small seed hopper) makes it versatile. I also think the ability to place fertiliser next to the seed in our first years transitioning to no-till was important.
Ed Reynolds, R I Reynolds & Son, Cambridgeshire
Tim Smith, Smith Farms, Somerset
I have been running a trailed Weaving GD on our 550-acre medium to heavy beef and arable farm for nearly 3 years moving on from a strip-till drill. My focus is to be predominantly zero till, but with the flexibility to carry out low disturbance subsoiling, mole draining or light discing where necessary and still follow with the GD.
The main reason I chose the GD was that it ticked all of the boxes in terms of a 3-metre trailed machine with all the capabilities of a larger model such as dual hoppers, total integration of Avadex/slug pellets etc and arrived ready to go without any further modification. I also liked the angled slot closure as it has meant the seed is always covered under a shelf even in drying ground conditions. It also felt reassuring to buy a product from a family-owned British company with hundreds of units successfully on the ground already.
We are currently 50% zero-till, with the other 50% aimed towards zero-till next year after a reset, with focus on maintaining soil health to reduce or eliminate mechanical intervention where we can in the future.
The main benefits from using the GD and direct drilling include; reduced blackgrass (through low disturbance but also better results from pre-ems), more consistent spring cropping (through better moisture retention), more forgiving ground conditions meaning we can travel when we could not before and fuel and time savings (from running just 1 machine through the ground). In the event of crop failure, there are still roots and residue from the previous crop untouched in the ground rather than leaving bare soil. With the GD we have the ability to plant a high biomass winter cover crop and drill spring crops straight into it successfully.
Wisdoms we have gathered so far and would share with other perspective operators would be; start with crops and varieties that have good vigour and are known to suit zero-till, variable seed rate drilling is especially helpful, don’t be afraid of using slug pellets pre or post where necessary, ensure compaction, drainage issues etc are sorted before fully committing to zero-till and finally, the way the land is treated throughout the year will affect how successful the next crop is.
Tim Smith, Smith Farms, Somerset
Tom Jewers, D & T Farms Ltd, Bury St Edmunds
We purchased a 4.8m trailed Weaving GD drill in Spring 2016. The farm had been transitioning to no tillage over the previous 5 years as we had taken the decision to reduce the amount of steel we were wearing up and fuel we were burning in order to turn our Hanslope clay soils into a seedbed.
When it came to the drill purchase we had decided to go for a disc drill for 2 reasons; firstly our goal was to reduce grass weed germination at the point of drilling, so we wanted to be as low disturbance as possible, and secondly, our soils remain quite wet in the spring, and we considered a tine drill would pull up “puggy” wet clay in the spring, and potentially have an issue with trash from cover crops in spring. Having now run the drill over a variety of conditions in both spring and autumn we are sure we made the right decision.
The trailed GD has plenty of downforce to cut seed into the soil in very dry conditions, but most importantly for us, can close the slot in very wet conditions - Autumns of 2019 and 2020 really tested that! We have seen huge transformation to the condition of our soils over the past 5 years. It took a couple of years before we started to notice changes other than the immediate increase in worm numbers, but as an example, for the first 3 years we found 2nd cereals challenging with chopped straw locking up nutrition. The biology seems to now cycle chopped wheat straw much quicker and 2nd wheats are now no problem to direct drill and have been yielding better than ever. Barley is a little less forgiving after chopped spring barley, but this year for the first time we have direct drilled all the winter barley into chopped straw and it looks great. Importantly the GD will also work in a cultivated system which means we can still remain flexible with contract customers, and don't need another drill in the back of the shed.
Tom Jewers, D & T Farms Ltd, Bury St Edmunds