声明
ABSTRACT
摘要
TABLE OF CONTENT
LIST OF FIGURES
ABBREVIATIONS
LIST OF SYMBOLS
CHAPTER 1 INTRODUCTION
1.1 VEGETABLE TRANSPLANTING lN DEVELOPING COUNTRIES
1.2 PICK-UP END EFFECTOR RESEARCH FOR AUTOMATIC TRANS-PLANTERS
1.2.1 Current level and trends in pick-up end-effector designs in China and other countries
1.2.2 Key bottlenecks in the design of pick-up devices
1.3 HISTORY OF X-RAY COMPUTED TOMOGRAPHY IN SOIL-PLANT RESEARCH
1.4 PRINCIPLE AND GUIDELINES OF OPERATION OF CT IN SOIL RESEARCH
1.5 APPLYING CT FOR IMAGING SOIL-ROOT PHYSICAL AND BIOLOG-ICAL PROCESSES
1.5.1 Trends in using CT for soil-root investigations
1.5.2 Root architecture imaging
1.5.3 Soil compaction and structure deformations
1.5.4 Soil-roots hydraulic interactions
1.5.5 Soil-root biological processes
1.6 SIGNIFICANCE AND OBJECTIVES OF THE STUDY
1.7 MAIN CONTENT AND DISSERTATION ORGANIZATION
CHAPTER 2 COMBINING X-RAY COMPUTED TOMOGRAPHY AND RELEVANT TECHNIQUES FOR ANALYZING SOIL-ROOT DYNAMICS-AN OVERVIEW
2.1 INTRODUCTION
2.2 APPLICATIONS OF CT AND OTHERTECHNIOUES IN SOIL AND ROOT STUDIES
2.2.1 Soil Hydraulic and Structural Dynamics
2.2.2 Root network imaging
2.2.3 Modeling and CT experimental work on root-soil interactions
2.2.4 Detection of organic matter
2.3 ADVANTAGES AND LIMITATION OF COUPLING CT WITH OTHER TECHNIQUES
2.4 ADDITIONAL TRENDS AND OUTLOOK
CHAPTER 3 ASSESSMENT OF TOMATO SEEDLING SUB-STRATE-ROOT QUALITY USING X-RAY MICRO-COMPUTED TOMOGRAPHY
3.1 INTRODUCTION
3.2 MATERIALS AND METHODS
3.2.1 Main instrument/facility used in the study
3.2.2 Experimental procedure and data acquisition
3.4 RESULTS AND DISCUSSION
3.4.1 Ground data on tomato seedlings
3.4.2 Three dimensional strueture visualization and estimation of root feature analysis
3.4.3 Porosity analysis
3.4.4 Finite element analysis of substrate-roots
3.5 SUMMARY
CHAPTER 4 SUBSTRATE-ROOT NUTRIENT ELEMENT ANAL-YSES AND WATER APPLICATION EFFECT ON SEEDLING GROWTH
4.1 INTRODUCTION
4.2 MATERIALS AND METHODS
4.2.1 Experiments
4.2.2 Statistical Analysis
4.3 RESULTS AND DISCUSSION
4.3.1 SEM Structures and nutrient analyses
4.3.2.Cluster analyses and correlation between nutrient elements
4.3.3 Effect of three water appfications on the growth and development of seedlings
4.4 SUMMARY
CHAPTER 5 MODELING AND MECHANICAL PERFORMANCE OF SEEDLING SUBSTRATE-ROOTS
5.1 INTRODUCTION
5.2 MATERIALS AND METHODS
5.2.1 Model Development
5.2.2 Soil-root mechanical model
5.3 MODEL SIMULATIONS
5.4 EXPERIMENTS
5.4.1 Experiment on root growth of tomato seedlings
5.4.2 Compression experiments on tomato roots and substrates
5.5 RESULTS AND DISCUSSION
5.5.1 Mechanical Properties of Soil-roots
5.5.2 Force-displacement analysis of seedling soil-roots
CHAPTER 6 INVESTIGATIoNS INTO SEEDLING SUBSTRATE GRIPPING FORCEDAMAGE
6.1 INTRODUCTION
6.2 FORCE GRIPPING DAMAGE EQUATION
6.2.1 Equation for estimating damage
6.3 EXPERIMENTS
6.3.1 Seedling growth conditions
6.3.2 Force application on the seedling soil
6.3.3 Laboratory experiments
6.3.4 Damage investigation/inspection
6.4 RESULTS AND DISCUSSION
6.4.1 Seedling soil damage imaging and morphometry under different force treatments
6.4.2 Physical and mechanical properties of soil damage
6.5 SUMMARY
CHAPTER 7 ANALYSES AND OPTIMIZATION OF PICK-UP SUCCESS RATIO IN TRANSPLANTING
7.1 INTRODUCTION
7.2 ANALYSIS OF PICl(-UP DEⅥCE IN PICKING UP SEEDL玎呵GS
7.2.1 Pick-up trajectory and motion planning
7.3 MODAL ANALYSIS
7.3.1 Governing equations for the modal analysis of the pick-up end-effector
7.3.2 Experimental and finite element simulation methods
7.3.3 Simulation by ANSYS Workbench
7.4 CONSIDERATIONS FOR THE DESIGN OF PICK-UP ENDEFFECTORS
7.4.1 Substrate type and pick-up relationship
7.4.2 Root properties and pick-up relationship
7.4.3 Damage and pick-up relationship
7.5 OPTIMIZATION OF SUCCESS RATIO IN TRANSPLANTING SEED-LINGS
7.6 SUMMARY
CHAPTER 8 GENERAL CONCLUSIONS,INNOVATION AND RECOMMENDATIONS
8.1 GENERAL CONCLUSIONS
8.2 INNOVATIONS/NOVELTY
8.3 RECOMMENDATIONS FOR FUTURE WORK
REFERENCES
ACKNOWLEDGEMENT
PUBLICATIONS