A database of malting barley crossing records was developed using Prolog-KABA interpreter for a personal computer. Breeding lines change their names in breeding progress. Data of old name were also included in the database. By simple programming in Prolog, it was possible to draw pedigree trees, to count the number of ancestors and to compute the relationships among cultivars. Fifty one lines were developed from 1974 to 1992 for regional adaptability test by Fukuoka Agricultural Research Center. All crossing records included in these lines were assembled and the perfect pedigree trees were drawn for them.
’Golden melon’ was one of the malting barley cultivars introduced and cultivated extensively in the late 19th century of Japan. Early cultivars were developed from the crossings between Golden melon and some indigenous lines or between pure line selections of Golden melon. Later, crossings of malting barley in Japan were, essentially, among lines developed in the previous cycles, though a few genes were introduced for specific breeding objectives as BaYMV resistance, powdery mildew resistance or high diastatic power. The database showed that 1) lines developed recently were about 10-th generation's from Golden melon, 2) the number of original cultivars contributing them was only 10-14, 3) the coefficients of relationship between Golden melon and them are large and the values are about 40%, and 4) the gene pool of malting barley in Japan was extremely narrow.

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The author developed a generalized computer program for input, which can be used for developing the various agricultural softwares. Generally speaking, as there are many databases which have the special format of the spread-sheet style, the developed program is characterized by the tabular style system for inputting the data, which fulfils the many functions for editting the data. And also, in the system, several convenient functions for spread-sheet calculations and simulations are included. These tabular style inputting data-sheet can be distinguished by a table-setting database which can be made easily. Therefore users of the system can compose an original system quickly as they like it. The flow chart of this program is shown in figure 2 and some executed examples are shown in from figure 3 to 5.
The system is developed by using the C language (Microsoft C Version 5.1), and can be executed using the NEC 9801 series personal computers.

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Database management system has not always complete value to applicate database for an individual practical purpose. We need something interfacial to combine database with persons, to try to applicate it for a certain purpose. As one of the examples, this paper presents a design of interface system to applicate climate data for agricultural research.

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The Internet information services based on the hyper-text system called WWW (World Wide Web) are growing very quicly, because the system development of such services is comparatively easy. The WWW systems are served by the combination of server softwares (eg.NCSA httpd) and markup-languages (eg.HTML). People can use those services by the browser software (eg.NCSA Mosaic) of the cliants on the Intemet. At present, most of the WWW information is given in a page-unit style. In the case, we can access the information we need only page-to-page link. That is, the more information increases at site, the more it becomes difficult to find what we really need at the site. In this study, to solve such a problem, we developed a retrieval system on WWW. The retrieval system is based on the FORM tag function of HTML and the newly developed gcc program. Applying the retrieval system, a WWW image database “Lotus in Japan” was developed. The development of such a WWW service with the retrieval function was unexpectedly simple and easy.

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A vegetable and fruits market information database ”NAPASS for Web” for World Wide Web (WWW) service has been developed. The system integrates an existing command-driven database ”NAPASS (Nationwide Agricultural products Price Analysis Support System)” and a newly developed WWW interface using FORM Tag function of HTML. Although the WWW interface for NAPASS provides an easy operation graphical user interface (GUI) with visualization of retrieved data, the development of the WWW interface was reasonably simple.
Thus most existing database such a NAPASS can be easily integrated to WWW service using the same methods described in this paper.

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