1引言根据2001年7月日本农林水产省公布的农业休耕地的调查结果表明,日本耕地面积连续减少,每年有4～5万公顷的农业用地被废耕或休耕。其主要原因是地方上有半数以上的农用耕地被放弃耕种。放弃的耕地以丘陵地区居多。在日本,农业机械化的发展十分迅猛,目前已经建立了水稻耕作 1 Introduction According to the survey of agricultural fallows released by Japan’s Ministry of Agriculture, Forestry and Fisheries in July 2001, Japan’s cultivated land has been continuously reduced. Between 45,000 and 50,000 hectares of agricultural land have been abandoned or fallow each year. The main reason is that more than half of the local farmland is abandoned for cultivation. Abandoned arable land to hilly areas. In Japan, the development of agricultural mechanization has been very rapid and rice farming has now been set up