Machines inspired by the active ridging and preparation of the soil after the potato seeding process. The high diameter tilling rotor fits long hooked blades projected for a deep preparation and refinement of the soil, which right away will be ridged on the potato seeds by specific rear bed former hoods. The P ridgers can be easily converted in real horticultural bed formers, used for the pre-seeding or transplanting soil preparation process. This conversion can be easily obtained by completing the rotor with additional blades (the working width is equal to the machine width) and adapting rear tailor-made bed former hoods, bed former rollers and even rollers for the flat working process. The series is composed by fixed and folding machines, with mechanics supporting up to 400 hp tractors.