Interrelation of soil hardness, width, depth of tillage and resistivity of cultivator instruments

Abstract

The article examines the interrelation of soil hardness, width, depth of tillage and resistivity of cultivator instruments. The minimum working width and maximum allowable working width are determined under preclusion conditions of blocking working elements with plant residues. The variable width is necessary for ensuring the minimum resistivity of the instrument in accordance with agrotechnical requirements to cultivation and for improving the efficiency of cultivator machine. A nomogram was obtained on the basis of the calculations specified. The nomogram is served to set graphically the working width of the cultivator for a given depth of tillage at different speeds and in different types of soils. The nomogram for the determination of working width of the cultivator machine shows that the longitudinal hardness is 1.05 MPa at the depth of tillage of 7.5 cm. The resistivity of the cultivator machine is 2.4 kN/m. The developed nomogram for the determination of working width of the cultivator machine shows that in the recommended range of cultivation depth from 6-14 cm the width rates varies from 2.4 to 4.8 m at the speed rates of 5-12 km/h.