Optimizing drawbar pull resistance in a grape row machine with integrated fertilizer and subsoiling functions

This article discusses the resistance to traction of a resource-saving combined machine equipped with a fertilizer applying implement and deep loosener that operates between vine rows. The resistance depends on its parameters, working depth, the physical-mechanical properties of the soil, the diameter of the vine roots, and the speed of the unit, as well as presents a general theoretical expression of the coulter parameters. The traction resistance of a deep loosener equipped with a fertilizer applicator has been determined by considering the resistance generated by its coulter, blade, stem, and the resistance produced by the soil coverers. The resistance to the coulter is determined under the assumption that the soil in the influenced zone of the layer being cultivated is fragmented due to the displacement of soil under its effect. The resistance to traction of the subsoiler blade is primarily due to cutting the vine roots. Accordingly, the value of its traction resistance is determined by multiplying the number of roots that come into contact with the blade. The resistance to traction of the subsoiler shaft and soil coverer interacts with the soil loosened by the coulter and is determined by taking into account the lateral displacement of the soil.