Study And Development Of A PDA-based Agricultural Fertilizer Expert System

Fertilizer recommendation technology is a mainly approach to realize the structural adjustment of agricultural production and precision agriculture, moreover, it concerns the agricultural production of our country whether or not to realize sustainable developing long time ago, fertilizer recommendation technology fails to make it available due to the lack of a fertilizer recommendation system suited for farmers. With the developing of information technology and microelectric technique, PDA technology, as a core of the embedded computer technology, has already been applied to lots of fields extensively. There are two operating systems for PDA, such as Windows CE and Palm OS. In order to make the PDA-based fertilizer expert systemdevelop easily, low price, more supported softwares and operate simply, we decide to choose PDA based on Palm OS to develop the PDA-based fertilizer expert system. For Palm OS operating system, we may use C ++ and C procedure language to develope it. Since Palm OS itself comes from application procedure interface of C language, the C language is the best one to design application procedure. Compared to use C ++ language, the application procedure of Palm OS compiled by C language saves time and energy; the developing cost is inexpensive too. So we choose C language to develop the procedure of PDA-based fertilizer expert system finally. The PDA-based fertilizer expert system comprises of seven major modules, included fertilizer expert system for wheat, cotton, rice, tobacco, corn, rape, information search system and expansion system etc. A expansion function of fertilizer expert system has been designed and embedded in PDA, according to the prompt on PDA windows, A user can input expert knowledge database of crop, so you canobtain a new crop fertilizer expert system. Operator inputs the datum of soil nutritions, inculded the content of organic matter, total N, available N, available P and available K, nutrient coefficients and type of fertilizers. PDA can provide the fertilizer scheme. According to the chosen type of fertilizer.The paper introduces that PDA technology applies in the agricultural fertilizer expert system. After analyzing the type and structure of PDA, and analyzing of developing trend of PDA, we make the plan of design for the PDA-based agricultural fertilizer expert system. Then we compile the program of the PDA-based agricultural fertilizer expert system. During the compiling of the procedure, we have used the computerized simulating methods and modularizing programmable technique in order to make the structure of program simply, well arranged and high efficiency, so it is easy to maintain the procedure. Beasuse the PDA expert system can distinguish the different crops and areas located for planting, and offer the scheme of fertilizer recommendation by it, it has solved the big problem that farmer can not scientific and rational apply fertilizer for a long time in planting. After using this system, the efficiency of fertilizer has been improved greatly.