Disc ploughs break up undisturbed soil by inverting it to bury surface weeds and trash. Regular use of disc ploughs reduces soil aggregates to small particles and produces a compacted layer or plough pan which prevents air, water or roots penetrating the subsoil. When it rains, soil particles on the surface collapse together to form a crust which repels air and water and is difficult for seedlings to break through.
sell disc plough 
