soil (without stones)

With a downforce lower than 5 daN, grinding will be quite inefficient. Only homogenization should be present. After 1 minute, sample colour uses to be completely homogeneous.

Longer ‘grinding’ times are still possible.

With a speed of 600 rpm, sample has been ‘ground’ to homogeneous powder. If particles might be crushed, lowering of speed down to 400 rpm is still possible.