{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,3]],"date-time":"2026-04-03T04:54:49Z","timestamp":1775192089659,"version":"3.50.1"},"reference-count":72,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2020,4,26]],"date-time":"2020-04-26T00:00:00Z","timestamp":1587859200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>This study was conducted to analyze the effects of tillage depth and gear selection on the mechanical load and fuel efficiency of an agricultural tractor during plow tillage. In order to analyze these effects, we developed an agricultural field measuring system consisting of a load measurement part (wheel torque meter, proximity sensor, and real-time kinematic (RTK) global positioning system (GPS)) and a tillage depth measurement part (linear potentiometer and inclinometer). Field tests were carried out using moldboard plows with a maximum tillage depth of 20 cm and three gear selections (M2H, M3L, and M3H) in a rice stubble paddy field for plow tillage. The average travel speed and slip ratio had the lowest M2H and the highest M3L. M3H had the highest theoretical speed, but the travel speed was 0.13 km\/h lower than M3L due to the reduction in the axle rotational speed at deep tillage depth. Regarding engine load, the higher the gear, the greater the torque and the lower the axle rotation speed. The front axle load was not significantly affected by the tillage depth as compared to other mechanical parts, except for the M3H gear. The rear axle load generated about twice the torque of the front wheel and overall, it tended to show a higher average rear axle torque at higher gear selection. The rear axle load and fuel rate were found to be most affected by the combination of the tillage depth and gear selection combination. Overall, field test results show that the M3H had the highest fuel efficiency and a high working speed while overcoming high loads at the same tillage depth. In conclusion, M3H is the most suitable gear stage for plow cultivation, and the higher the gear stage and the deeper the tillage depth during plowing, the higher the fuel efficiency. The results of this study will be useful for analyzing mechanical load and fuel efficiency during farm operations. In a future study, we will conduct load analysis studies in other farming operations that consider various soil mechanics factors as well as tillage depths and gear selections.<\/jats:p>","DOI":"10.3390\/s20092450","type":"journal-article","created":{"date-parts":[[2020,4,28]],"date-time":"2020-04-28T10:30:58Z","timestamp":1588069858000},"page":"2450","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Analysis of Tillage Depth and Gear Selection for Mechanical Load and Fuel Efficiency of an Agricultural Tractor Using an Agricultural Field Measuring System"],"prefix":"10.3390","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9615-683X","authenticated-orcid":false,"given":"Yeon-Soo","family":"Kim","sequence":"first","affiliation":[{"name":"Department of Biosystems Machinery Engineering, Chungnam National University, Daejeon 34134, Korea"},{"name":"Convergence Agricultural Machinery Group, Korea Institute of Industrial Technology (KITECH), Gimje 54325, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9669-4761","authenticated-orcid":false,"given":"Wan-Soo","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Biosystems Machinery Engineering, Chungnam National University, Daejeon 34134, Korea"},{"name":"Department of Smart Agricultural Systems, Chungnam National University, Daejeon 34134, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Seung-Yun","family":"Baek","sequence":"additional","affiliation":[{"name":"Department of Biosystems Machinery Engineering, Chungnam National University, Daejeon 34134, Korea"},{"name":"Department of Smart Agricultural Systems, Chungnam National University, Daejeon 34134, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4627-191X","authenticated-orcid":false,"given":"Seung-Min","family":"Baek","sequence":"additional","affiliation":[{"name":"Department of Biosystems Machinery Engineering, Chungnam National University, Daejeon 34134, Korea"},{"name":"Department of Smart Agricultural Systems, Chungnam National University, Daejeon 34134, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Young-Joo","family":"Kim","sequence":"additional","affiliation":[{"name":"Convergence Agricultural Machinery Group, Korea Institute of Industrial Technology (KITECH), Gimje 54325, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sang-Dae","family":"Lee","sequence":"additional","affiliation":[{"name":"Convergence Agricultural Machinery Group, Korea Institute of Industrial Technology (KITECH), Gimje 54325, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1212-9018","authenticated-orcid":false,"given":"Yong-Joo","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Biosystems Machinery Engineering, Chungnam National University, Daejeon 34134, Korea"},{"name":"Department of Smart Agricultural Systems, Chungnam National University, Daejeon 34134, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2020,4,26]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"303","DOI":"10.5307\/JBE.2011.36.5.303","article-title":"Effects of Distribution of Axle Load and Inflation Pressure of Tires on Fuel Efficiency of Tractor Operations","volume":"36","author":"Lee","year":"2011","journal-title":"J. Biosyst. Eng."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"403","DOI":"10.3846\/transport.2010.50","article-title":"Tractor engine load and fuel consumption in road construction works","volume":"25","author":"Juostas","year":"2010","journal-title":"Transport"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"106","DOI":"10.3846\/1648-6897.2009.17.106-113","article-title":"Evaluating working quality of tractors by their harmful impact on the environment","volume":"17","author":"Juostas","year":"2009","journal-title":"J. Environ. Eng. Landsc. Manag."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"113","DOI":"10.1016\/S0022-4898(99)00022-1","article-title":"Analysis of transmission load of agricultural tractors","volume":"37","author":"Kim","year":"2000","journal-title":"J. Terramechanics"},{"key":"ref_5","unstructured":"Nahmgung, M.J. (2001). Load Analysis of Driving Axles and Life Evaluation of Driving Gear of PTO on Tractors. [Ph.D. Thesis, Sungkyunkwan University]."},{"key":"ref_6","first-page":"69","article-title":"Influence of tillage depth, penetration angle and forward speed on the soil\/thin-blade interaction force","volume":"16","author":"Moeenifar","year":"2014","journal-title":"Agric. Eng. Int. CIGR J."},{"key":"ref_7","first-page":"382","article-title":"Tillage depth and forward speed effects on draft of three primary tillage implements in clay loam soil","volume":"7","author":"Naderloo","year":"2009","journal-title":"J. Food Agric. Environ."},{"key":"ref_8","unstructured":"Miettinen, M., Oksanen, T., Suomi, P., and Visala, A. (2006, January 1\u20132). Fault Diagnostics in Agricultural Machines. Proceedings of the Automation Technology in Off-Road Equipment, Bonn, Germany."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"207","DOI":"10.1016\/j.compag.2018.03.012","article-title":"A decision support system for agricultural machines and equipment selection: A case study on olive harvester machines","volume":"148","author":"Hafezalkotob","year":"2018","journal-title":"Comput. Electron. Agric."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"305","DOI":"10.1515\/opag-2019-0029","article-title":"MACHoice: A Decision Support System for agricultural machinery management","volume":"4","author":"Cunha","year":"2019","journal-title":"Open Agric."},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Osuch, A., Osuch, E., Rybacki, P., Przygodzi\u0144ski, P., Koz\u0142owski, R., and Przybylak, A. (2020). A decision support method for choosing an agricultural machinery service workshop based on fuzzy logic. Agriculture, 10.","DOI":"10.3390\/agriculture10030076"},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"Da Silva, C., Rodrigues de S\u00e1, J., and Menegatti, R. (2019). Diagnostic of Failure in Transmission System of Agriculture Tractors Using Predictive Maintenance Based Software. AgriEngineering, 1.","DOI":"10.3390\/agriengineering1010010"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"115","DOI":"10.1016\/j.compag.2018.08.014","article-title":"A decision-support system for analyzing tractor guidance technology","volume":"153","author":"Lindsay","year":"2018","journal-title":"Comput. Electron. Agric."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"2718","DOI":"10.3906\/elk-1807-165","article-title":"In-field failure assessment of tractor hydraulic system operation via pseudospectrum of acoustic measurements","volume":"27","author":"Gupta","year":"2019","journal-title":"Turk. J. Electr. Eng. Comput. Sci."},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Gupta, S., Khosravy, M., Gupta, N., Darbari, H., and Patel, N. (2019). Hydraulic system onboard monitoring and fault diagnostic in agricultural machine. Braz. Arch. Biol. Technol., 62.","DOI":"10.1590\/1678-4324-2019180363"},{"key":"ref_16","first-page":"751","article-title":"Analysis of tractor transmission and driving axle loads","volume":"44","author":"Kim","year":"2001","journal-title":"Trans. ASAE"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"163","DOI":"10.5307\/JBE.2011.36.3.163","article-title":"Evaluation of Tractor PTO Severeness during Rotary Tillage Operation","volume":"36","author":"Kim","year":"2011","journal-title":"J. Biosyst. Eng."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"90","DOI":"10.1016\/j.still.2013.07.013","article-title":"Effects of gear selection of an agricultural tractor on transmission and PTO load during rotary tillage","volume":"134","author":"Kim","year":"2013","journal-title":"Soil Tillage Res."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"75","DOI":"10.1016\/j.jterra.2015.06.002","article-title":"Analysis of the PTO load of a 75 kW agricultural tractor during rotary tillage and baler operation in Korean upland fields","volume":"60","author":"Lee","year":"2015","journal-title":"J. Terramechanics"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"97","DOI":"10.5109\/1911182","article-title":"Analysis of the load of a transplanter PTO shaft based on the planting distance","volume":"63","author":"Kim","year":"2018","journal-title":"J. Fac. Agric. Kyushu Univ."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"135","DOI":"10.1007\/s42853-019-00016-y","article-title":"Power Analysis of a 3-kW Class Motor-Driven Multipurpose Walking-Type Transplanter","volume":"44","author":"Lim","year":"2019","journal-title":"J. Biosyst. Eng."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"723","DOI":"10.7744\/kjoas.20190048","article-title":"Strength analysis of mechanical transmission using equivalent torque of plow tillage of an 82 kW-class tractor","volume":"46","author":"Kim","year":"2019","journal-title":"Korean J. Agric. Sci."},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Kim, Y.S., Lee, P.U., Kim, W.S., Kwon, O.W., Kim, C.W., Lee, K.H., and Kim, Y.J. (2019). Strength analysis of a PTO (Power Take-Off) gear-train of a multi-purpose cultivator during a rotary ditching operation. Energies, 12.","DOI":"10.3390\/en12061100"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"11","DOI":"10.1016\/S0167-1987(99)00100-2","article-title":"Effect of deep-tillage and nitrogen fertilization interactions on dryland corn (Zea mays L.) productivity","volume":"54","year":"2000","journal-title":"Soil Tillage Res."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"1977","DOI":"10.13031\/2013.27699","article-title":"Tillage implement forces operating in silty clay loam","volume":"39","author":"Grisso","year":"1996","journal-title":"Trans. Am. Soc. Agric. Eng."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"379","DOI":"10.13031\/2013.5363","article-title":"Tillage depth, tillage timing, and cover crop effects on cotton yield, soil strength, and tillage energy requirements","volume":"16","author":"Raper","year":"2000","journal-title":"Appl. Eng. Agric."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.jterra.2015.02.008","article-title":"Spatial distribution of soil forces on moldboard plough and draft requirement operated in silty-clay paddy field soil","volume":"60","author":"Mari","year":"2015","journal-title":"J. Terramechanics"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"161","DOI":"10.1016\/j.jterra.2003.11.001","article-title":"Steering forces on undriven tractor wheel","volume":"40","author":"Raheman","year":"2003","journal-title":"J. Terramechanics"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"27","DOI":"10.1016\/j.jterra.2018.04.002","article-title":"Performance of combined offset disc harrow (front active and rear passive set configuration) in soil bin","volume":"78","author":"Upadhyay","year":"2018","journal-title":"J. Terramechanics"},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"369","DOI":"10.6090\/jarq.44.369","article-title":"Reduction rates of fuel consumption by gear up and throttle down on an agricultural tractor","volume":"44","author":"Gotoh","year":"2010","journal-title":"Jpn. Agric. Res. Q."},{"key":"ref_31","unstructured":"Grisso, R., Pitman, R., Perumpral, J.V., Vaughan, D., Roberson, G.T., and Hoy, R.M. (2011). \u201cGear up and Throttle down\u201d to Save Fuel, Virginia Cooperative Extension."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"46","DOI":"10.1016\/j.biosystemseng.2020.02.008","article-title":"Automatic gear-shifting strategy for fuel saving by tractors based on real-time identification of draught force characteristics","volume":"193","author":"Li","year":"2020","journal-title":"Biosyst. Eng."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"137","DOI":"10.1016\/j.still.2015.06.001","article-title":"Effect of controlled traffic system on machine fuel saving in annual two crops region in North China Plain","volume":"153","author":"Chen","year":"2015","journal-title":"Soil Tillage Res."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"104570","DOI":"10.1016\/j.still.2020.104570","article-title":"Effect of fuel saving and crop energy output on controlled traffic system under small machinery in loess plateau of China","volume":"199","author":"Chen","year":"2020","journal-title":"Soil Tillage Res."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"104311","DOI":"10.1016\/j.still.2019.104311","article-title":"Efficiency of disc harrow adjustment for stubble tillage quality and fuel consumption","volume":"194","author":"Damanauskas","year":"2019","journal-title":"Soil Tillage Res."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"45","DOI":"10.1016\/j.biosystemseng.2019.06.023","article-title":"Experimental validation of tyre inflation pressure model to reduce fuel consumption during soil tillage","volume":"186","author":"Damanauskas","year":"2019","journal-title":"Biosyst. Eng."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.jterra.2016.11.002","article-title":"A device to measure wheel slip to improve the fuel efficiency of off road vehicles","volume":"70","author":"Tewari","year":"2017","journal-title":"J. Terramechanics"},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"171","DOI":"10.1016\/S1537-5110(02)00261-1","article-title":"The effect of gang angle of offset disc harrows on soil tilth, work rate and fuel consumption","volume":"84","author":"Serrano","year":"2003","journal-title":"Biosyst. Eng."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"15","DOI":"10.1007\/BF02182808","article-title":"Effect of soil compaction on root growth and uptake of phosphorus","volume":"77","author":"Shierlaw","year":"1984","journal-title":"Plant Soil"},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"153","DOI":"10.1016\/j.still.2004.07.004","article-title":"Effects of traffic on soil aeration, bulk density and growth of spring barley","volume":"79","author":"Czyz","year":"2004","journal-title":"Soil Tillage Res."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"1062","DOI":"10.1111\/j.1365-2389.2007.00886.x","article-title":"Changes in the macro-pore structure of restored soil caused by compaction beneath heavy agricultural machinery: A morphometric study","volume":"58","author":"Stauber","year":"2007","journal-title":"Eur. J. Soil Sci."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"300","DOI":"10.7745\/KJSSF.2016.49.4.300","article-title":"Effect of Temperature and Plow Pan on Water Movement in Monolithic Weighable Lysimeter with Paddy Sandy Loam Soil during Winter Season","volume":"49","author":"Seo","year":"2016","journal-title":"Korean J. Soil Sci. Fertil."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"1075","DOI":"10.1093\/jxb\/47.8.1075","article-title":"Effects of soil mechanical impedance on root and shoot growth of Lolium perenne L., Agrostis capillaris and Trifolium repens L.","volume":"47","author":"Cook","year":"1996","journal-title":"J. Exp. Bot."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"169","DOI":"10.1016\/j.still.2003.12.004","article-title":"Pot study on wheat growth in saline and waterlogged compacted soil: I. Grain yield and yield components","volume":"77","author":"Saqib","year":"2004","journal-title":"Soil Tillage Res."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"125","DOI":"10.1016\/S0167-1987(00)00188-4","article-title":"The effect of seeding and tillage methods on productivity of rice-wheat cropping system","volume":"61","author":"Singh","year":"2001","journal-title":"Soil Tillage Res."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"759","DOI":"10.2134\/agronj1994.00021962008600050004x","article-title":"Soil Compaction and Root Growth: A Review","volume":"86","author":"Unger","year":"1994","journal-title":"Agron. J."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"13","DOI":"10.1016\/j.still.2017.08.002","article-title":"Overview of soil-machine interaction studies in soil bins","volume":"175","author":"Ani","year":"2018","journal-title":"Soil Tillage Res."},{"key":"ref_48","unstructured":"ASABE (2009). Standards EP542. Procedure for Using and Reporting Data Obtained with the Soil Cone Penetrometer, ASABE."},{"key":"ref_49","unstructured":"ASABE (2005). Standards S313.3. Soil Cone Penetrometer, ASABE."},{"key":"ref_50","unstructured":"(2020, January 15). Soil Bulk Density\/Moisutre\/Aeration, Available online: https:\/\/webcache.googleusercontent.com\/search?q=cache:jnVjrkgKWIwJ:https:\/\/www.nrcs.usda.gov\/Internet\/FSE_DOCUMENTS\/nrcs142p2_053260.pdf+&cd=12&hl=ko&ct=clnk&gl=kr."},{"key":"ref_51","unstructured":"Park, J.G. (2008). Bio-Production Machinery Engineering, CIR. [1st ed.]."},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"54","DOI":"10.2134\/jae.1979.0054","article-title":"A flow diagram for teaching texture-by-feel analysis","volume":"8","author":"Thien","year":"1979","journal-title":"J. Agron. Educ."},{"key":"ref_53","doi-asserted-by":"crossref","unstructured":"Kim, Y., Kim, T., Kim, Y., Lee, S., Park, S., and Kim, W. (2020). Development of a Real-Time Tillage Depth Measurement System for Agricultural Tractors: Application to the Effect Analysis of Tillage Depth on Draft Force during Plow Tillage. Sensors, 20.","DOI":"10.3390\/s20030912"},{"key":"ref_54","doi-asserted-by":"crossref","unstructured":"Johannesson, P., and Speckert, M. (2013). Guide to Load Analysis for Durability in Vehicle Engineering, John Wiley & Sons.","DOI":"10.1002\/9781118700518"},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"96","DOI":"10.1016\/j.compag.2015.04.003","article-title":"Reducing fuel consumption in weed and pest control using robotic tractors","volume":"114","author":"Emmi","year":"2015","journal-title":"Comput. Electron. Agric."},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"227","DOI":"10.1016\/0021-8634(87)90091-6","article-title":"Microcomputer-based tractor performance monitoring and optimization system","volume":"38","author":"Grogan","year":"1987","journal-title":"J. Agric. Eng. Res."},{"key":"ref_57","unstructured":"Goering, C.E. (1992). Engine and Tractor Power, American Society of Agricultural Engineers (ASAE)."},{"key":"ref_58","first-page":"88","article-title":"Estimation of Tractor Wheel Slippage with Different Tire Pressures for 4WD and 2WD Driving Systems","volume":"18","author":"Janulevicius","year":"2019","journal-title":"In Engineering for Rural Development, Proceedings of the 18th International Scientific Conference, Jelgava, Latvia, 22\u201324 May 2019"},{"key":"ref_59","unstructured":"Gill, W.R., and Berg, G.E.V. (1967). Soil Dynamics in Tillage and Traction (No. 316\u2013317), Agricultural Research Service, US Department of Agriculture."},{"key":"ref_60","unstructured":"Macmillan, R.H. (2003). The Mechanics of Tractor-Implement Performance, International Commission of Agricultural and Biosystems Engineering."},{"key":"ref_61","unstructured":"Wong, J.Y. (2008). Theory of Ground Vehicles, John Wiley & Sons."},{"key":"ref_62","doi-asserted-by":"crossref","first-page":"203","DOI":"10.1016\/j.still.2018.08.005","article-title":"Effects of soil deformation on clay dispersion in loess soil","volume":"184","author":"Lipiec","year":"2018","journal-title":"Soil Tillage Res."},{"key":"ref_63","doi-asserted-by":"crossref","first-page":"175","DOI":"10.1016\/j.still.2015.06.006","article-title":"Effects of soil deformation and surface mulching on soil physical properties and soybean response related to weather conditions","volume":"153","author":"Siczek","year":"2015","journal-title":"Soil Tillage Res."},{"key":"ref_64","first-page":"1","article-title":"Soil Drying Effects on Soil Strength and Depth of Hardpan Layers as Determined from Cone Index Data","volume":"X","author":"Tekeste","year":"2008","journal-title":"Agric. Eng. Int. CIGR J."},{"key":"ref_65","unstructured":"Schoeneberger, P.J., Wysocki, D.A., and Benham, E.C. (2012). Soil Survey Staff (2012) Field Book for Describing and Sampling Soils, Version 3.0, Natural Resources Conservation Service, National Soil Survey Center."},{"key":"ref_66","unstructured":"British Standards Institution (2004). BS EN ISO 14688-2: 2004 Method of Test for Soils for Civil Engineering Purposes, British Standards Institution."},{"key":"ref_67","unstructured":"Park, S.U. (2019). Fatigue Life Evaluation of Spiral Bevel Gear of Transmission Using Agricultural Workload of Tractor. [Ph.D. Thesis, Chungnam National University]."},{"key":"ref_68","doi-asserted-by":"crossref","first-page":"238","DOI":"10.1016\/j.still.2019.02.011","article-title":"Comparison between the draft force requirements and the disturbed area of a single tine, parallel double tines and partially swerved double tines subsoilers","volume":"191","author":"Aday","year":"2019","journal-title":"Soil Tillage Res."},{"key":"ref_69","doi-asserted-by":"crossref","first-page":"73","DOI":"10.1016\/j.biosystemseng.2017.03.008","article-title":"Discrete element simulations and experiments of soil disturbance as affected by the tine spacing of subsoiler","volume":"168","author":"Hang","year":"2018","journal-title":"Biosyst. Eng."},{"key":"ref_70","doi-asserted-by":"crossref","first-page":"75","DOI":"10.1016\/j.still.2019.03.021","article-title":"Specific draft estimation model for offset disc harrows","volume":"191","author":"Upadhyay","year":"2019","journal-title":"Soil Tillage Res."},{"key":"ref_71","first-page":"197","article-title":"Influence of Tyre Inflation Pressure and Wheel Load on the Traction Performance of a 65 kW MFWD Tractor on a Cohesive Soil","volume":"5","author":"Battiato","year":"2013","journal-title":"J. Agric. Sci."},{"key":"ref_72","doi-asserted-by":"crossref","first-page":"105","DOI":"10.1016\/j.still.2011.03.002","article-title":"Effects of transmission gear selection on tractor performance and fuel costs during deep tillage operations","volume":"113","author":"Kichler","year":"2011","journal-title":"Soil Tillage Res."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/20\/9\/2450\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,13]],"date-time":"2025-10-13T13:51:18Z","timestamp":1760363478000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/20\/9\/2450"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2020,4,26]]},"references-count":72,"journal-issue":{"issue":"9","published-online":{"date-parts":[[2020,5]]}},"alternative-id":["s20092450"],"URL":"https:\/\/doi.org\/10.3390\/s20092450","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2020,4,26]]}}}