Tillage force and disturbance characteristics of different geometric-shaped subsoilers via DEM
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Tillage force and disturbance characteristics of different geometric-shaped subsoilers via DEM Jin Tong1,2 • Xiao-Hu Jiang1,2 • Yue-Ming Wang1,2 • Yun-Hai Ma1,2 Jun-Wei Li1,3 • Ji-Yu Sun1,2
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Received: 25 November 2019 / Revised: 6 April 2020 / Accepted: 11 July 2020 / Published online: 12 August 2020 Ó Shanghai University and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract With the increased use of agricultural machinery in field operations, soil compaction has become increasingly severe, and the plough pan has become deeper. Subsoiling is an excellent way to address this problem. However, it is limited by high energy consumption, which is closely related to tillage force. To investigate the effect of the geometric shape of shanks and tines on tillage force and soil disturbance in loam, a layered soil model in accordance with the actual conditions was established and five different subsoilers were simulated via discrete element modeling. The results indicated that the shank impacted soil disturbance and tine impacted tillage force. The draft force of curved shank and chisel tine was 8% less than that of the straight shank and sweep tine. The straight shank and sweep tine produced a larger furrow profile and a higher furrow width. The subsoiler with curved shank and chisel tine (C-C) exhibited the lowest specific resistance (12.87, 17.52, 19.46 and 21.18 kN/m2 in the 30, 35, 40 and 45 cm tillage depth, respectively) considering the draft force and soil disturbance characteristics. Hence, these results will facilitate in the selection of a suitable subsoiler and design of new subsoilers with lower energy consumption requirements for loam areas worldwide.
& Ji-Yu Sun [email protected] 1
Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun 130022, People’s Republic of China
2
College of Biology and Agricultural Engineering, Jilin University, Changchun 130022, People’s Republic of China
3
College of Mechanical and Electrical Engineering, Shihezi University, Shihezi 832000, Xinjiang, People’s Republic of China
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Keywords Subsoiler Discrete element method (DEM) Tillage force Soil disturbance Soil compaction
1 Introduction Typically, there is a plough pan, under the cultivation depth, formed by the common action of agricultural machinery and tractor wheels [1]. Given that the use of heavy machinery from tillage to harvest continues and the trend of this practice continues to rise, the intensity of soil compaction increases along with the depth of the plough pan [2, 3]. Soil compaction causes a significant reduction in soil porosity and soil aeration, with a concomitant increase in soil bulk density [4, 5]. Hence, this is a major problem that reduces crop yield [6–8]. Subsoiling is a very effective method for solving such problems. The main reasons for this effectiveness are that a subsoiler can loosen the soil, break-up the plough pan, promote the growth of crop roots, and improve the ability of crops to absorb nutrients and water from the subsoil [9
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