Potato And Its Simulation Of Root Growth

The simulation of the potato's underground organization is one aspect of the simulation of virtual root system.The important work of virtual root system simulation is to research root architecture. The root architecture is the three-dimensional shape and distribution of the root in its growth medium,as the root system grows in opaque soil,it is difficult to observe or analyze it, so it makes simulation model become an important supplementary method to research relevant issues. The computer simulation system of root architecture has a larger value,besides academically using it to discuss the kenel and structure analysis of the plant root system, in agricultural production application, with the simulation system of the root growth pattern,we can make quantitative analysis and reveal the effect of the soil condition on the crop growth.An important application field of the root architecture's simulation system is to accomplish visualization for roots growth process in the soil.And it makes the researchers to get the information easily on how the root grows in the soil,and enhances the convenience of research methods.Using the predictability of simulation model to identify ideal root architrcture of the plant which adapts to the soil environment,we can get theoretical basis to breed or introduct good quality and high-yielding varieties.Through searching a large number of documents,we found that many study on virtual root system was focused on tap root system or fibrous root system,which were both composed with relatively simple roots. But few details about the growth process of the potato's underground organization, which has complicated stem or root,are included.In this case, considering the potato has become one of the high-performance crop which has the largest area in Yunnan Province, we will do some research on the growth situation of potato's underground organization. This paper has finished some works as follows:First, we collected samples in field, plant potatoes in the laboratory,and then analysised the growth situation of the potato's underground organization during different growth stages,and determined its underground's architecture characteristics:when the subterranean stem grows about 60 days,it will branches 3-4 creeping rootstocks and 1 creeping stem. When the creeping stem grows to about 2cm long,it will stop growing to form a tuber by expansion in the tip.Subsequently,the tubers will increase its size,until to form mature potatoes. Many important parameters for model are required by practical measuring and image processing with computer. Furthermore, in order to get a comprehensive understanding of growth pattern for the potato's underground organization,we also carried out some related curve-fitting jobs.Secondly, we established the three-dimensional Solid model for subterranean stem,creeping rootstock,creeping stem according to geometric construction modeling method. We generate stem tuber just like draw a circle, process spherical coordinate at random, and then completed it with two-dimension Texture-mapping.Finally,by using dynamic tree-based data structure and recursive traversal method,we developed three-dimensional visualized simulation software,which is made by Visual C++ language and powerful OpenGL graphic library,to display real-time three-dimensional graph of the potato's underground organization. Moreover,you can also get some related geometric parameters in its interface.According to the measured parameters, it can display the growth pattern and architecture characterstic of the potato's underground organization in the computer.The simulation system we got can meet the requirements of visualization basically,and the process and result of simulation is correspond with the real growth state of the potato's underground organization,so it illustrates the established simulation system effective. The method we proposed about growth modeling and simulation has preferably universality, and can be widely applied to the growth simulation for other kinds of potatoes's underground organization.