Hiroyuki Horitsu

(Professor of Gifu University)

Abstract

In recent years, waste products of great and quantity are produced as the by products of activated industrial activity and elevating life level. Among these so called waste products, are some still very usable resources. Nevertheless, for reasons of inconvenience, hard to use, or not econmical, most of the waste products were thrown out. Speaking severely, the narrow country of Japan may at last be buried in waste products if there is no change. For example, it is said that up to 120 million tons of normal agricultural waste products are produced every year in Japan and 400 million tons in the U.S.A.. Accordingly, application methods for waste products of biological production systems, especially of the enormous amount of normal agricultural products, and in deep connection with it, forest waste products, animal husbandry waste products, and civil waste products will be discussed here.

Key words: agricultural waste, forest waste, animal husbandry waste