According to the problems and trends in studying Agricultural Expert System (AES), this paper discusses principles and techniques of developing expert systems for crop production, and development of Web-based Rice Production Expert System (WRPES). WRPES uses the structure of Web Browser/Web Server/Database, and is built based on PAID4.0 which is a updated tool for Expert System (ES) building. It integrates theories, experiences and updated research fruits of experts which are authoritative in local
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