Soil Compaction Impact On The Growth Of Upland Rice And Visualization Under The Condition Of Water-Soil Segmentation

The role of soil compaction on upland rice by modeling and simulating the growth of upland rice tissue in different conditions of water-soil segmentations has been studied in this paper. Relying on the National Natural Science Fund Project(60971115),"Modeling and Dynamic Simulation of Soil Compaction Effect on Plant Underground Tissue Architecture", the paper belongs to the research field of virtual plant.Upland rice, which has the characteristics of strong drought tolerance and little water requirement, is the best grain crop to implement water-saving and dry land farming. The growth environment of upland rice is different with rice, which most of upland rice needs to be planted in the drought mountain. The growth status of upland rice is not only related to nutrient and moisture of soil, but also affected by the physical and chemical properties of soil. Therefore, understanding the growth rule of upland rice under the soil compaction, so as to identify reasonable soil compaction scope which is suitable for the growth of upland rice, can help provide scientific basis for upland rice planting.This study is mainly composed of two parts:modeling and visualization of upland rice and upland rice cultivation experiments. Firstly, the growth of upland rice under the soil compaction was analyzed. The computer visualization simulation based on the growth rules of upland rice tissues was conducted in accordance with predicted results. On the other hand, the upland rice cultivation experiment was carried out in the water-soil segmentation devices. The actual growing status and rules under different soil compaction conditions were observed and recorded. The accuracy and stability of upland rice simulation model has been verified by comparing the experimental data with simulated data of upland rice tissues.In the part of modeling and visualization, Growth model, visualization model and statistics model were developed. VC++6.0platform and Simroot graphic interface were used to design the visual simulation system of the dynamic growth of upland rice. By inputing the geometric and growth parameters of the upland rice, the system outputs3D visualization and numerical simulation results.In the part of upland rice cultivation experiments, the Equipment of water-soil segmentation has been designed. This device includes bearing soil device and the water container. When experimenting, it is important to keep distance between bearing soil device grid and the water container so as to separate the soil and the water. The soil compaction effect on the growth speed of upland rice root can be determined according to the time the root passing through the grid. The growth status of the upland rice under different soil compactions can also be observed through measuring the root volume, root weight, root growing area. Besides, the impacts on upland rice aerial part under different soil compaction conditions were analyzed as well. The upland rice4was used in the cultivation experiment, which the soil compaction was measured by soil bulk density. The morphological features and tissue parameters under different soil compaction degrees were obtained.The results of cultivation experiment and computer simulation indicated that soil compaction has an effect on both the growth of upland rice aerial part and underground part. Root system of axial growth speed, adventitious root rooting speed, root growing area, root volume, stem growing speed were decreased with the increase of soil compaction degree. Likewise, when the soil bulk density equals1.3g/cm3, it is advantageous to the upland rice tillering and leaf growing. In comparison to the experimental data and simulated data, the simulation system designed is accurate, which can provide numerical simulation analysis on the dynamic growing process of upland rice root, stem, and leaf tissue. Furthermore, this simulation model can also be used for analyzing the soil environmental effect on the other root plants.This study enriched the theoretical basis of the structure and function of the plant-soil system. The soil compaction effect on the plant growth was analyzed by using a new water-soil segmentation device. Thus, a new method to research the relationship between soil compaction and plant growth was presented.