本文件建立了非液体肥料材料中单硅酸浓度的测定方法。单硅酸被称为硅（Si）。 该提取方法适用于检测非液体肥料产品、混合产品和有益物质中的一硅酸，硅（Si）浓度为2至84 g/kg，检测限（LOD）为0.6 g/kg Si，定量限（LOQ）为2 g/kg，与植物吸收密切相关。 该方法不适用于液态硅肥源，因为硅回收率的预期偏差较低，且与植物吸收的相关性较低。

This document establishes a method for the determination of monosilicic acid concentrations in nonliquid fertilizer materials. Monosilicic acid is reported as silicon (Si). This extraction method is applicable to the detection of monosilicic acid in nonliquid fertilizer products, blended products, and beneficial substances at silicon (Si) concentrations of 2 to 84 g/kg, with a limit of detection (LOD) of 0,6 g/kg Si, and a limit of quantification (LOQ) of 2 g/kg correlating well with plant uptake. This method is not applicable to liquid silicon fertilizer sources due to an expected low bias of Si recovery and low correlation with plant uptake.