PROBLEM TO BE SOLVED: To provide a liquid fertilizer containing a humic acid and three elements: nitrogen, phosphoric acid and potassium and a method for producing the liquid fertilizer.SOLUTION: There is provided a humic acid-containing three-elements liquid fertilizer, a pH of which is 6.5-7.5 and a content percentage of precipitation in solution at 20°C of which is 1.0 mass% or less and which contains the following components (1) to (4): (1) 1.0-3.0 mass% of the humic acid as TOC, (2) 4.0-10.5 mass% of a nitrogen component in terms of nitrogen, (3) 1.0-4.5 mass% of a phosphoric acid component in terms of phosphorous pentaoxide, and (4) 3.0-6.5 mass% of a potassium component in terms of potassium oxide.SELECTED DRAWING: None【課題】腐植酸及び、窒素、リン酸、カリウムの三要素肥料成分を含有する液体肥料とその製造方法を提供する。【解決手段】下記（１）～（４）の成分を含み、ｐＨが６．５～７．５、液温２０℃における沈殿の含有率が１．０質量％以下である腐植酸含有三要素液体肥料。（１）腐植酸がＴＯＣとして１．０～３．０質量％（２）窒素成分が窒素換算で４．０～１０．５質量％（３）リン酸成分が五酸化リン換算で１．０～４．５質量％（４）カリウム成分が酸化カリウム換算で３．０～６．５質量％【選択図】なし
