The invention solves the problem of gently loosening the compacted surface of potato ridges and the non-rail furrow between the ridges to more effectively retain water from precipitation or irrigation spray. At the same time, it allows precise fertilizer application to the root zone and efficient cultivation of several ridges while eliminating line changes or ridge pitch while driving. The cultivator working unit (1) has two hoeing rollers (2, 2 ') and a pivot wheel (3) between them, all on separate spring-loaded thrust arms (8) swinging to the beam (12), which has a central spring unit (13). The cultivator consists of at least three working units (1, 1', 1' ') fixed to the main frame (24). The outer working units (1´, 1´´) can slide on the tilting arms (25, 25´), and in the horizontal working position they are automatically moved on the tilting arms (25, 25´) as needed depending on the change of line or spacing ridge. The central clamping device (34) has replaceable and adjustable two application chisels (35), arranged opposite to each other for loosening the foot of the ridges from the side of the non-rail furrow. The application chisels (35) can be supplemented with a liquid fertilizer applicator
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