Theory Of Utilization And Management Techniques Of The Farmland Water For High Efficiency

Agricultural water resource is a coupling system that the internal moisture depends on and cooperates with each other. Only adjusting the relations between soil- water-fertilizer-atmosphere and growth of crops to the optimum state can we tap the maximum inherent potentials of the resource system, exploit the agriculture water resources fully, reduce the input of outside resources and ultimately attain the objective of high grade, high yield, low consumption and high-effect.The moving and transformation rule of moisture in Soil-Plant-Atmosphere Continuum (SPAC) is the fundamental problem of modern agriculture research. And water-saving agriculture system is combined of that and water-saving irrigation, which is the basic way to achieve regulation of high-efficiency agriculture water use.It is of theoretical and practical significance in the production practice of water-saving agriculture to analyze the factors of atmospheric and soil moisture energy which restrict the use of field crop-water, to trace the field water movement process in each subsystem, to prove up the driving factor and water-saving mechanism and to seek the measures to regulate the process. It has gradually become the important researching direction in subjects of water conservation, agriculture, oil and environment and receives more and more attention from the domestic and foreign scholars.In this paper, researches on relevant theories and technology of high-efficiency utilization and management of field water were carried out systematically and creative achievement in the field of basic theory and applied techniques were made. The chief points are as follows:In this paper, through field experiments and indoor simulation experiments, the application foundation and technical issues of efficient use and management of field water were carried out systematically and thoroughly. The theoretical connotation of precise irrigation was set forth and precise irrigation technique system and its supporting system were constructed. Threshold auto-regressive model based on genetic algorithm for current paddy soil moisture forecast was put forward which conquered the instability and lower precision of the existing model and laid the foundation of irrigation forecast and the water-saving irrigation system. Field water management decision support system (FWDSS) integrated with data collection-transmission-processing-engineering controls was established which made scientific water management available through automatic data collection, analysis of automatic decision-making and automatic control operation. By the information entropy principle, space uncertainty analysis of soil macropore structure in the paddy field of water-saving irrigation were carried and the simulation and forecast accuracy of soil moisture characteristic curve and the...