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| Three-dimensional growth modelling and realization for potted tomato root system |
| Ji Ronghua1, Li Xiang1, Qi Lijun2,3, Wang Jianqin1 |
| 1.College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China; 2.College of Engineering, China Agricultural University, Beijing 100083, China; 3.Optimize the Design of Modern Agricultural Equipment Key Laboratory of Beijing, Beijing 100083, China |
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Abstract In order to explore the distribution characteristics of potted tomato root system under negative pressure underground irrigation, the three-dimensional spatial coordinates and growth parameters of tomato roots are measured at different growth stages. After analyzed the experimental data, the root growth function, lateral point distribution, lateral root birth probability and orientation are clarified. The differen-tial L-system is proposed to describe the tomato root growth model and boundary conditions based on the root topological pattern and actual growth situation. OpenGL technique is used to realize the three-dimensional visualization simulation system for potted tomato root growth, consequently, the root spatial distribution and growth state can be reconstructed intuitively under negative pressure underground irrigation. It is shown that the averaged fitness of root tip position distribution is about 83% in seedling stage but is approximate 91% in fruiting stage compared with experimental data. Hence the growth model generated can effectively simulate the growth of potted tomato root system. The differential L-system based model can exhibit the morphological characteristics and growth characteristics of potted tomato root system at different growth stages precisely. The results may form a base for forthcoming study on interaction between soil moisture and root system growth.
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Received: 06 November 2014
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