Highly effective and compact cultivators must pullapart plants during vegetation in order to save light energy and area under crops. Cultivators ensuring a helical method for pulling plants apart are already available. The present paper suggests the criteria of the efficiency of using the area under crops of the cultivator and deformation of the leaf crown of plants (sigma- and delta-spectra). With respect to these values the main task of calculating the helix has been formulated. Having Chinese cabbage as an illustration, an equation of the helix has been derived. With the aid of the equation an optimal helix can be marked along the circle in polar coordinates.
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