The Effect Of Soil Compaction On Upland Rice Seedling Stage And Its Visual Modeling

Researching the relationship between upland rice growth and soil compaction degree has guiding significance to improve upland rice yield. Studying the effect of soil compaction on upland rice seedling growth is the major work of this paper.It is one of the most important methods that using dynamic simulation for the growth of upland rice which growing in different degrees of compaction of the soil, to reflect the influence of different soil compaction on plant growth using digital image processing technology and virtual plant modeling method. Bulk density was used as a measuring index of soil compaction in this paper, using soil compaction device to suppress different bulk density of soil bowl. Upland rice potted experiment was carried out to research the soil compaction effect on upland rice seedling growth and development. Aiming at getting the biology characteristic of time series and the horizontal contrast observation data during the same period about the experimental materials in situ observation experiment and destructive sampling experiment, image analysis software based on MATLAB platform was developed in this paper. In this software, method combining between OTSU threshold segmentation algorithm, mathematical morphology operation and connected domain detection, and denoising algorithm was proposed firstly to realize the image segmentation. Then applying area computation algorithm based on pixel statistics and the length, width measurement algorithm based on minimum external rectangle was presented to extract the upland rice image morphological features.The relationship between soil bulk density and upland rice seedling agronomic traits was analyzed through using the interpolation method, analysis of variance, correlation analysis, as well as regression analysis method.Results show that soil compaction within the range of bulk density has a significant influence on upland rice seedling growth. And the influence of soil compaction on upland rice root system is earlier than its impact on the aerial parts of the upland rice. Root number, root length, and root dry weight is negatively related to the soil bulk density. The growth of leaf area and plant height is also negatively related to the density. The above results indicate that the high soil compaction has sustained inhibitory effect on upland rice seedling growth. And due to the effect of soil compaction, the development of root system is limited and restricted firstly, then reflected in the aerial parts of upland rice after a period of time.In order to simulate the process of soil compaction effect on upland rice, this article constructed the upland rice plant growth machine model, and completed the visualization of upland rice by combing pot experiment with virtual plant simulation method. A kind of3d dynamic simulation system of upland rice based on Mesa graphics library and Linux system was designed by using c plus language. The3d dynamic simulation of upland rice seedling growth process was also implemented. During the process of assessing the system simulation precision, the similarity between the simulation model of upland rice and the actual plant on the morphological characteristics, as well as the degree of closeness between system output parameters and the actual data of upland rice were used as the assessing standards. The results show that comparing the visual model and actual plant of upland rice, the above ground parts were similar while the underground parts were different. Results of error analysis regarding upland rice height, area, and the number of roots demonstrate that the relative error between simulation data and the actual measured data is small, less than10%.