Table 3.

Effect of coating materials on draft force.

Coating materials	Tillage tool	Remarks	Reference
Carbon nanotube-hard chromium composite	A simple tine	The draft requirements of the coated carbon nanotube hard chromium composite tillage tools were approximately 43.92%, 44.14%, and 38.02% less than the uncoated tools, respectively.	[84]
Teflon and Chromium	Moldboard share	A minimum draft of 0.235 kN was achieved with a Teflon-coated moldboard at a forward speed of 2 kmh-1 and a humidity range of 20–25%. A maximum draft of 0.336 kN was achieved with an uncoated plow bottom operating at a speed of 4 kmh-1 in a moisture range of 30–35%.	[40]
Ultra high molecular weight polyethylene (UHMW-PE)	Chisel tine	It has been found that the modification to the furrower tines by UHMW-PE coating can reduce draft force significantly.	[5]
TiCrN–TiAlN–TiAlSiN–TiAlSiCN	Sweep blade	The draft force of all blades showed promising results. As the travel distance increases the draft force decreases for multilayers coated blades compared with uncoated.	[58]
Laser coated sweep	Sweep blade	A significant decrease in draft force of all sweep blades was found after 74 km of operation.	[85]
Nickel based alloyed powder	Cultivator sweep blade	After 74 km of operation, a significant drop in draft force was reported for all sweep blades.	[38]