Effects of Soil Moisture Content, Tire Inflation Pressure, and Tillage Speed on Tractive Performance of 2WD Tractor in Northern Iraq

Khalid E. Al-Mastawi, Ghazwan A. Dahham, Layth M. Yahya

Abstract

One of the main uses of a tractor involves pulling drawbar equipment. During such use, the tractor is exposed to factors such as the soil moisture content, type of tillage tool, and tractor tire pressure, which can adversely impact its performance. This study was conducted in Mosul province in northern Iraq, an area characterized by a clay soil texture. The aim of the study was to investigate the factors that affect tractor performance during tillage operations by investigating various traits, including the slippage, mobility number (MN), rolling resistance (RR), tractive force (TF), and tractive efficiency (TE), known to influence tractor performance in the field. These traits were investigated in relation to three levels of soil moisture content (10–13%, 14–17%, and 18–21%), two levels of rear tire inflation pressure (85 kPa and 140kPa), and three levels of travelling speed (3.15 km/hr, 4.85 km/hr, and 6.32 km/hr). The results of the study indicate the significant superiority of the tractor performance in terms of all the examined traits at a soil moisture content of 14–17%. Moreover, as the slippage increases, the RR and TF increase in an inversely proportional way to the MN and TE, thereby affecting the tractor’s drawbar ability. The best interaction treatment was found to involve a 14–17% soil moisture content, a 85 kPa tire pressure, and a 3.15 km/hr travelling speed. This interaction treatment achieved the best results with regard to all the traits when compared with the other interaction treatments.

 

Keywords: inflation pressure; 2WD tractor; mobility number; slippage; rolling resistance


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