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Push forward with the process of the transformation of the mode of agricultural production and agricultural modernization, agricultural engineering disciplines applications is ever-expanding, and the mechanical properties of agricultural materials are widely used in various fields of agricultural engineering, basic theory, applications, experiments have made considerable progress progressive discovery and promotion of new technologies in agricultural engineering the stalk crops in the entire production, operating many technical issues related to the mechanical properties of the related crops, and therefore need to be basic and experimental research, understand the various physical parameters, mechanical properties, and to obtain the theoretical basis and characteristics of indicators available for the production of the actual reference. For stalk lodging problems crop, from the mechanical mechanism studied the the stalk crops biomechanics lodging characteristics, were three tall stalk, stalk and dwarf varieties of wheat as a test object, the use of physical and mechanical methods were biomechanical indicators will be measured in different growing season, wheat stem different section moment of inertia, modulus of elasticity, bending stiffness, flexural strength, shear strength, and come to the same growth during the period between the indicators along the section changes among the same section trends; indicators in different growth period and three varieties of wheat stem bending performance test data based Biomechanical evaluation of the characteristics of the wheat lodging. Grey Relational Analysis to study the different growth period between wheat stalk section II, moment of inertia, elastic modulus, bending stiffness, flexural strength, of each biomechanical bending performance indicators and lodging index of inter-related degrees. The results showed that the analysis of whether the use of such as the right to associate degrees, or weighted correlation degree analysis, the elastic modulus of the size of the association between various biomechanical indicators and lodging index sort are stem gt; flexural strength gt; moment of inertia gt ; flexural rigidity, which stem modulus of elasticity of the greatest impact on lodging index. Wheat lodging resistance evaluation to determine the weight of the wheat stem bending performance biomechanical indicators. Principle for determining the basis for the evaluation indicators, and through consultation, investigation, established four wheat stem bending performance evaluation were stem elastic modulus, flexural strength, moment of inertia, bending stiffness. Consider four indicators of wheat production, stem bending performance and its lodging resistance of the combined effect of the degree of the right to determine the four indicators, using the analytic hierarchy major small order 0.467,0.278,0.160,0.095 and Using the biomechanics indicators quantitative evaluation of lodging resistance of wheat. Stalk crops eugenic screening seek lodging ways mechanized production and deep processing of agricultural production and operating procedures of important guiding significance.
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