Study On The Virtual Growth System Of Cotton Based On Morphologic Model

In this research based on the integration of domestic and overseas productioncorrelative to this study, whose object is cotton and basis is different nitrogen level andseedtime in 2005 and 2006, the morphologic model of main stem leaves, sympodial leaves,main stem, fruit branch and cotton boll were constructed based on effective cumulativetemperature by using the system analysis method and mathematical modeling technique,and integrating the quantificational connection of every organ's morphologic growth andthe major influencing factor of environment. And then the virtual development system ofcotton which is integrated based on morphologic model was constructed on the platforms ofVisual C++ by introducing the OpenGL system and using object-oriented program design.The results are as follows:1 The major effect factor model functionThe temperature, nitrogen, water and chemistry regulation effect factor model functionwere constructed using mathematical modeling method. The morphologic dynamicdevelopment of every organs of cotton which was influenced by environment effect factorscan be explained and reflected better by a series of effect factor model functions in practice.2 The morphologic model of stem, branch and leaf were constructedAccording to the potted data in 2005, based on the Logistic equation and took intoaccount the influence of Nitrogen, water and chemistry regulation, the morphologic modelsof organs such as main stem leaves, branch and sympodial leaves and fruit branch of cottonwere constructed whose drive variable is effective cumulative temperature(GDD). Themorphologic models were validated by research data of different varieties and fertilizer in2006. The result showed that the value of RMSE of cotton stem, branch and leafmorphologic model was 0.66cm(n=118),0.87cm(n=118),0.77cm(n=118),0.57cm(n=111),0.77mm(n=111),0.43cm(n=107),0.55cm(n=107),0.43cm(n=107),0.73cm(n=130)0.16mm(n=130), which showed sufficiently that the simulated value andthe observed value of cotton' stem, branch and leaf morphologic model were anastomosedbetter, the simulation of cotton organ's morphologic model was accurate and the predictionwere better. 3 The morphologic model of cotton boll was constructedBased on the potted data in 2005, the cotton boll was divide into two parts:length anddiameter to be analyzed statistically. Then using the leading line of effective cumulativetemperature(GDD), the dynamic diversification relationship between length, diameter ofcotton boll and effective cumulative temperature was quantitied. The morphologic modelsof cotton boll's length and diameter were constructed by using Logistic equation, and themodels were validated by research data of different varieties and fertilizer in 2006. Theresult showed that the value of RMSE of cotton boll's morphologic model were 0.39cm(n=110) and 0.4cm(n=110), The precision and prediction were better. On this basis,the morphologic model of cotton boll's volume was constructed according to the linearityconnection of cotton boll's volume, length and diameter.4 The virtual display model of cotton organ was constructedBased on the morphologic character of each organ, the virtual model of leaf and cottonboll were constructed using OpenGL function and MURBS curve, and the virtual displaymodel of main stem internode and fruit node were constructed using quadratic curve-cylinder in this study firstly. Then according to the topology structure, the virtual displaymodel of each organ were integrated, and the virtual display model of entire cotton wasconstructed. The display effect showed that the feasibility and practicability of this modelwas better.5 The virtual growth system of cotton was constructed based on morphologic modelThe virtual growth system of cotton based on morphologic model (VGSBCMM) wasconstructed by using the system analysis method, using the programme language ofVC++6.0 which is object-oriented, using VB 6.0 to empolder interface, and using Access2000 to design the table of data. This system included man-machine interface,database,morphologic model database, virtual output module and scene control module. With theexcellence of system, dynamic, mechanism and prediction, this system can manage thepredictable data of cotton, predict organ's morphologic growth, do dynamic ramble and soon. The established system complemented the cotton growth model, and lay a foundationfor the development of figure cotton crop.