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The article presents the results of studies in the field of kinematics of the interaction of the elements of a rational working body along the ridge of potato soil to substantiate its parameters. Caring for potato plants is especially important in the initial (pre-emergence) period of the growing season, since at this time the formation of the future crop and the need or failure of subsequent mechanical and chemical treatments occur. Existing passive tools do not provide high-quality destruction of weeds, reactive-active ones do not sufficiently process the tops of the ridge, and milling (active) tools lead to excessive soil dispersion, have a complex drive, high energy and metal consumption. The purpose of the study is to substantiate the geometric scheme and parameters of a rotary harrow for weed destruction during pre-emergence processing of potato comb planting. According to the results of theoretical and field research and parameters of a rotary harrow that fits the profile of the ridge and rolls over the surface of the ridge, which can completely comb and drag weeds along the ridge, destroy the connection of their root neck with the soil, as well as dump them on top of the soil in a certain mode of operation. Namely, the points of the outer rim of the harrow along the row spacing with radius R will describe an ordinary cycloid, and have a kinematic operating mode indicator λ = 1, and all points lying inside the circle of the harrow rim with a small radius r i , a shortened cycloid and have a kinematic operating mode indicator λ < 1 (points of scrapers-slats).

The article presents the theoretical results of the performance indicators of the defoliator. They depend on the parameters and modes of the defoliator operation. It operates on the basis of the description of the justification, which is provided in the work. The combined defoliator is aimed at removing potato tops with working bodies. They are multiple in number and they combine the consistency of their rotation including their vertical axis. Moreover, with the horizontal axis they are in the zone of their interaction without touching each other.

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