Additionally, it can be said that thinking on the mounds of wara zuka (a mound for rice straw) and mikkyo zuka (esoteric Buddhism mound) stacking straw bits and even ashes, caused the conversion of the straw bits, ashes and human wastes into fertilizers and put them into distribution to partly contribute to the development of grain-growing region related to economic growth and food culture of soybeans as well as to the development of grain farming.
また、藁塚や密教塚のように藁屑や焼却灰まで集積した塚などの思想が、藁屑や焼却灰や下肥などを肥料にし流通に乗せ、経済振興と大豆食文化などに繋がる穀倉地や、穀物農耕の隆盛の一端を担ったともいえる。