Study On Expert System For Water Saving Irrigation Of Rice In Pi-Shi-Hang Irrigation District

Starting with the basic principles of water saving irrigation (WSI), the author analyzed each parameter of irrigation forecast and posed the basis of WSI forecast, the expert system for water saving irrigation of rice in Pi-Shi-Hang irrigation district was designed by agricultural information platform 1.0(AIP1.0) developed by Heifei institute of intelligent machines, academy sciences of china. This system was designed with both the base of experts' knowledge and years of experience in rice production and computer soft ware, also the utilization of knowledge engineering and information technology. The organization and structure of this designed system includes six main pacts: knowledge base, data bank, model base, human computer interface, explanation unit, and reasoning unit. The knowledge base and reasoning unit are mutually independent and with considerably strong capacity of extension; the module structure enhances the system to be further extension and more perfect only by the extension and perfection of the specific module. Furthermore, this system, synthetically integrated with agricultural expert system, decision support system, as well as multimedia technology, is not only objective, imaginable, and friendly for human computer interface, but also simple to handle operate, easy to learn and understand. This system takes WINDOWS as its apply stage. Synthetic use of the mechanics of reasoning, prediction, and explanation is of meaning for serving and advising the customers to realize the decision of water saving cultivation and administration of rice. The function of this system includes possesses the following three modules: (1) decision-making of irrigation during ponding period This system is based on water depth of transplanting, infiltration volume, days, mean evaporation intensity and rainfall during ponding period to forecast irrigation quota during ponding period. (2) decision-making of irrigation during growing period This system is based on the depth of root system, dry unit weight of soil, upper limit index of irrigation and antecedent soil water to forecast irrigation quota;It is based on actual evapo-transpiration capacity, effective rainfall and water reserve of soil to forecast irrigation time. (3) Water saving irrigation beneficial analysis It includes economical beneficial analysis, social beneficial analysis and environmental beneficial analysis. This system has been checked and proved its precise and steady characters, and reached its original design requirements, it can provide scientific decision and consultation on water saving producing of rice for the irrigation district's farmers to save water and increase income.