Silicon (also known as silica, Si) is found in high quantities in open field production but is absent in hydroponic nutritional recipes. The lack of knowledge about the role of silicon (Si) in horticultural crops became apparent when using soilless / hydroponic systems.
Research has demonstrated that silicon is one of the most beneficial micro-elements for several plants. However, its role has not been considered as essential in plant nutrition. For this reason Si is not used as a common ingredient in hydroponic recipes. It is the aim of the present article to share the knowledge generated around the role of Si in plant nutrition in order to discuss its possible important function in nutrient recipes.