Mokichi Okada believed that the land provided all the nutrients that crops needed and that soil pollution and weakness could be attributed to man and his chemicals.
岡田茂吉認為，大地本已具備培育所有作物的養分，只因人為的破壞與濫用農藥，才使土地變得貧瘠且遭受污染，因此當務之急是好好保持土壤的潔淨，給土壤一個自我療癒的機會。