据国外试验,水稻施用硅肥,每亩增产率约为5-13％。水稻成熟期的茎、叶中,含硅量占干物质的10-20％,为其含氮量的十多倍。硅肥的主要作用是:①被水稻吸收的硅酸,蓄积在叶片、叶鞘、茎、根等表皮细胞的角质层内,以叶片中最多为15-30%。叶片表皮细胞壁上,有一层二氧化硅层,可减少水分蒸发和免受真菌菌丝的入侵。②提高稻根的氧化能力。③促进水稻对磷的吸收. According to foreign experiments, the application of silicon fertilizer, rice yield per mu is about 5-13%. Stems and leaves of mature rice, the silicon content of 10-20% of dry matter, more than ten times its nitrogen content. Silica fertilizer’s main role is: ① absorbed by the rice silicate, accumulated in the leaves, leaf sheaths, stems, roots and other cuticle of epidermal cells, up to 15-30% of the leaves. On the cell wall of the leaf epidermis, there is a layer of silica that reduces the evaporation of water and the intrusion of fungal mycelium. ② improve rice root oxidation ability. ③ promote rice’s absorption of phosphorus.