Benefits of the GrindStar®

The seasons’ goals and challenges

Ultra-flat tillage achieves the balancing act between field hygiene and low nitrogen mineralisation. Rapeseed pods are opened and volunteer rapeseed and weed seeds are safely allowed to emerge.

Establishing a catch crop in autumn, for example after corn, is also possible in one operation with the GrindStar®.


  • Soil protection:
    • Working the field with light, soil-friendly equipment
    • Under no circumstances should you till deeply if the ground is already dry
  • If applicable, crushing and mixing in the catch crops with even distribution; turning over freezing and partly hardy catch crops.
  • In order to carry as much water from the winter precipitation into the spring and summer as possible, the soil should only be tilled minimally in the spring.
  • The ground cover with crop residues should be ensured for as long as possible. Compared to previous variants with short disc harrows, cultivators, large spring tine harrows or actively driven devices, the ground cover is maintained for longer and the time and fuel consumption is minimised.
  • It is also possible to prepare seedbeds with the Grindstar before sowing the main crop in order to create an ultra-flat false seedbed for the successive crop.
  • Control of volunteer grain, volunteer rapeseed, catch crops, weeds and grass weeds after sowing the main crop, optionally with the spreading of undersown crops.
  • Optimal ratio between erosion protection (wind and water) and rot.
  • Fight weed infestation mechanically in order to leave a weed-free field for sowing.
  • Avoid water evaporation and promote plant growth.


  • When cultivating stubble, moisture should be conserved to ensure the emergence of volunteer grain and weeds.
  • The same applies when sowing catch crops.

Stubble tillage after winter cereals

  • Immediately after the grain harvest, two to three passes are carried out every 10 to 14 days or, depending on the weather, 14 to 21 days apart
  • Volunteer grains, weeds and grass weeds are encouraged to germinate and controlled with each subsequent tillage pass.
  • Crop residues remain on the soil surface, but are broken down and prepared for degradation and conversion by soil biology.
  • Primary soil tillage and seedbed preparation can be carried out as usual using existing tillage equipment.

Stubble tillage after winter rapeseed

  • Similar to volunteer grain, volunteer rapeseed is encouraged to germinate in several passes and is controlled mechanically with each pass.
  • Crop residues remain on the soil surface, but are broken down and prepared for degradation and conversion by soil biology.
  • Primary soil tillage and seedbed preparation can be carried out as usual using existing tillage equipment.
  • Alternative: after one pass with the GrindStar, a summer catch crop is sown 10 to 14 days later in another pass (among other things for N storage / reduction of N leaching). The main crop is sown after the catch crop has been ploughed using the usual GrindStar or with strip-till or no-till sowing technology.
  • Catch crop management in the summer: Establishment and use of summer catch crops
  • The catch crop can be sown under favourable conditions and with less competitive previous crops during the first pass with the GrindStar or, alternatively, 10 to 14 days after the first stubble tillage with the second pass. Alternatively, the catch crop can be sown with a no-till seed drill immediately after the harvest. The catch crop is ploughed before sowing the main crop efficiently and effectively with the GrindStar in a maximum of two passes at intervals of 7 to 10 days.
  • A protective layer of mulch is beneficial to counteract wind and water erosion but also possible overheating of the soil
    • Interruption of capillarity when stubble is cut across the entire area
    • Ultra-flat cut to secure soil moisture


Stubble tillage after silo and grain maize

  • As an alternative to the mulcher and blade roller, the GrindStar can be used to effectively shred corn stubble and combat the corn borer.
  • After silage maize, the successive crop can be sown in the autumn after one pass with the GrindStar with or without subsequent primary soil tillage. It would also be conceivable to sow using a strip-till or no-till seed drill after one pass with the GrindStar or to sow a winter catch crop with the GrindStar during stubble tillage.
  • After grain maize, the GrindStar could replace the knife roller and mulcher and be used before primary soil tillage and sowing. It would also be conceivable to sow using direct seeding technology and then a pass with the GrindStar. This option has the advantage that, for example, a single-disc direct seed drill can drill into solid soil and hairpinning through shredded corn stubble and shredded corn straw occurs less frequently. Sowing and field emergence can thus be significantly optimised, while borer control takes place by shredding the crop residues after sowing.

Ploughing of summer catch crops

  • Up to now, summer catch crops have been carefully ploughed using short disc harrows, various cultivators/large-spring tine harrows in combination with a mulcher or blade roller, or using a milling machine/rotary harrow and, optionally, a leading mulcher. As a result, the organic material is usually greatly crushed and worked in. This is associated with some nutrient losses due to escaping plant sap. With the GrindStar, summer catch crops can be ploughed in a maximum of two passes at intervals of 7 to 10 days. In the case of very well-developed catch crops, a combination with a leading blade roller during the first pass is conceivable.
  • In comparison to intensive work with actively driven equipment, the organic material is not crushed as much and is hardly mixed in, but is instead deposited on the surface of the soil. Less plant sap comes out and the nutrient losses are significantly lower compared to milling, with reduced effort and significantly lower costs. It is also conceivable here to sow the successive crop using strip-till or no-till sowing technology.
  • Control of volunteer grain, volunteer rapeseed, weeds and grass weeds before sowing (possibly also after sowing in combination with sowing undersown crops); raising previously tilled areas to allow them to evaporate and dry; seedbed preparation.
  • On areas where primary soil tillage (mulch sowing) has already been carried out in the summer or autumn, there may be a need for a second pass in order to create a table that is as clean as possible and at the same time to shred coarse particles.
  • Under moist conditions, the field can dry out so that good seed placement can be ensured. If you have a no-till seed drill, this operation can also be carried out after sowing.
  • Compared to common practice methods, the advantage is that the no-till coulters do not work in an over-loosened seed horizon and the depth control is better. At the same time, the downstream pass with the GrindStar allows undersown crops to be sown.

Saphir Maschinenbau GmbH

Wichernstraße 1
27404 Bockel

Phone: +49 (0) 4281 / 712 - 799
Fax: +49 (0) 4281 / 712 - 46