Establishment of environmentally friednly cultivation technique for rice in cold high altitude areas using compost and stable manure, (1) no chemical fertilizer system using compost and stable manure and organic fertilizer (Gifu Prefectural Research Institute for Agricultural Sciences in Hilly and Mountainous Areas S).
1. Elucidation of natural circulation functions of topographic linkage systems and development of improvement technologies. (2) Elucidations of behaviors of substances affecting environment in crop - farm land - water systems and environmental capacity of the systmes. Denitrification control by regulating underground water levels and applying organic materials and nitrate-nitrogen eluviation control.