Wheat Stalks Of The Late Development Lodging-resistance Mathematical Model Analysis

Lodging in wheat is restricted high yield and high quality one of the main factors.In recent years, due to the different approaches to wheat high yield, thesuper-high-yield study, the number of wheat increased to a new level, will bring thestem load force and lodging. So the stem KangDaoXing research wheat caused thedomestic and foreign many researchers attention. In the production practice, the stemlodging cause is the main cause of wheat production. This paper mainly rely on intoday’s wheat new research method, that is, through the physical mechanics researchwheat resistance of analogy of lodging, around the stem lodging index formula,namely the stem lodging index=stem fresh weight×stem height/stem gravitymechanical strength, through the optimization of the formula, full and effective use ofappendix to provide the data, then build up reasonable mathematical model, so as tosolve the problem.First of all, the first ask the solving process,2007years of wheat stem lodgingindex can directly for the use of a given formula, can calculate lodging index. But2008years of data only given the long stalks, thick and wall thickness, and not giventhe stalks fresh weight, center of gravity high, stem mechanical strength data.Through the fresh weight and the relationship between the dry weight, can get freshweight of wheat. Through the pressure of the bar bent critical force, established thewheat mechanical strength model. Pressure bar bent critical force effective and stemlong, thick indices such as organic unifies in together, through the physical potentialenergy conservation for the center of gravity of the stem. For the2011provides wheatpulling force values, and other physical parameters, we establish and tension on thestem of the value and shape the features of the mathematical model, the last twomodel for lodging index, by comparing the results of the two models, more fullyshows the correctness of the model.Secondly, the lodging index and external form features stronger relationship,namely lodging index and plant height, spike length, base the second quarter of therelationship between the rough, etc, mainly discuss lodging index and these externalmorphological characteristics of the linear correlation between, through the MATLABfor the correlation analysis, it is concluded that the more reasonable quantitative correlation indexes, the wheat stalks after external morphological characteristics ofresearch has certain directive significance.Third, the optimization of the adopted in this paper to solve the orders of idealplant type ear heavy wheat structure. The appendix collection a batch of all kinds ofwheat stalks of character, the production data, lodging, and, to some extent, thesefigures reflected the wheat to lodging index and wheat plant height, spike length, allinternode length, wall thickness of the stem charactersThe relationship between. At the same time in a large number of datameasurement, some wheat resistance of lodging ability is very good, their structure inthe collected limited data range, can think of is the ideal plant type. Based on theprinciple, we adopt the optimization of the gradually, received a spikelets wheat underthe ideal plant type structure.Fourth, will be according to the elastic material handling the stem, the wheatstalks of grain weight and wind load in under the basic rules of stress. Through grainweight to the stress analysis, it is concluded that the reasonable wheat stem lodgingindex mathematical model. And the wind is a random load, its size, direction andchange over time, but the role of wheat can think is a kind of typical explosion load,its initial value is very big, and then diminishes quickly. Through this kind of move tothe wind load analysis, and it established the reasonable wheat stem lodgingmathematical model was, at the same time also use this model calculated the2007data of the wax ripe period of the varieties lodging-resistance wind speeds.Finally, based on the results of this paper analyzes and summarizes the, putsforward some problems to be considered, and to wheat breeding in breeding practicehome put forward reasonable Suggestions.