Analysis of Soil–Straw Movement Behavior in Saline–Alkali Soil Under Dual-Axis Rotary Tillage Based on EDEM

Zhuang Zhao, Jialin Hou (), Peng Guo, Chao Xia, Haipeng Yan and Dongwei Wang ()
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Zhuang Zhao: College of Mechanical and Electronic Engineering, Shandong Agricultural University, Taian 271018, China
Jialin Hou: College of Mechanical and Electronic Engineering, Shandong Agricultural University, Taian 271018, China
Peng Guo: College of Mechanical and Electronic Engineering, Shandong Agricultural University, Taian 271018, China
Chao Xia: Yellow River Delta Intelligent Agricultural Machinery Equipment Industry Research Academy, Dongying 257300, China
Haipeng Yan: Yellow River Delta Intelligent Agricultural Machinery Equipment Industry Research Academy, Dongying 257300, China
Dongwei Wang: Yellow River Delta Intelligent Agricultural Machinery Equipment Industry Research Academy, Dongying 257300, China

Agriculture, 2025, vol. 15, issue 3, 1-38

Abstract: The layered soil crushing rotary tillage machine with L-shaped reclamation rotary blades and rotary-reclamation rotary blades combination was designed to deal with the problems of a low soil fragmentation rate, low straw mulching rate, and poor surface leveling after plowing in the traditional rotary tiller tillage mode in the coastal saline land of the Yellow River Delta. A dual active layered soil fragmentation tillage mode was proposed, and the key structural parameters, blade axis arrangement, and spatial layout of L-shaped reclamation rotary blades and rotary-reclamation rotary blades were determined based on the sliding cutting principle analysis. A discrete element model of soil straw tillage component aggregates suitable for coastal saline alkali land was constructed using EDEM, and the influence of L-shaped reclamation rotary blades and rotary-reclamation rotary blades on the soil tillage layer displacement performance and straw burial performance of saline alkali land was comprehensively analyzed from a microscopic perspective. Taking the rotation speed of the L-shaped reclamation rotary blades, the rotation speed of the rotary-reclamation rotary blades, and the forward speed as experimental factors, and using soil fragmentation rate and straw burial rate as evaluation indicators for experimental optimization analysis, the optimal parameters were obtained: the rotation speed of the L-shaped reclamation rotary blades was 295.04 r/min, the rotation speed of the rotary-reclamation rotary blades was 359.06 r/min, and the forward speed was 3.12 km/h. At this time, the theoretical soil fragmentation rate of saline alkali land was 94.67%, and the straw burial rate was 93.56%. Field experiments have shown that the average soil fragmentation rate of the L-shaped reclamation rotary blades and rotary-reclamation rotary blades combined layered soil crushing rotary tiller after cultivation is 94.37%, the straw burial rate is 95.68%, the surface flatness is 25.82 mm, and the stability of the tillage depth is 95.64%. The machine has shown increased performance in comparison to traditional single axis rotary tillers, meeting the needs of crop bed preparation in saline alkali land.

Keywords: saline alkali soil; layered rotary tillage; straw mulching; discrete element method (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2025
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