Coulters | Harrows

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The high performance seed drill – especially for low rainfall regions and large acreages

The parallelogram guided sowing openers of the AMAZONE Primera DMC with their ‘on-grip’ DURA chisel tips ensure a clean seed furrow for better soil contact and the most accurate maintenance of the placement depth. The following double roller provides good re-coverage of the seed furrow. Optimum seed/soil contact and accurate sowing depth are preconditions for uniform crop establishment. The REVOMAT overload safety device ensures a damage-free sowing operation even in stony soils. Seed coverage is optimised by the hoop ring rollers and the Exact following harrow or the Roller exact harrow. The combined application of seed and fertiliser is available as an option. Under some conditions the plough still cannot be completely abandoned but even under this conventional cultivation regime and after a secondary seedbed preparation the Primera DMC can be used as effectively. Advantages of the Primera DMC: • Profitable crop production in times of increasing production costs and changing farm sizes • Fulfils all environmental considerations and reduces nitrate leaching • Reduces machinery and operating costs • Conservation and soil saving cultivation system • Reduces soil erosion • Reduces soil water losses • Stabilises soil structure • Higher straw degradation and drainage ability

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Coulter arrangement

The coulters are arranged, in four rows with a row spacing of 18.75 cm, in such a way, that diagonally, “tip to tip”, distances of approx. 75 cm exist between coulters. This principle allows a relatively narrow row spacing (18.75 cm) for the quick coverage of the crop (a full canopy) and at the same time reduces the danger of blockage by any large volumes of straw.

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Parallelogram suspension of the chisel openers

All the chisel openers are suspended on parallelogram linkages. Of course this is relatively complex but ensures, in varying or changing (uphill – downhill, on the headland, under different soil consolidations, etc.) forward speeds, and in addition any soil undulations, that the desired sowing depth is being maintained.

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REVOMAT overload safety device

If the chisel opener hits an obstacle, e.g. heavy stones or compacted headlands, the upper link abruptly gives way at an exactly pre-set pressure. The coulter jumps upwards and immediately returns into the work position. Automatically, super! With obstacles that are just hit on the angle in the direction of travel, the coulter just moves to the side – because the entire lower link is not rigid but a one-piece long spring plate. Also again automatic, super. (1) Top link straight chisel opener in operational position (2) Top link cranked chisel opener “deflected” after hitting an obstacle in the soil

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AMAZONE DURA chisel tip

The coulter tip or the “chisel” is protected against wear using a tungsten carbide metal plate – meaning this coulter tip lasts for eternity, well many thousands of hectares at least! This is yet another AMAZONE invention which is often “imitated”. It is easily recognisable: the AMAZONE chisel opener is the result of years of experience and is simply very, very good.

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Hoop ring rollers on every coulter

AMAZONE moved a huge step forward with the so-called hoop ring rollers on every coulter mounted in pairs on either side of the seed furrow created by the chisel. In this way, every coulter is individually and reliably guided at its preset sowing depth and, in addition, the individual seed furrow is always absolutely closed, again and again, with loose soil, even with very moist soils or wet patches. And all this even at forward speeds of up to 18 km/h. That means: how much or how little soil is thrown to the side by the chisel opener “driving” through the soil – the two round discs deflect this soil again over the seed furrow. In addition a slight pressure from both sides is applied and a slight pressurising by the exact harrow or the roller exact harrow. In this way the seed is properly covered and the surface above the seed grains is maintained a little open – relatively loose and this allows – a quicker soil warming around the seed. This, however, only works properly if the entire seed is delivered to the moist bottom of the furrow. This functions on the chisel openers due to the long-travel, precise seed guidance system located very close behind the chisel opener. The hoop ring roller consists of the Reflex discs with the hoops serving as the supporting elements. It is wear-resistant and is cast from one piece. The hoop rings fitted to the outer side of the reflex discs, which is made from thin material always guide both the chisel opener and also the Reflex discs at the desired depth – irrespective of their forward speed! Due to their especially narrow shape no bulldozing is created, even in moist soil – so that the machine can be still be utilised even when the soil is still very wet. And all this without scrapers, which, as everyone knows, tend to carry along a mixture of straw and soil, resulting in a significant braking effect and the relevant wear. The sowing depth is easily adjusted in groups via crank handles mounted centrally on each coulter module – very simple and quick.

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Seed coverage with the Exact harrow

The Exact harrow levels the soil surface, working blockage-free, even where there are large quantities of straw. The individually-pivoting, harrow elements follow the ground contours, creating a uniform seed covering, straw-free, even in areas where copious amounts of straw prevail.

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Additional consolidation with the Roller exact harrow

The press rollers on the Roller exact harrow give additional consolidation to the ground directly above the seed furrows. This is especially recommended for light, dry soils when sowing spring crops or rape. The AMAZONE Roller bar can be quickly raised out of work and locked. Attention: in moist & sticky soil conditions, practitioners recommend for today’s seed drills that use pressure or guide rollers, to isolate these rollers, to dismount them or to lock them in raised condition (out of work). This is only possible, however, if it is not also providing the depth control. This is the crucial disadvantage of other systems, but with AMAZONE this problem is well solved!

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An even field is left

After the pass, the Primera DMC openers leave an even finish (no grooves or ridges), resulting in, apart from an even field emergence, also practical driving advantages – e.g. for a smooth ride of the combine, the crop protection sprayer (no boom bounce!) and the fertiliser spreader. This applies in particular also to both field ends of the headland.

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Related links

Here you will find further information on seeding technology

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