In this report, we are trying to build a prototype of a system, such as support planners in charge of land consolidation projects. With the increase of demand for land consolidation projects, it will become more necessary to make such a supporting system. For the purpose of constructing a useful system, we examined two parts of prototype system. The former is a consulting system such as to aid the parties concerned to select out a suitable institute. This one is a kind of a knowledge base system, and in this system, we attempted to use Production Systems, a method of knowledge representation in knowledge engineering. The latter is a part of a database of agricultural land. The conclusion of our trial is as follows. With regard to a part of system to which we can apply a method of knowledge representation, if we can prepare fairly enough knowledge and can arrange it in order, we will be able to construct a considerable part of useful system. It is just the same as the database construction. Concerning agricultural land data, ordinarily, there is no detailed data other than a half mesh data. That is, it is not so hard to make a supporting system, but more difficult to get enough knowledge data or basic data about a problem.

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We studied organic material flow in an urbanized area (Toride City, Ibaraki Prefecture) in 1985, and analyzed the flow and the load on the agricultural land and the environment. The population density of Toride City was 2134 persons per km2 in 1985. The proportion of the farming population to the total population was 6%. The proportion of agricultural land which was mostly occupied by paddy field was 23% of Toride City area. A few livestocks were kept in the area. The purchased food reached 98% of the total consumed food because the farming population was small, and was 96% of such purchased organic matter as food, feed and litter. A little amount of feed and litter was consumed in the area due to a few livestocks. Ninety five percent of the organic matter loaded the environment were derived from human waste. Organic material flow in Toride City was consequently characterized mainly by a large amount of purchased food and the human waste, and a little amount of recycling organic matter to the agricultural land. The amount of organic matter recycled to the agricultural land was 8.1t/ha. We estimated the amount of nitrogen mineralized from the recycled organic matter in the agricultural soil was 80kg/ha by using a model simulation describing decomposition processes of organic matter. The recycled ratio [the amount of recycled organic matter / (the amount of recycled organic matter + the amount of loading environment) x 100] was 35% in the city. Recycled ratio should be high in order to reduce the load on the environment. We estimated the amount of mineralized nitrogen to be 441kg/ha by assuming full recycling of organic matter. The amount exceeded an appropriate level of nitrogen to support a regular crop yield. It was caused by the small area of agricultural land to be used for recycling as compared with the amount of recycled organic matter in the area. A recycling system of organic matter in an urban area should be established in order to keep an agricultural land to be healthy and to reduce a load on environment.

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