Conducted analysis of calculation methods of estimated figures of facilities for crop tending of cultivated crop according to hilled technology showed that in the theories of determination of geometrical dimensions and shapes of working parts surfaces of inter-row cultivator now some points are left, which are not solved . Besides, obtained data from studies of many scientists can be applied to new working tool with flat discs for inter-row cultivator. Consequently, additional theoretical and

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... pirical support of optimal constructive-operating conditions of above mentioned working tools of inter-row cultivator is demanded. For mechanized crop tending of cultivated crop according to hilled technology we offered working tool of inter-row cultivator with flat disc, set for native or foreign inter- row cultivator. Offered working tool of cultivator will allow to clip off pest in seed inter rows of cultivated plants, and also dust not cut pests on the flanks of ridges and between culms of cultivated crop on upper base of soil rigs . In the article process of formation of secondary soil rigs by working tools with flat discs during modeling the first mechanized crop tending of cultivated crops in laboratory conditions is observed. Considering agrotechnical requirements and physical mechanical properties of soil, reference profile of soil rigs is accepted, forming during mechanized crop tending, which conditionally can accept as ideal, and an original optimization criterion . After practical realization of research in soil box and statistical treatment of obtained data fit equations were got, in which independent factors of process took the form of natural and coded levels. It was found out that speed change of cultivator moving within 1,2...2,4 m/s, angled к of flat disk approach angle from 5º to 20º, increases the range of soil throwing away and width of soil dust on the flanks and upper base of the first soil rigs (kсэ → max). At the angle of  attack of flat discs within 25º...30º and cultivator conveying speed from1,2 m/s to 1,6 m/s there is growth of width of dusted layers hпр, an coefficient kсэ is maximum (kсэ = 0,98 with diameter of flat discs 0,3 m).