A soil prepn appliance for the breaking up, mixing and aerating of compost, humus peat or earth in horticulture or sports grounds, has a funnel above the inclined shredder belt which is revolved fast around two return drums. This belt is armed with L-shaped flights or channels mounted back-to-back to throw the material against the upper wall. The fines pass through a spring-loaded grating and the lumps fall back into the funnel. ADVANTAGE - This can withstand heavy loads by stones or wood without causing damage.
