PROBLEM TO BE SOLVED: To provide a plant growth auxiliary item which can sufficiently grow plants even if chemical fertilizer is not used, is safety, has high nutritive value, and is particularly used as main water for hydroponics. SOLUTION: The plant growth auxiliary item contains at least one kind among demineralized water B, a mineral concentrated liquid D and concentrated salt water E of deep sea water separated by a multi-stage ion exchange electrodialysis. The plant growth auxiliary item contains at least one or more kinds among demineralized water B, a mineral concentrated liquid D and salt concentrated water E which are separated from cold water A inherent in Japan Sea so as to be suitable for the hydroponics. The plant growth auxiliary item contains components suitable for plants which are mainly selected from demineralized water B, a mineral concentrated liquid D and salt concentrated water E separated form cold water A inherent in Japan Sea. COPYRIGHT: (C)2004,JPO
