A Simulation Study Of The Leaf Appearance Ang Tiller Dynamics Of Rice

Dynamic of rice leaf and tiller particularly close relationship, such as on the main stem of rice leaf growth dynamic model to understand the tiller dynamic process. The selection of 21 cultivars of rice by sowing time experiment, the main stem of a leaf extension for the effective temperature changes and clarify the main stem of the leaf and the extension of the effective temperature, and setting up the main stem of the dynamic the simulation model. Simulation in the leaf on the basis of further study the tiller dynamic in the relationship with the leaf. The main findings are as follows:1)Sowing dates to be different, main stem of the leaves also will be corresponding changes in the tested cultivars of the main stem of the leaves basically the same trend, with the performance of the sowing period postponed for the main stem of leaves reducing the number. But the main stem of different varieties to reduce the number of rice leaf of different varieties, photosensitive overall trend is stronger, its main stem of the leaves reduce the number of more. Sowing date on the section the internode of main stem the impact is different, some varieties such as yueguang and zhong you402 section of the internode few relatively stable, sowing period of almost no change in its impact, and while some varieties such as wujing15,miyang46, etc.The main stem internode of the sowing period by the number of larger, with the delayed sowing time, reduce the number of main stem of the leaves at the same time led to a number of internode sharp decline . These results suggest that, in the same region, the main stem of rice leaves can reflect changes in the number of varieties of light and temperature characteristics.2)The Leaf of the main stem extends with the effective accumulated temperature relations: cultivars and five sowing dates data, to get every leaf from the main stem elongation (referring to from the showing needle of rice leaf to fully open display) for the effective temperature. Analysis showed that the main stems and leaves of a stretch for the effective temperature for the different leaf has significant difference. Generally speaking, with the improvement of the position, a stretch of the main stem of the effective temperature for the increase. Further analysis of a stretch of the main stem of the effective temperature for leaf and the relationship between the different species that deal with different sowing dates of the main stem of the effective temperature to have turning point in the 3td and the N-n-2 leaf, clearly divided into three stages. Is the first stage of section 1 to section 3 of the leaf, with leaf improved, extended leaves of the effective temperature requirements similar to linear increase.In the second stage of Section 4 of the leaf to N-n-2, in the meantime, all of the requirements to stretch the effective temperature changes littlestage is from the N-n-1 leaf to flag leaf, in the meantime, the rose leaves with a stretch of the effective temperature requirements increase exponentially, cultars of the trial of five varieties sowing period observed by the inflection point of the related analysis of R² of 0.9853.3)Simulation model of leaf: According to the main stem of the leaves out the necessary extension of the effective temperature variation, leaf dynamic of the main stem was divides three sections of functionsto simulate, simulation function as follows.whichAnd b₂ is related parameter to the total leaf number of rice,whichis b₂ =α-βNWhich:EATPL mainly stem from the leaf extension effective temperature; Lt leaf age of main stem; N is the total leaf number of the main stem of rice; n is the number of internode, Tt is daily temperature, biological starting point for Tb temperature, a₁, a₂, a₃, b₁, b₂,α,βare parameters for the variter.Progressive inspection function the value of simulated and measured root mean square deviation (RMSE) are smaller, means the model is better. 4)Extends the relational theory according to tillers and leaves, when leaf age equale i,the tillers of per plant (T_i) may include the tillers ability the stem tiller number (T₁(i)) and does not have the tiller ability stem tiller number (T₂(i)) two parts. Namely: T_i=T₁(i)+T₂(i); Divides the tiller formation rate through various maturity degree of young plants time (r_i) to infer the stem tiller theory growth and the actual growth unified computation model.After peak tillers, through analyzes various maturity degree of young plants time to have 1, 2, 3 and 4 leaf tiller and the death speed, establishes the stem tillerwithering away model. T_i=T_N-n+2 - T⁽¹⁾V_i⁽¹⁾ - T⁽²⁾ V_i⁽²⁾- T⁽³⁾V_i⁽³⁾ - T⁽⁴⁾V_i⁽⁴⁾; In theformula T⁽⁴⁾,T⁽³⁾,T⁽²⁾,T⁽¹⁾ expressed separately has 4 leaves, 3 leaves, 2 leaves and 1 leaves stem tiller numbers. V_i⁽¹⁾,V_i⁽²⁾,V_i⁽³⁾,V_i⁽⁴⁾, expressed separately the peaktillers latter ith (i > N-n+3)leaf has 1,2,3 and 4 leaves tillers death speed. Demonstrated using this experiment's data to the model examination's result that the model can simulate the stem tiller growth and the declining tendency well.