| Summary: | One of the best precursors for winter wheat is fallow. Its application aims to solve two important tasks: preserving and accumulating soil moisture and weed control. The authors of this paper have designed a new modular harrow for fallow tillage, which can work stably at a depth of 5–6 cm tillage while maintaining and even accumulating soil moisture. This article describes a method designed by the authors for a reasonable selection of the design parameters concerning the working devices mounted inside the new harrow, such as their length and working width, as well as the angles of vertical inclination (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="italic">ε</mi></semantics></math></inline-formula>) and horizontal deviation (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="italic">γ</mi></semantics></math></inline-formula>) of blades, depending on the accepted depth of the upper soil layer loosening. To reduce the soil tillage resistance of the harrowing unit resulting in a reduction in the tractor fuel consumption, the value of the inclination angle (<i>ε</i>) of its vertical blade should be chosen so that the corresponding change in the value of the deflection angle of the horizontal blade (<i>γ</i>) complies with the constrain of the product of tangents of these angles. Moreover, preference should be given to choosing the value of the angle <i>ε</i> with the subsequent determination of the angle <i>γ</i> value. It is demonstrated that proper use of the new type of harrow assures fuel savings and decreases carbon dioxide emissions even if fossil fuel alone is used. Additional reduction of CO<sub>2</sub> emission can be achieved when biofuels are used as a replacement for fossil ones.
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