This red soil runoff preventive method is characterized by having a process of laying a water absorptive and ventilating sheet on soil including red soil and a process of spraying a nodulizing agent. 赤土を含んだ土壌に吸水性及び通気性のシートを敷設する工程と、団粒化剤を散布する工程とを有することを特徴とする赤土流出防止方法。 - 特許庁