| ABBRIVATIONS | 第1-8页 |
| ABSTRACT | 第8-10页 |
| 摘要 | 第10-12页 |
| CHAPTER 1 INTRODUCTION | 第12-48页 |
| ·Back Ground | 第12页 |
| ·Significanoe of research | 第12-15页 |
| ·Review Literature | 第15-34页 |
| ·Effect of tillage practices on straw incorporation soil | 第15-16页 |
| ·Physical and mechanical properties of soil | 第16-18页 |
| ·Horizontal forces of tillage tool | 第18-20页 |
| ·Vertical forces of tillage tool | 第20-21页 |
| ·Soil disturbance and soil failure geometry by tillage tool | 第21-24页 |
| ·Soil bulk density influenced by tillage tool | 第24页 |
| ·Soil and straw movement by tillage | 第24-27页 |
| ·Relationship of draft and speed | 第27-29页 |
| ·Relationship of draft and depth | 第29-30页 |
| ·Soil-Bins Indoor and outdoor | 第30-34页 |
| ·Objectives of the research | 第34页 |
| ·Layout of the dissertation | 第34-36页 |
| REFERENCES | 第36-48页 |
| CHAPTER 2 MATERIALS AND METHODS | 第48-74页 |
| ·Mechanical characteristics of straw | 第49-55页 |
| ·Experimental method and design | 第49页 |
| ·Moisture content of straw | 第49页 |
| ·Straw internode preparation | 第49-50页 |
| ·Test equipment | 第50-51页 |
| ·Fabrication of shear box and loading plate | 第51-52页 |
| ·Shear,cutting and bending tests | 第52-55页 |
| ·Statistical analysis | 第55页 |
| ·Soil-bin experiments were categorized by two approaches | 第55-72页 |
| ·Experimental design | 第55-56页 |
| ·Testing facilities and soil-bin preparation | 第56-57页 |
| ·Soil Preparation | 第57-58页 |
| ·Measurements of scil properties | 第58-59页 |
| ·Soil moisture content | 第59页 |
| ·Soil bulk density | 第59-60页 |
| ·Direct Shear test | 第60-62页 |
| ·Assembling of disc tool and transducer placement | 第62页 |
| ·Soil cone index | 第62-63页 |
| ·Soil disturbance area and furrow profile | 第63页 |
| ·Soil and straw movement | 第63-66页 |
| ·Burial straw measurements | 第66-68页 |
| ·Transducer calibration and data acquisition system | 第68-71页 |
| ·Statistically analysis | 第71-72页 |
| REFERENCES | 第72-74页 |
| CHAPTER 3 EFFECT OF LOADING RATES ON MECHANICAL CHARACTERISTICS OFWHEAT AND RICE STRAW | 第74-92页 |
| ·Introduction | 第74-75页 |
| ·Results and discussion | 第75-87页 |
| ·Effect of loading rate on shear strength | 第75-79页 |
| ·Effect of loading rate on specific shearing energy | 第79-81页 |
| ·Effect of loading rate on cutting force of straw | 第81-83页 |
| ·Effect of loading rate on bending strength | 第83-84页 |
| ·Effect of loading rate on shearing energy | 第84-86页 |
| ·Effect of loading rate on young's modulus | 第86-87页 |
| ·Conclusions | 第87-89页 |
| REFERENCES | 第89-92页 |
| CHAPTER 4 STRAW-SOIL-TILLAGE TOOL INTERACTION:A CASE STUDY FOR DISCTOOL | 第92-108页 |
| ·Introduction | 第92-93页 |
| ·Experimental design and statistical analysis | 第93页 |
| ·Result and discussion | 第93-103页 |
| ·Forces acting on disc tool | 第93-98页 |
| ·Burial straw after disc tillage tool | 第98-101页 |
| ·Soil bulk density influenced by disc tool | 第101页 |
| ·Soil disturbance area and furrow profile | 第101-103页 |
| ·Conclusions | 第103-104页 |
| REFERENCES | 第104-108页 |
| CHAPTER 5 STRAW AND SOIL MOVEMENT UNDER DIFFERENT WORKING DEPTHSAND SPEEDS OF DISC TOOL | 第108-126页 |
| ·Introduction | 第108-109页 |
| ·Results and Discussions | 第109-123页 |
| ·Lateral and longitudinal soil movement at different speeds and depths | 第109-114页 |
| ·Lateral and longitudinal straw movement at different speed and depths by disc tillage tool | 第114-123页 |
| ·Conclusions | 第123-124页 |
| REFERENCES | 第124-126页 |
| CHAPTER 6 SIMULATION AND MODELING OF STRAW-SOIL-DISC TOOL THROUGHEDEM | 第126-136页 |
| ·Introduction | 第126-127页 |
| ·Discrete element constitutive model and calculation principles | 第127-129页 |
| ·Result and discussion | 第129-134页 |
| ·Conelusions | 第134-135页 |
| REFERENCES | 第135-136页 |
| CHAPTER 7 CONCLUSIONS AND RECOMMENDATIONS | 第136-140页 |
| ·Conclusions | 第136-138页 |
| ·Mechanical characteristics properties of straw | 第136-137页 |
| ·Straw-soil-disc toolinteraction | 第137页 |
| ·Soil and straw movement | 第137-138页 |
| ·Simulation of straw-soil-disc tool by EDEM | 第138页 |
| ·Recommendations | 第138-140页 |
| PHOTOGRAPHS | 第140-148页 |
| RESEARCH PAPERS | 第148-150页 |
| ACKNOWLEDGEMENTS | 第150-151页 |
| DEDICATION | 第151页 |
