SUGCT and infection: It has also analyzed the infection of the cut surface of sweet potatoes; the contents of the plant hormones GA-3, IPA, GA-4, ZR, IAA, DHZR, JA-ME, and BR; the activities of the plant stress enzymes CAT, MDA, SOD, and POD; the contents of the main nutrients: ascorbic acid, carotenoids, total phenol, and total flavones; and studied the antifungal effect of each nanomaterial.