PROBLEM TO BE SOLVED: To provide a silicic acid fertilizer easily and inexpensively producible, further having reduced unevenness in a component composition, excellent in uniformity, and further having a high effect of the soundness in the growth of products such as paddy even in a small amount of blending.SOLUTION: Provided is a silicic acid fertilizer obtained by mixing a silicic acid material containing a calcium silicate hydrate as the main component, being porous and also having a granular shape with a granular acid material. The acid material is, e.g., made of one or more kinds selected from sulfate, nitrate and chloride. The silicic acid material is, e.g., made of lightweight cellular concrete. The ratio of the acid material in the total content of the silicic acid material and the acid material is preferably 5 to 70 mass%.COPYRIGHT: (C)2015,JPO&INPIT【課題】容易にかつ低コストで製造することができ、また、成分組成にムラが少なく、均一性に優れており、さらに、少量の配合でも水稲等の作物の生育の健全化の効果が大きいケイ酸質肥料を提供する。【解決手段】ケイ酸カルシウム水和物を主成分として含む、多孔質でかつ粉粒状のケイ酸質材料と、粉粒状の酸性材料を混合してなるケイ酸質肥料。酸性材料は、例えば、硫酸塩、硝酸塩および塩化物から選ばれる一種以上からなる。ケイ酸質材料は、例えば、軽量気泡コンクリートからなる。ケイ酸質材料と酸性材料の合計量中の酸性材料の割合は、好ましくは5~70質量%である。【選択図】なし
