Study On The Simulation Model Of Growth And Dry Matter Accumulation Of Pepper Under Different Irrigation Quartity

Main conclusion of this study is the simulation model of growth and dry matter accumulation of pepper under different water irrigation quartity, for maximum index is 100%, 90%, 80%, 70%, and minimum index is 60%. Under this theme, through systematic summarization of the achieved research result and current status related to crop growth and development model. Preliminary analysis and research was made to describe rationale, technique and method, practical application etc, especially for greenhouse crop model. On the basis of the relative research on the growth and development of pepper, and experiment in the plastic sheds and analysis indoors, I set up the simulation model of growth and dry matter accumulation of pepper under different water irrigation quartity. The concrete contents are as follows:It includes five models: developmental model, LAI model, dry matter accumulation model, nutrient absorption model and yield model and so on. Developmental model count the relative development and growth time make use of the three basic point temperature, threshold photoperiod and the optimum photoperiodic and it prescribe the time complete a specifically growing stage of pepper is in the lump of relative photoperiodic effectiveness. The model entrance three definitions, such as relative photoperiodic effectiveness, relative physiological development effectiveness and relative thermal effectiveness. It use sectioned function to count RPE, RPDE and RTE in developmental model, And simulated out the time from seedling stage to field planting stage, flowering and fruiting stage, fruit expansion stage, incipient stage of picking, fill stage of picking and final stage of picking need 92d, 106d, 128d, 146d, 180d and 188d. LAI model used classical Logistic mode LAI=LAI_m(1＋ae^-bt) to simulate the change of LAI, and it regulate planting time is 0, final stage of picking is 1, this unify the different time between four treating. Dry matter accumulation model depend physiological development time on horizontalabscissa, it uses curve to simulate dry matter accumulation for every apparatus of pepper. It actual description the rule of dry matter accumulation for every apparatus and it improve the explain and accuracy of the model. Dry matter accumulation model research N, P, K, nutrient accumulation in every apparatus under different dispose, and the exact time of Max absorption velocity of N, P, K. It depend on the accumulation to built yield model, that used for balance fertilizing in produce practice, and improves economic yield. The yield model used multivariate method to built model about yield per plant and N, P, K accumulation amount. The coefficient of determination R² is all above 85%, throw the analysis and test of SPSS, regression equation of five models achieve significance level. The models can be used in produce practice to. forecast yield per plant. The validity of models in dictate that the models can evaluate the growth stages, index of leaf areas, dry matter accumulation, nutrient absorption and yield. But because of the limitation experimental condition and time, there are still lots of work need to be done, such as experiment further validation, optimization of some parameters.