Aboveground Morphological Structure Models Based On Biomass Of Winter Wheat After Overwintering

With the integration of information science and agricultural science,digital agriculture has become an important technical support for the development of modern agriculture.Digital agriculture plays an important role in improving the efficiency of agricultural production,improving the quality of agricultural products and protecting agricultural environment.Virtual crop is an important application of digital agriculture,which provides technical support for the analysis of crop structure and function,the design of ideal plant type and the regulation of growth mode.This study uses system analysis method,combined with the wheat growth model output,based on the biomass of wheat organ morphological,and constructs the morphology model of wheat organ.Based on the experimental observations of the high tech Industrial Park of Tianjin Academy of Agricultural Sciences from 2015 to 2016,the relationship between the variation of specific leaf weight,leaf length and leaf width of three varieties of wheat was analyzed.The results showed that the variation law of specific leaf weight with leaf position could be expressed by the two equation of one element,and the variation of leaf length with leaf width had significant difference between flag leaf and other leaf positions.Combined with the output of the growth model,a simulation model of leaf morphology based on biomass was constructed.Test data of model shows that the simulation value and root mean square deviation(RMSE)of the measured values of leaf length were 1.780 cm and 0.127 cm,the geometrical properties model can simulate leaf morphology of different wheat varieties.In this paper,the variation law of the length of leaf sheath and the dry matter weight of leaf sheath and the change of the ratio of leaf dry matter weight to the expanded area were analyzed.The results show that the variation of dry leaf sheath length with the available exponential function equation of heavy,dry weight and leaf area ratio with the variation of leaf position and effective temperature are available for multivariate nonlinear function equation.Based on the biomass of the growth model,a simulation model of leaf sheath morphology was constructed.Test data of the models indicated that the length and width of leaf sheath of the root mean square deviation(RMSE)were 0.731 cm and 0.324 cm,which can simulate the geometric properties of different varieties of wheat sheath morphology.At the same time,this paper analyzed the variation law of stem length of wheat with internode position and stem dry weight,and the variation of stem density with logarithm of internode position and effective accumulated temperature.The results showed that the variation law of stem length with the internode position and stem weight and the logarithm of stem density with internode position and effective accumulated temperature could be expressed by the nonlinear function equation.Based on the biomass of the growth model,the simulation model of the stem was constructed.The test results show that the root mean square deviation(RMSE)of stem length and diameter are 0.968 cm and 0.051 cm,and the model can simulate the geometric properties of different wheat stems.In addition,the variation law of dry matter weight of wheat ear thickness with the width of wheat ear were analyzed.The results showed that the variation law of dry matter weight of wheat ear thickness with the width of wheat ear could be expressed by the exponential function equation.According to the biomass of the growth model,the simulation model of wheat was constructed.The test data shows that the width,thickness and length of the root mean square deviation(RMSE)were 0.067 cm,0.048 cm and 0.449 cm,and the model can simulate the geometric properties of wheat ear...