Barley Growth Simulation Model And Visualized Realization On Field Experiments

Based on the field experiments in this study, barley morphological characteristics of organswere observed under the different Nitrogen conditions, and based on the growth processes inseveral barley variaties of Gansu. With the effective accumulative temperature as the key factorof barley growing development, the growth and developmental simulation model of the barleyleaf and stem were constructed. And then based on the form model of the constructed，severalparameter-based geometrical model for organs were constructed by the method of NURBSsurface. Based on constructed morphologic models and on object-oriented Visual C++programplatform combining with the OpenGL system，the leaf and stem visualization were carriedout.The results are as follows.In this paper, the Gansu barley morphological modeling and visualized realization wereshowen in the following：(1) On the basis of the field experiments, according to the variation of the barley plantmorphological structure and the introduction of nitrogen levels, using the method of the logisticmodel, the development of the barley stem and leaf growth models were simulated. Whichincluded barley stem length and stem thick model;,sheath length model; leaf length,andleafshape model. The model test results showed that,the proposed time variable GDD hadhighersimulation accuracy and better descriptive on barley organ growth in the real environment.(2) Based on the barley different organs growth model, the various barley three-dimensionalgeometry organs were simulated using the NUBRS surface modeling. The blade geometrymodel, the leaf geometric model, the sheath geometric model and the stem geometric modelwere constructed separately. With the computer graphic treatmental technology, the createdgeometric models were given a series of real treatments, including texture mapping, colorrendering and light treatment, which laid the foundation for the model visualization.(3) Based on the WINDOWS platform and VC++programming system, and combined withOpenGL graphics development platform, a barley visualization system was initiallyestablished. The system was coupled with the barley form growth model and the barley organsvisualization model, which realized both the barley organs growth dynamic display and thebarley individual growth dynamic display. The published papers showed that the barley growth modeling and visualization is stillfar less at home and abroad up to now, therefore the experimental study with selected threebarley varieties in Gansu, provides a strong technological support and cultivated progress forthe whole northwest region of barley.