Abstract: Fertilizer with a chelate element is provided which comprises 0.01 to 4 parts of a compound of a metal for forming the central metal of a chelate compound, 1 to 5 parts of an oxycarboxylic acid, 2 to 8 parts of a potassic element, 0.1 to 1 part of a nitrogenous element, and 0.01 to 2 parts of a phosphorous element by weight, indicating a pH value of 6.0 to 7.5 when mixed with water. When a living body ingests an agricultural product cultivated with the fertilizer, the chelate derives glutathione S-transferase molecular species which can catalyze the detoxicating reaction of the electrophillic compound by the S-bonded reaction of said electrophillic compound and nucleophillic reduction-type glutathione peroxidase.