COMPOSITE FERTILIZER, LIQUID FERTILIZER, AND HYDROPONIC PLANT CULTURE METHOD

摘要

PROBLEM TO BE SOLVED: To provide a composite fertilizer which, when applied to hydroponic culture as a culture solution, does not choke the aperture of a tube. SOLUTION: This composite fertilizer is manufactured by containing 1-20 wt.% phosphoric acid as the large constituent 0.2-5 wt.%, EDTA iron salt as the small constituent and 0.1 wt.% or more of an EDTA compound, excluding the EDTA iron salt.