SILICON is an element that exists in the earth's crust with more than a quarter of the total weight and is the second most abundant element in the earth's crust after oxygen. Silicon is never in free state, but in some minerals such as quartz, feldspar, amethyst, flint, mica, jasper stone, and opal. Therefore, it is part of the rocks, granite, clay, generally biological and mineral elements, which constitute the soil in which agricultural crops are grown.
Silicon is essential for many living beings developed in biological processes, structural functions, protection and control, among others. It is assimilable by living organisms, mainly in the form of organic silicon or mono silicic acid (H4SiO4).
The soil where the crops are located is mainly constituted in the form of minerals (polymer) a portion of the soil structure is rock and clay, however, silicon can not be assimilated by plants in mineral form, which absorb only the silicon in the form of silicic acid (Organic Silicon).