GB Group English Machines Services Media - Marketing Contact TETRA Seed-Bed Preparators Configure your Tetra Easy to use and low maintenance for perfect germination. Watch the second video Walkaround Seed bed preparation for seed sizes from beet to field beans To ensure optimal germination, Tetra offers you the ideal soil tillage for soil-seed contact. Seedbed preparation (Beet - France) Seedbed preparation (Corn - Hungary) A range of vibrocultivators from 3 to 9 m working width + Tetra 50 Tractors: Working width: Transport width: 85 → 125 hp 62,54 → 91,97 kW 3,00 → 3,00 m. 9,84 → 9,84 ft 3,00 → 3,00 m. 9,84 → 9,84 ft Seed-Bed Cultivator 3 m + Tetra 60 Tractors: Working width: Transport width: 125 → 210 hp 91,97 → 154,51 kW 4,50 → 6,00 m. 14,76 → 19,69 ft 3,00 → 3,00 m. 9,84 → 9,84 ft Seed-Bed Cultivator 4.5 m or 6 m + Tetra 70 Tractors: Working width: Transport width: 210 → 310 hp 154,51 → 228,08 kW 7,50 → 7,50 m. 24,61 → 24,61 ft 3,00 → 3,00 m. 9,84 → 9,84 ft Seed-Bed Cultivator 7.5 m + Tetra 80 Tractors: Working width: Transport width: 310 → 400 hp 228,08 → 294,30 kW 9,00 → 9,00 m. 29,53 → 29,53 ft 3,00 → 3,00 m. 9,84 → 9,84 ft Seed-Bed Cultivator 9 m What are Tetra’s agronomical advantages? Surface levelling, sowing depth It is cheaper and more profitable on any cultivated plot if plants are grown at the same time. For perfect plant emergence, perfect levelling is required. The Tetra allows you to level, smooth and re-consolidate the soil in a single pass. Germination requires a seed depth which is deep enough to prevent the seed drying out but shallow enough to ensure a high rate of emergence and good plant density. Soil-seed contact To germinate, the seed must absorb a large amount of water. Once it has swollen, it will be able to live on its reserves while it waits for leaves and moves on to photosynthesis. Access to water will be through soil contact. If soil clods are too coarse, the seed can’t get to it easily. Crumbling reduces the presence of obstacles to lifting and porosity provides access to water and oxygen. Superficial crumbling In order to have small clods on the surface and the fine soil underneath, you can adjust the degree of refinement in different positions on the machine. In non crusting soil, the maximum degree of refinement and the best soil-seed contact possible is needed while avoiding rapid drying. The choice of ploughing depth also depends on pedo-climatic risks (crusting, dry conditions, etc.) during the germination and emergence phases. Soil warming To grow, each seed has to reach a minimum temperature in order to germinate. By mixing the top soil layers, the Tetra allows the soil to warm up more easily in the sun so the plant can reach the right temperature in order to grow. The Tetra also gives the seed access to air. It can then absorb oxygen but also release carbon dioxide. By breathing, it can germinate. Tines for every type of seedling Vibrocultivator tines Straight profile, Double spring Spacing between tines: 4 Rows of tines: 94 mm Width: 32 mm Thickness: 12 mm Length: 400 mm Vibrocultivator tines S-Shaped, Double spring Spacing between tines: 4 Rows of tines: 94 mm Width: 32 mm Thickness: 12 mm Length: 400 mm Vibrocultivator tines Straight Spacing between tines: 5 Rows of tines: 60 mm Width: 32 mm Thickness: 10 mm Length: 285 mm Vibrocultivator tines S-Shaped Spacing between tines: 5 Rows of tines: 60 mm Width: 32 mm Thickness: 10 mm Length: 285 mm Clever design Single beam chassis Made of high quality steel with a diameter of 150 x 150 mm, the main beam of the Tetra resists torsion effects to give a long working life. Being closer to the tractor, the machine’s centre of gravity is more centralized. This makes lifting easier and improves balance on the road. Highly resistant swinging pivots The vibrocultivators are equipped with pivot bars which allow the elements to swing. They are made of solid HTS steel (high yield strength) to provide flexibility to the lift and resistance to wear. Components parallel to the ground Once you have set the Tetra’s level, you can adjust the various working components. They are all 1.5 m wide and are independent. With the parallelogram and the swinging pivot, you can follow the field perfectly. Adjustable levelling blade Rear-facing, the position prevents accumulation of earth. It is equipped with small depth-adjustable tines that trim and level the ground. Spring-mounted and mechanically or hydraulically height adjustable, it adapts easily to conditions. Hydraulic locking For greater safety during storage and transport, the frame is fully locked by a balancing valve on the jack. This prevents the machine from opening accidentally. No additional handling is necessary to (un)lock the machine. Maintenance-free roller The twin roller side cover prevents small ridges forming between the roller elements to give uniform levels. Positioned inside the roller, the bearings are protected from splashes. Very low operating costs Light clay A light machine limits soil compaction by not overloading the tractor + equipment combination. Wide With such a light weight, it can maintain a good working width while coupled to a small tractor. Economical Its weight-width ratio allows you to save fuel by making more effective and fewer passes. Non-powered machine Unlike rotary harrows, seedbed preparers have no Power Take Off (PTO). As a result, they use less energy. Low wear Vibrocultivator tines are made of high strength steel and are equipped with coulters. You only have to change the coulters when they are worn. The levelling blade tines are replaced less frequently,. Work rate You are operational immediately with rapid folding and unfolding. Simple adjustments allow you to adapt the tools to different conditions in minutes. Thanks to generous working widths, you can prepare your seed beds in record time. 1 versatile roller for successful seedling preparation Twin roller Excellent dispersal of clods, even in pebbly soils, the twin roller roller perfectly finishes tine work and levels the surface. It has a double roller with staggered seating to avoid creating small ridges between the different roller elements. Leave no trace... A track eradicator allows you to loosen surfaces compacted by tractor wheels. Water can then infiltrate and so avoid lower return from wheel tracks. Grégoire Besson provides different track eradicators depending on the type of wheels and the type of soil. Narrow cast iron Eradication width: 4cm Sold by: 4 Ideal for depth and for making narrow passages in compacted soil. Duck’s foot Eradication width: 28 cm Sold by: 2 Perfect for shallow and wide work to erase tractor tyre tread marks. Space-saving and secure transport and storage The different elements of the Tetra are superimposed on each other when folded. This positioning avoids exposing tines to road users. This safety feature and its compactness are also advantages for storage. DREAL road traffic approval. Dimensions during transport or worst-case storage: 50 Width : 3,00 m. (9,84 ft.) Height : 1,75 m. (5,74 ft.) 60 Width : 3,00 m. (9,84 ft.) Height : 2,59 m. (8,50 ft.) 70 Width : 3,00 m. (9,84 ft.) Height : 3,35 m. (10,99 ft.) 80 Width : 3,00 m. (9,84 ft.) Height : 4,19 m. (13,75 ft.) A look around your machines... Recap 1.Ease of use 2.Real agronomic benefits 3.Quick settings 4.Very low maintenance 5.Intelligent design 6.Choice of tines and rollers 7.Low overall ownership costs 8.Effective track mark eradicators 9.Secure transport and storage 10.Adaptable to all types of seeds Configure your Tetra Configure your seed bed preparer quickly and get an idea of cost. Tractor power Recommended tractor power (can be adapted according to your location) Tractors from 85 to 125 ch Tractors from 125 to 210 ch Tractors from 210 to 310 ch Tractors from 310 to 400 ch Next question Receive your finished configuration Email* Send Print Contact us Tractor power : Tractors from 85 to 125 ch * Prices excluding taxes, delivery charges, entry into service and customs duties. Estimated price, non negotiated public price, ex works. 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